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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2108.06293">arXiv:2108.06293</a> <span> [<a href="https://arxiv.org/pdf/2108.06293">pdf</a>, <a href="https://arxiv.org/format/2108.06293">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/JHEP03(2022)055">10.1007/JHEP03(2022)055 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Combined sensitivity of JUNO and KM3NeT/ORCA to the neutrino mass ordering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=KM3NeT+Collaboration"> KM3NeT Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Aiello%2C+S">S. Aiello</a>, <a href="/search/hep-ex?searchtype=author&query=Albert%2C+A">A. Albert</a>, <a href="/search/hep-ex?searchtype=author&query=Alshamsi%2C+M">M. Alshamsi</a>, <a href="/search/hep-ex?searchtype=author&query=Garre%2C+S+A">S. Alves Garre</a>, <a href="/search/hep-ex?searchtype=author&query=Aly%2C+Z">Z. Aly</a>, <a href="/search/hep-ex?searchtype=author&query=Ambrosone%2C+A">A. Ambrosone</a>, <a href="/search/hep-ex?searchtype=author&query=Ameli%2C+F">F. Ameli</a>, <a href="/search/hep-ex?searchtype=author&query=Andre%2C+M">M. Andre</a>, <a href="/search/hep-ex?searchtype=author&query=Androulakis%2C+G">G. Androulakis</a>, <a href="/search/hep-ex?searchtype=author&query=Anghinolfi%2C+M">M. Anghinolfi</a>, <a href="/search/hep-ex?searchtype=author&query=Anguita%2C+M">M. Anguita</a>, <a href="/search/hep-ex?searchtype=author&query=Ardid%2C+M">M. Ardid</a>, <a href="/search/hep-ex?searchtype=author&query=Ardid%2C+S">S. Ardid</a>, <a href="/search/hep-ex?searchtype=author&query=Aublin%2C+J">J. Aublin</a>, <a href="/search/hep-ex?searchtype=author&query=Bagatelas%2C+C">C. Bagatelas</a>, <a href="/search/hep-ex?searchtype=author&query=Baret%2C+B">B. Baret</a>, <a href="/search/hep-ex?searchtype=author&query=Pree%2C+S+B+d">S. Basegmez du Pree</a>, <a href="/search/hep-ex?searchtype=author&query=Bendahman%2C+M">M. Bendahman</a>, <a href="/search/hep-ex?searchtype=author&query=Benfenati%2C+F">F. Benfenati</a>, <a href="/search/hep-ex?searchtype=author&query=Berbee%2C+E">E. Berbee</a>, <a href="/search/hep-ex?searchtype=author&query=Berg%2C+A+M+v+d">A. M. van den Berg</a>, <a href="/search/hep-ex?searchtype=author&query=Bertin%2C+V">V. Bertin</a>, <a href="/search/hep-ex?searchtype=author&query=Biagi%2C+S">S. Biagi</a>, <a href="/search/hep-ex?searchtype=author&query=Boettcher%2C+M">M. Boettcher</a> , et al. (253 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2108.06293v1-abstract-short" style="display: inline;"> This article presents the potential of a combined analysis of the JUNO and KM3NeT/ORCA experiments to determine the neutrino mass ordering. This combination is particularly interesting as it significantly boosts the potential of either detector, beyond simply adding their neutrino mass ordering sensitivities, by removing a degeneracy in the determination of $螖m_{31}^2$ between the two experiments… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.06293v1-abstract-full').style.display = 'inline'; document.getElementById('2108.06293v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2108.06293v1-abstract-full" style="display: none;"> This article presents the potential of a combined analysis of the JUNO and KM3NeT/ORCA experiments to determine the neutrino mass ordering. This combination is particularly interesting as it significantly boosts the potential of either detector, beyond simply adding their neutrino mass ordering sensitivities, by removing a degeneracy in the determination of $螖m_{31}^2$ between the two experiments when assuming the wrong ordering. The study is based on the latest projected performances for JUNO, and on simulation tools using a full Monte Carlo approach to the KM3NeT/ORCA response with a careful assessment of its energy systematics. From this analysis, a $5蟽$ determination of the neutrino mass ordering is expected after 6 years of joint data taking for any value of the oscillation parameters. This sensitivity would be achieved after only 2 years of joint data taking assuming the current global best-fit values for those parameters for normal ordering. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.06293v1-abstract-full').style.display = 'none'; document.getElementById('2108.06293v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 August, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">24 pages, 9 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> JHEP 03 (2022) 055 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2107.00344">arXiv:2107.00344</a> <span> [<a href="https://arxiv.org/pdf/2107.00344">pdf</a>, <a href="https://arxiv.org/format/2107.00344">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Sensitivity to light sterile neutrino mixing parameters with KM3NeT/ORCA </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Aiello%2C+S">S. Aiello</a>, <a href="/search/hep-ex?searchtype=author&query=Albert%2C+A">A. Albert</a>, <a href="/search/hep-ex?searchtype=author&query=Alshamsi%2C+M">M. Alshamsi</a>, <a href="/search/hep-ex?searchtype=author&query=Garre%2C+S+A">S. Alves Garre</a>, <a href="/search/hep-ex?searchtype=author&query=Aly%2C+Z">Z. Aly</a>, <a href="/search/hep-ex?searchtype=author&query=Ambrosone%2C+A">A. Ambrosone</a>, <a href="/search/hep-ex?searchtype=author&query=Ameli%2C+F">F. Ameli</a>, <a href="/search/hep-ex?searchtype=author&query=Andre%2C+M">M. Andre</a>, <a href="/search/hep-ex?searchtype=author&query=Androulakis%2C+G">G. Androulakis</a>, <a href="/search/hep-ex?searchtype=author&query=Anghinolfi%2C+M">M. Anghinolfi</a>, <a href="/search/hep-ex?searchtype=author&query=Anguita%2C+M">M. Anguita</a>, <a href="/search/hep-ex?searchtype=author&query=Anton%2C+G">G. Anton</a>, <a href="/search/hep-ex?searchtype=author&query=Ardid%2C+M">M. Ardid</a>, <a href="/search/hep-ex?searchtype=author&query=Ardid%2C+S">S. Ardid</a>, <a href="/search/hep-ex?searchtype=author&query=Aublin%2C+J">J. Aublin</a>, <a href="/search/hep-ex?searchtype=author&query=Bagatelas%2C+C">C. Bagatelas</a>, <a href="/search/hep-ex?searchtype=author&query=Baret%2C+B">B. Baret</a>, <a href="/search/hep-ex?searchtype=author&query=Pree%2C+S+B+d">S. Basegmez du Pree</a>, <a href="/search/hep-ex?searchtype=author&query=Bendahman%2C+M">M. Bendahman</a>, <a href="/search/hep-ex?searchtype=author&query=Benfenati%2C+F">F. Benfenati</a>, <a href="/search/hep-ex?searchtype=author&query=Berbee%2C+E">E. Berbee</a>, <a href="/search/hep-ex?searchtype=author&query=Berg%2C+A+M+v+d">A. M. van den Berg</a>, <a href="/search/hep-ex?searchtype=author&query=Bertin%2C+V">V. Bertin</a>, <a href="/search/hep-ex?searchtype=author&query=Biagi%2C+S">S. Biagi</a>, <a href="/search/hep-ex?searchtype=author&query=Bissinger%2C+M">M. Bissinger</a> , et al. (223 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2107.00344v2-abstract-short" style="display: inline;"> KM3NeT/ORCA is a next-generation neutrino telescope optimised for atmospheric neutrino oscillations studies. In this paper, the sensitivity of ORCA to the presence of a light sterile neutrino in a 3+1 model is presented. After three years of data taking, ORCA will be able to probe the active-sterile mixing angles $胃_{14}$, $胃_{24}$, $胃_{34}$ and the effective angle $胃_{渭e}$, over a broad range of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.00344v2-abstract-full').style.display = 'inline'; document.getElementById('2107.00344v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2107.00344v2-abstract-full" style="display: none;"> KM3NeT/ORCA is a next-generation neutrino telescope optimised for atmospheric neutrino oscillations studies. In this paper, the sensitivity of ORCA to the presence of a light sterile neutrino in a 3+1 model is presented. After three years of data taking, ORCA will be able to probe the active-sterile mixing angles $胃_{14}$, $胃_{24}$, $胃_{34}$ and the effective angle $胃_{渭e}$, over a broad range of mass squared difference $螖m^2_{41} \sim [10^{-5}, 10]$ $\rm{eV}^2$, allowing to test the eV-mass sterile neutrino hypothesis as the origin of short baseline anomalies, as well as probing the hypothesis of a very light sterile neutrino, not yet constrained by cosmology. ORCA will be able to explore a relevant fraction of the parameter space not yet reached by present measurements. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.00344v2-abstract-full').style.display = 'none'; document.getElementById('2107.00344v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 November, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2103.09885">arXiv:2103.09885</a> <span> [<a href="https://arxiv.org/pdf/2103.09885">pdf</a>, <a href="https://arxiv.org/format/2103.09885">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjc/s10052-021-09893-0">10.1140/epjc/s10052-021-09893-0 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Determining the Neutrino Mass Ordering and Oscillation Parameters with KM3NeT/ORCA </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Aiello%2C+S">S. Aiello</a>, <a href="/search/hep-ex?searchtype=author&query=Albert%2C+A">A. Albert</a>, <a href="/search/hep-ex?searchtype=author&query=Garre%2C+S+A">S. Alves Garre</a>, <a href="/search/hep-ex?searchtype=author&query=Aly%2C+Z">Z. Aly</a>, <a href="/search/hep-ex?searchtype=author&query=Ambrosone%2C+A">A. Ambrosone</a>, <a href="/search/hep-ex?searchtype=author&query=Ameli%2C+F">F. Ameli</a>, <a href="/search/hep-ex?searchtype=author&query=Andre%2C+M">M. Andre</a>, <a href="/search/hep-ex?searchtype=author&query=Androulakis%2C+G">G. Androulakis</a>, <a href="/search/hep-ex?searchtype=author&query=Anghinolfi%2C+M">M. Anghinolfi</a>, <a href="/search/hep-ex?searchtype=author&query=Anguita%2C+M">M. Anguita</a>, <a href="/search/hep-ex?searchtype=author&query=Anton%2C+G">G. Anton</a>, <a href="/search/hep-ex?searchtype=author&query=Ardid%2C+M">M. Ardid</a>, <a href="/search/hep-ex?searchtype=author&query=Ardid%2C+S">S. Ardid</a>, <a href="/search/hep-ex?searchtype=author&query=Aublin%2C+J">J. Aublin</a>, <a href="/search/hep-ex?searchtype=author&query=Bagatelas%2C+C">C. Bagatelas</a>, <a href="/search/hep-ex?searchtype=author&query=Baret%2C+B">B. Baret</a>, <a href="/search/hep-ex?searchtype=author&query=Pree%2C+S+B+d">S. Basegmez du Pree</a>, <a href="/search/hep-ex?searchtype=author&query=Bendahman%2C+M">M. Bendahman</a>, <a href="/search/hep-ex?searchtype=author&query=Benfenati%2C+F">F. Benfenati</a>, <a href="/search/hep-ex?searchtype=author&query=Berbee%2C+E">E. Berbee</a>, <a href="/search/hep-ex?searchtype=author&query=Berg%2C+A+M+v+d">A. M. van den Berg</a>, <a href="/search/hep-ex?searchtype=author&query=Bertin%2C+V">V. Bertin</a>, <a href="/search/hep-ex?searchtype=author&query=Biagi%2C+S">S. Biagi</a>, <a href="/search/hep-ex?searchtype=author&query=Bissinger%2C+M">M. Bissinger</a>, <a href="/search/hep-ex?searchtype=author&query=Boettcher%2C+M">M. Boettcher</a> , et al. (217 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2103.09885v2-abstract-short" style="display: inline;"> The next generation of water Cherenkov neutrino telescopes in the Mediterranean Sea are under construction offshore France (KM3NeT/ORCA) and Sicily (KM3NeT/ARCA). The KM3NeT/ORCA detector features an energy detection threshold which allows to collect atmospheric neutrinos to study flavour oscillation. This paper reports the KM3NeT/ORCA sensitivity to this phenomenon. The event reconstruction, sele… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.09885v2-abstract-full').style.display = 'inline'; document.getElementById('2103.09885v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2103.09885v2-abstract-full" style="display: none;"> The next generation of water Cherenkov neutrino telescopes in the Mediterranean Sea are under construction offshore France (KM3NeT/ORCA) and Sicily (KM3NeT/ARCA). The KM3NeT/ORCA detector features an energy detection threshold which allows to collect atmospheric neutrinos to study flavour oscillation. This paper reports the KM3NeT/ORCA sensitivity to this phenomenon. The event reconstruction, selection and classification are described. The sensitivity to determine the neutrino mass ordering was evaluated and found to be 4.4 $蟽$ if the true ordering is normal and 2.3 $蟽$ if inverted, after three years of data taking. The precision to measure $螖m^2_{32}$ and $胃_{23}$ were also estimated and found to be $85\cdot10^{-6}$ eV$^2$ and $(^{+1.9}_{-3.1})^{\circ}$ for normal neutrino mass ordering and, $75\cdot10^{-6}$ eV$^2$ and $(^{+2.0}_{-7.0})^{\circ}$ for inverted ordering. Finally, a unitarity test of the leptonic mixing matrix by measuring the rate of tau neutrinos is described. Three years of data taking were found to be sufficient to exclude $谓_蟿$ and $\bar谓_蟿$ event rate variations larger than 20% at $3蟽$ level. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.09885v2-abstract-full').style.display = 'none'; document.getElementById('2103.09885v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 November, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Accepted for publication at EPJ-C</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C 82, 26 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1910.00112">arXiv:1910.00112</a> <span> [<a href="https://arxiv.org/pdf/1910.00112">pdf</a>, <a href="https://arxiv.org/format/1910.00112">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.cpc.2020.107433">10.1016/j.cpc.2020.107433 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Control Unit of the KM3NeT Data Acquisition System </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Aiello%2C+S">S. Aiello</a>, <a href="/search/hep-ex?searchtype=author&query=Ameli%2C+F">F. Ameli</a>, <a href="/search/hep-ex?searchtype=author&query=Andre%2C+M">M. Andre</a>, <a href="/search/hep-ex?searchtype=author&query=Androulakis%2C+G">G. Androulakis</a>, <a href="/search/hep-ex?searchtype=author&query=Anghinolfi%2C+M">M. Anghinolfi</a>, <a href="/search/hep-ex?searchtype=author&query=Anton%2C+G">G. Anton</a>, <a href="/search/hep-ex?searchtype=author&query=Ardid%2C+M">M. Ardid</a>, <a href="/search/hep-ex?searchtype=author&query=Aublin%2C+J">J. Aublin</a>, <a href="/search/hep-ex?searchtype=author&query=Bagatelas%2C+C">C. Bagatelas</a>, <a href="/search/hep-ex?searchtype=author&query=Barbarino%2C+G">G. Barbarino</a>, <a href="/search/hep-ex?searchtype=author&query=Baret%2C+B">B. Baret</a>, <a href="/search/hep-ex?searchtype=author&query=Pree%2C+S+B+d">S. Basegmez du Pree</a>, <a href="/search/hep-ex?searchtype=author&query=Bendahman%2C+M">M. Bendahman</a>, <a href="/search/hep-ex?searchtype=author&query=Berbee%2C+E">E. Berbee</a>, <a href="/search/hep-ex?searchtype=author&query=Berg%2C+A+M+v+d">A. M. van den Berg</a>, <a href="/search/hep-ex?searchtype=author&query=Bertin%2C+V">V. Bertin</a>, <a href="/search/hep-ex?searchtype=author&query=Biagi%2C+S">S. Biagi</a>, <a href="/search/hep-ex?searchtype=author&query=Biagioni%2C+A">A. Biagioni</a>, <a href="/search/hep-ex?searchtype=author&query=Bissinger%2C+M">M. Bissinger</a>, <a href="/search/hep-ex?searchtype=author&query=Boumaaza%2C+J">J. Boumaaza</a>, <a href="/search/hep-ex?searchtype=author&query=Bourret%2C+S">S. Bourret</a>, <a href="/search/hep-ex?searchtype=author&query=Bouta%2C+M">M. Bouta</a>, <a href="/search/hep-ex?searchtype=author&query=Bouvet%2C+G">G. Bouvet</a>, <a href="/search/hep-ex?searchtype=author&query=Bouwhuis%2C+M">M. Bouwhuis</a>, <a href="/search/hep-ex?searchtype=author&query=Bozza%2C+C">C. Bozza</a> , et al. (195 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1910.00112v1-abstract-short" style="display: inline;"> The KM3NeT Collaboration runs a multi-site neutrino observatory in the Mediterranean Sea. Water Cherenkov particle detectors, deep in the sea and far off the coasts of France and Italy, are already taking data while incremental construction progresses. Data Acquisition Control software is operating off-shore detectors as well as testing and qualification stations for their components. The software… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.00112v1-abstract-full').style.display = 'inline'; document.getElementById('1910.00112v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1910.00112v1-abstract-full" style="display: none;"> The KM3NeT Collaboration runs a multi-site neutrino observatory in the Mediterranean Sea. Water Cherenkov particle detectors, deep in the sea and far off the coasts of France and Italy, are already taking data while incremental construction progresses. Data Acquisition Control software is operating off-shore detectors as well as testing and qualification stations for their components. The software, named Control Unit, is highly modular. It can undergo upgrades and reconfiguration with the acquisition running. Interplay with the central database of the Collaboration is obtained in a way that allows for data taking even if Internet links fail. In order to simplify the management of computing resources in the long term, and to cope with possible hardware failures of one or more computers, the KM3NeT Control Unit software features a custom dynamic resource provisioning and failover technology, which is especially important for ensuring continuity in case of rare transient events in multi-messenger astronomy. The software architecture relies on ubiquitous tools and broadly adopted technologies and has been successfully tested on several operating systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.00112v1-abstract-full').style.display = 'none'; document.getElementById('1910.00112v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1906.02704">arXiv:1906.02704</a> <span> [<a href="https://arxiv.org/pdf/1906.02704">pdf</a>, <a href="https://arxiv.org/format/1906.02704">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjc/s10052-020-7629-z">10.1140/epjc/s10052-020-7629-z <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Dependence of atmospheric muon flux on seawater depth measured with the first KM3NeT detection units </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=KM3NeT+Collaboration"> KM3NeT Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Ageron%2C+M">M. Ageron</a>, <a href="/search/hep-ex?searchtype=author&query=Aiello%2C+S">S. Aiello</a>, <a href="/search/hep-ex?searchtype=author&query=Ameli%2C+F">F. Ameli</a>, <a href="/search/hep-ex?searchtype=author&query=Andre%2C+M">M. Andre</a>, <a href="/search/hep-ex?searchtype=author&query=Androulakis%2C+G">G. Androulakis</a>, <a href="/search/hep-ex?searchtype=author&query=Anghinolfi%2C+M">M. Anghinolfi</a>, <a href="/search/hep-ex?searchtype=author&query=Anton%2C+G">G. Anton</a>, <a href="/search/hep-ex?searchtype=author&query=Ardid%2C+M">M. Ardid</a>, <a href="/search/hep-ex?searchtype=author&query=Aublin%2C+J">J. Aublin</a>, <a href="/search/hep-ex?searchtype=author&query=Bagatelas%2C+C">C. Bagatelas</a>, <a href="/search/hep-ex?searchtype=author&query=Barbarino%2C+G">G. Barbarino</a>, <a href="/search/hep-ex?searchtype=author&query=Baret%2C+B">B. Baret</a>, <a href="/search/hep-ex?searchtype=author&query=Pree%2C+S+B+d">S. Basegmez du Pree</a>, <a href="/search/hep-ex?searchtype=author&query=Belias%2C+A">A. Belias</a>, <a href="/search/hep-ex?searchtype=author&query=Berbee%2C+E">E. Berbee</a>, <a href="/search/hep-ex?searchtype=author&query=Berg%2C+A+M+v+d">A. M. van den Berg</a>, <a href="/search/hep-ex?searchtype=author&query=Bertin%2C+V">V. Bertin</a>, <a href="/search/hep-ex?searchtype=author&query=van+Beveren%2C+V">V. van Beveren</a>, <a href="/search/hep-ex?searchtype=author&query=Biagi%2C+S">S. Biagi</a>, <a href="/search/hep-ex?searchtype=author&query=Biagioni%2C+A">A. Biagioni</a>, <a href="/search/hep-ex?searchtype=author&query=Bianucci%2C+S">S. Bianucci</a>, <a href="/search/hep-ex?searchtype=author&query=Billault%2C+M">M. Billault</a>, <a href="/search/hep-ex?searchtype=author&query=Bissinger%2C+M">M. Bissinger</a>, <a href="/search/hep-ex?searchtype=author&query=de+Boer%2C+R">R. de Boer</a> , et al. (240 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1906.02704v3-abstract-short" style="display: inline;"> KM3NeT is a research infrastructure located in the Mediterranean Sea, that will consist of two deep-sea Cherenkov neutrino detectors. With one detector (ARCA), the KM3NeT Collaboration aims at identifying and studying TeV-PeV astrophysical neutrino sources. With the other detector (ORCA), the neutrino mass ordering will be determined by studying GeV-scale atmospheric neutrino oscillations. The fir… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1906.02704v3-abstract-full').style.display = 'inline'; document.getElementById('1906.02704v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1906.02704v3-abstract-full" style="display: none;"> KM3NeT is a research infrastructure located in the Mediterranean Sea, that will consist of two deep-sea Cherenkov neutrino detectors. With one detector (ARCA), the KM3NeT Collaboration aims at identifying and studying TeV-PeV astrophysical neutrino sources. With the other detector (ORCA), the neutrino mass ordering will be determined by studying GeV-scale atmospheric neutrino oscillations. The first KM3NeT detection units were deployed at the Italian and French sites between 2015 and 2017. In this paper, a description of the detector is presented, together with a summary of the procedures used to calibrate the detector in-situ. Finally, the measurement of the atmospheric muon flux between 2232-3386 m seawater depth is obtained. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1906.02704v3-abstract-full').style.display = 'none'; document.getElementById('1906.02704v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 February, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 June, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages, 9 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C 80, 99 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1806.05386">arXiv:1806.05386</a> <span> [<a href="https://arxiv.org/pdf/1806.05386">pdf</a>, <a href="https://arxiv.org/format/1806.05386">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1475-7516/2018/10/026">10.1088/1475-7516/2018/10/026 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Observation of inclined EeV air showers with the radio detector of the Pierre Auger Observatory </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=The+Pierre+Auger+Collaboration"> The Pierre Auger Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Aab%2C+A">A. Aab</a>, <a href="/search/hep-ex?searchtype=author&query=Abreu%2C+P">P. Abreu</a>, <a href="/search/hep-ex?searchtype=author&query=Aglietta%2C+M">M. Aglietta</a>, <a href="/search/hep-ex?searchtype=author&query=Albuquerque%2C+I+F+M">I. F. M. Albuquerque</a>, <a href="/search/hep-ex?searchtype=author&query=Albury%2C+J+M">J. M. Albury</a>, <a href="/search/hep-ex?searchtype=author&query=Allekotte%2C+I">I. Allekotte</a>, <a href="/search/hep-ex?searchtype=author&query=Almela%2C+A">A. Almela</a>, <a href="/search/hep-ex?searchtype=author&query=Castillo%2C+J+A">J. Alvarez Castillo</a>, <a href="/search/hep-ex?searchtype=author&query=Alvarez-Mu%C3%B1iz%2C+J">J. Alvarez-Mu帽iz</a>, <a href="/search/hep-ex?searchtype=author&query=Anastasi%2C+G+A">G. A. Anastasi</a>, <a href="/search/hep-ex?searchtype=author&query=Anchordoqui%2C+L">L. Anchordoqui</a>, <a href="/search/hep-ex?searchtype=author&query=Andrada%2C+B">B. Andrada</a>, <a href="/search/hep-ex?searchtype=author&query=Andringa%2C+S">S. Andringa</a>, <a href="/search/hep-ex?searchtype=author&query=Aramo%2C+C">C. Aramo</a>, <a href="/search/hep-ex?searchtype=author&query=Arsene%2C+N">N. Arsene</a>, <a href="/search/hep-ex?searchtype=author&query=Asorey%2C+H">H. Asorey</a>, <a href="/search/hep-ex?searchtype=author&query=Assis%2C+P">P. Assis</a>, <a href="/search/hep-ex?searchtype=author&query=Avila%2C+G">G. Avila</a>, <a href="/search/hep-ex?searchtype=author&query=Badescu%2C+A+M">A. M. Badescu</a>, <a href="/search/hep-ex?searchtype=author&query=Balaceanu%2C+A">A. Balaceanu</a>, <a href="/search/hep-ex?searchtype=author&query=Barbato%2C+F">F. Barbato</a>, <a href="/search/hep-ex?searchtype=author&query=Luz%2C+R+J+B">R. J. Barreira Luz</a>, <a href="/search/hep-ex?searchtype=author&query=Baur%2C+S">S. Baur</a>, <a href="/search/hep-ex?searchtype=author&query=Becker%2C+K+H">K. H. Becker</a> , et al. (370 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1806.05386v2-abstract-short" style="display: inline;"> With the Auger Engineering Radio Array (AERA) of the Pierre Auger Observatory, we have observed the radio emission from 561 extensive air showers with zenith angles between 60$^\circ$ and 84$^\circ$. In contrast to air showers with more vertical incidence, these inclined air showers illuminate large ground areas of several km$^2$ with radio signals detectable in the 30 to 80\,MHz band. A compariso… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.05386v2-abstract-full').style.display = 'inline'; document.getElementById('1806.05386v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1806.05386v2-abstract-full" style="display: none;"> With the Auger Engineering Radio Array (AERA) of the Pierre Auger Observatory, we have observed the radio emission from 561 extensive air showers with zenith angles between 60$^\circ$ and 84$^\circ$. In contrast to air showers with more vertical incidence, these inclined air showers illuminate large ground areas of several km$^2$ with radio signals detectable in the 30 to 80\,MHz band. A comparison of the measured radio-signal amplitudes with Monte Carlo simulations of a subset of 50 events for which we reconstruct the energy using the Auger surface detector shows agreement within the uncertainties of the current analysis. As expected for forward-beamed radio emission undergoing no significant absorption or scattering in the atmosphere, the area illuminated by radio signals grows with the zenith angle of the air shower. Inclined air showers with EeV energies are thus measurable with sparse radio-antenna arrays with grid sizes of a km or more. This is particularly attractive as radio detection provides direct access to the energy in the electromagnetic cascade of an air shower, which in case of inclined air showers is not accessible by arrays of particle detectors on the ground. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.05386v2-abstract-full').style.display = 'none'; document.getElementById('1806.05386v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 October, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 June, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Published version, 14 pages, 12 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-PUB-18-259 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> JCAP10(2018)026 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1612.01517">arXiv:1612.01517</a> <span> [<a href="https://arxiv.org/pdf/1612.01517">pdf</a>, <a href="https://arxiv.org/format/1612.01517">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1475-7516/2017/04/009;">10.1088/1475-7516/2017/04/009; <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1475-7516/2020/09/E02">10.1088/1475-7516/2020/09/E02 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for photons with energies above 10$^{18}$ eV using the hybrid detector of the Pierre Auger Observatory </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=The+Pierre+Auger+Collaboration"> The Pierre Auger Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Aab%2C+A">A. Aab</a>, <a href="/search/hep-ex?searchtype=author&query=Abreu%2C+P">P. Abreu</a>, <a href="/search/hep-ex?searchtype=author&query=Aglietta%2C+M">M. Aglietta</a>, <a href="/search/hep-ex?searchtype=author&query=Samarai%2C+I+A">I. Al Samarai</a>, <a href="/search/hep-ex?searchtype=author&query=Albuquerque%2C+I+F+M">I. F. M. Albuquerque</a>, <a href="/search/hep-ex?searchtype=author&query=Allekotte%2C+I">I. Allekotte</a>, <a href="/search/hep-ex?searchtype=author&query=Almela%2C+A">A. Almela</a>, <a href="/search/hep-ex?searchtype=author&query=Castillo%2C+J+A">J. Alvarez Castillo</a>, <a href="/search/hep-ex?searchtype=author&query=Alvarez-Mu%C3%B1iz%2C+J">J. Alvarez-Mu帽iz</a>, <a href="/search/hep-ex?searchtype=author&query=Anastasi%2C+G+A">G. A. Anastasi</a>, <a href="/search/hep-ex?searchtype=author&query=Anchordoqui%2C+L">L. Anchordoqui</a>, <a href="/search/hep-ex?searchtype=author&query=Andrada%2C+B">B. Andrada</a>, <a href="/search/hep-ex?searchtype=author&query=Andringa%2C+S">S. Andringa</a>, <a href="/search/hep-ex?searchtype=author&query=Aramo%2C+C">C. Aramo</a>, <a href="/search/hep-ex?searchtype=author&query=Arqueros%2C+F">F. Arqueros</a>, <a href="/search/hep-ex?searchtype=author&query=Arsene%2C+N">N. Arsene</a>, <a href="/search/hep-ex?searchtype=author&query=Asorey%2C+H">H. Asorey</a>, <a href="/search/hep-ex?searchtype=author&query=Assis%2C+P">P. Assis</a>, <a href="/search/hep-ex?searchtype=author&query=Aublin%2C+J">J. Aublin</a>, <a href="/search/hep-ex?searchtype=author&query=Avila%2C+G">G. Avila</a>, <a href="/search/hep-ex?searchtype=author&query=Badescu%2C+A+M">A. M. Badescu</a>, <a href="/search/hep-ex?searchtype=author&query=Balaceanu%2C+A">A. Balaceanu</a>, <a href="/search/hep-ex?searchtype=author&query=Luz%2C+R+J+B">R. J. Barreira Luz</a>, <a href="/search/hep-ex?searchtype=author&query=Beatty%2C+J+J">J. J. Beatty</a> , et al. (375 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1612.01517v3-abstract-short" style="display: inline;"> A search for ultra-high energy photons with energies above 1 EeV is performed using nine years of data collected by the Pierre Auger Observatory in hybrid operation mode. An unprecedented separation power between photon and hadron primaries is achieved by combining measurements of the longitudinal air-shower development with the particle content at ground measured by the fluorescence and surface d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1612.01517v3-abstract-full').style.display = 'inline'; document.getElementById('1612.01517v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1612.01517v3-abstract-full" style="display: none;"> A search for ultra-high energy photons with energies above 1 EeV is performed using nine years of data collected by the Pierre Auger Observatory in hybrid operation mode. An unprecedented separation power between photon and hadron primaries is achieved by combining measurements of the longitudinal air-shower development with the particle content at ground measured by the fluorescence and surface detectors, respectively. Only three photon candidates at energies 1 - 2 EeV are found, which is compatible with the expected hadron-induced background. Upper limits on the integral flux of ultra-high energy photons of 0.038, 0.010, 0.009, 0.008 and 0.007 km$^{-2}$ sr$^{-1}$ yr$^{-1}$ are derived at 95% C.L. for energy thresholds of 1, 2, 3, 5 and 10 EeV. These limits bound the fractions of photons in the all-particle integral flux below 0.14%, 0.17%, 0.42%, 0.86% and 2.9%. For the first time the photon fraction at EeV energies is constrained at the sub-percent level. The improved limits are below the flux of diffuse photons predicted by some astrophysical scenarios for cosmogenic photon production. The new results rule-out the early top-down models $-$ in which ultra-high energy cosmic rays are produced by, e.g., the decay of super-massive particles $-$ and challenge the most recent super-heavy dark matter models. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1612.01517v3-abstract-full').style.display = 'none'; document.getElementById('1612.01517v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 December, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Corrected version after erratum published in JCAP</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-PUB-16-657 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> JCAP04(2017)009; JCAP09(2020)E02 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1610.08509">arXiv:1610.08509</a> <span> [<a href="https://arxiv.org/pdf/1610.08509">pdf</a>, <a href="https://arxiv.org/format/1610.08509">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.117.192001">10.1103/PhysRevLett.117.192001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Testing Hadronic Interactions at Ultrahigh Energies with Air Showers Measured by the Pierre Auger Observatory </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=The+Pierre+Auger+Collaboration"> The Pierre Auger Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Aab%2C+A">A. Aab</a>, <a href="/search/hep-ex?searchtype=author&query=Abreu%2C+P">P. Abreu</a>, <a href="/search/hep-ex?searchtype=author&query=Aglietta%2C+M">M. Aglietta</a>, <a href="/search/hep-ex?searchtype=author&query=Ahn%2C+E+J">E. J. Ahn</a>, <a href="/search/hep-ex?searchtype=author&query=Samarai%2C+I+A">I. Al Samarai</a>, <a href="/search/hep-ex?searchtype=author&query=Albuquerque%2C+I+F+M">I. F. M. Albuquerque</a>, <a href="/search/hep-ex?searchtype=author&query=Allekotte%2C+I">I. Allekotte</a>, <a href="/search/hep-ex?searchtype=author&query=Allen%2C+J">J. Allen</a>, <a href="/search/hep-ex?searchtype=author&query=Allison%2C+P">P. Allison</a>, <a href="/search/hep-ex?searchtype=author&query=Almela%2C+A">A. Almela</a>, <a href="/search/hep-ex?searchtype=author&query=Castillo%2C+J+A">J. Alvarez Castillo</a>, <a href="/search/hep-ex?searchtype=author&query=Alvarez-Mu%C3%B1iz%2C+J">J. Alvarez-Mu帽iz</a>, <a href="/search/hep-ex?searchtype=author&query=Ambrosio%2C+M">M. Ambrosio</a>, <a href="/search/hep-ex?searchtype=author&query=Anastasi%2C+G+A">G. A. Anastasi</a>, <a href="/search/hep-ex?searchtype=author&query=Anchordoqui%2C+L">L. Anchordoqui</a>, <a href="/search/hep-ex?searchtype=author&query=Andrada%2C+B">B. Andrada</a>, <a href="/search/hep-ex?searchtype=author&query=Andringa%2C+S">S. Andringa</a>, <a href="/search/hep-ex?searchtype=author&query=Aramo%2C+C">C. Aramo</a>, <a href="/search/hep-ex?searchtype=author&query=Arqueros%2C+F">F. Arqueros</a>, <a href="/search/hep-ex?searchtype=author&query=Arsene%2C+N">N. Arsene</a>, <a href="/search/hep-ex?searchtype=author&query=Asorey%2C+H">H. Asorey</a>, <a href="/search/hep-ex?searchtype=author&query=Assis%2C+P">P. Assis</a>, <a href="/search/hep-ex?searchtype=author&query=Aublin%2C+J">J. Aublin</a>, <a href="/search/hep-ex?searchtype=author&query=Avila%2C+G">G. Avila</a> , et al. (413 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1610.08509v2-abstract-short" style="display: inline;"> Ultrahigh energy cosmic ray air showers probe particle physics at energies beyond the reach of accelerators. Here we introduce a new method to test hadronic interaction models without relying on the absolute energy calibration, and apply it to events with primary energy 6-16 EeV (E_CM = 110-170 TeV), whose longitudinal development and lateral distribution were simultaneously measured by the Pierre… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.08509v2-abstract-full').style.display = 'inline'; document.getElementById('1610.08509v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1610.08509v2-abstract-full" style="display: none;"> Ultrahigh energy cosmic ray air showers probe particle physics at energies beyond the reach of accelerators. Here we introduce a new method to test hadronic interaction models without relying on the absolute energy calibration, and apply it to events with primary energy 6-16 EeV (E_CM = 110-170 TeV), whose longitudinal development and lateral distribution were simultaneously measured by the Pierre Auger Observatory. The average hadronic shower is 1.33 +- 0.16 (1.61 +- 0.21) times larger than predicted using the leading LHC-tuned models EPOS-LHC (QGSJetII-04), with a corresponding excess of muons. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.08509v2-abstract-full').style.display = 'none'; document.getElementById('1610.08509v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 31 October, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 October, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Published version. Added journal reference and DOI. Added Report Number</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-PUB-16-504-AD-AE-CD-TD </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 117, 192001 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1605.02564">arXiv:1605.02564</a> <span> [<a href="https://arxiv.org/pdf/1605.02564">pdf</a>, <a href="https://arxiv.org/format/1605.02564">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.116.241101">10.1103/PhysRevLett.116.241101 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the Radiation Energy in the Radio Signal of Extensive Air Showers as a Universal Estimator of Cosmic-Ray Energy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=The+Pierre+Auger+Collaboration"> The Pierre Auger Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Aab%2C+A">Alexander Aab</a>, <a href="/search/hep-ex?searchtype=author&query=Abreu%2C+P">Pedro Abreu</a>, <a href="/search/hep-ex?searchtype=author&query=Aglietta%2C+M">Marco Aglietta</a>, <a href="/search/hep-ex?searchtype=author&query=Ahn%2C+E">Eun-Joo Ahn</a>, <a href="/search/hep-ex?searchtype=author&query=Samarai%2C+I+A">Imen Al Samarai</a>, <a href="/search/hep-ex?searchtype=author&query=Albuquerque%2C+I">Ivone Albuquerque</a>, <a href="/search/hep-ex?searchtype=author&query=Allekotte%2C+I">Ingomar Allekotte</a>, <a href="/search/hep-ex?searchtype=author&query=Allison%2C+P">Patrick Allison</a>, <a href="/search/hep-ex?searchtype=author&query=Almela%2C+A">Alejandro Almela</a>, <a href="/search/hep-ex?searchtype=author&query=Castillo%2C+J+A">Jesus Alvarez Castillo</a>, <a href="/search/hep-ex?searchtype=author&query=Alvarez-Mu%C3%B1iz%2C+J">Jaime Alvarez-Mu帽iz</a>, <a href="/search/hep-ex?searchtype=author&query=Batista%2C+R+A">Rafael Alves Batista</a>, <a href="/search/hep-ex?searchtype=author&query=Ambrosio%2C+M">Michelangelo Ambrosio</a>, <a href="/search/hep-ex?searchtype=author&query=Aminaei%2C+A">Amin Aminaei</a>, <a href="/search/hep-ex?searchtype=author&query=Anastasi%2C+G+A">Gioacchino Alex Anastasi</a>, <a href="/search/hep-ex?searchtype=author&query=Anchordoqui%2C+L">Luis Anchordoqui</a>, <a href="/search/hep-ex?searchtype=author&query=Andringa%2C+S">Sofia Andringa</a>, <a href="/search/hep-ex?searchtype=author&query=Aramo%2C+C">Carla Aramo</a>, <a href="/search/hep-ex?searchtype=author&query=Arqueros%2C+F">Fernando Arqueros</a>, <a href="/search/hep-ex?searchtype=author&query=Arsene%2C+N">Nicusor Arsene</a>, <a href="/search/hep-ex?searchtype=author&query=Asorey%2C+H+G">Hern谩n Gonzalo Asorey</a>, <a href="/search/hep-ex?searchtype=author&query=Assis%2C+P">Pedro Assis</a>, <a href="/search/hep-ex?searchtype=author&query=Aublin%2C+J">Julien Aublin</a>, <a href="/search/hep-ex?searchtype=author&query=Avila%2C+G">Gualberto Avila</a> , et al. (425 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1605.02564v2-abstract-short" style="display: inline;"> We measure the energy emitted by extensive air showers in the form of radio emission in the frequency range from 30 to 80 MHz. Exploiting the accurate energy scale of the Pierre Auger Observatory, we obtain a radiation energy of 15.8 \pm 0.7 (stat) \pm 6.7 (sys) MeV for cosmic rays with an energy of 1 EeV arriving perpendicularly to a geomagnetic field of 0.24 G, scaling quadratically with the cos… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1605.02564v2-abstract-full').style.display = 'inline'; document.getElementById('1605.02564v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1605.02564v2-abstract-full" style="display: none;"> We measure the energy emitted by extensive air showers in the form of radio emission in the frequency range from 30 to 80 MHz. Exploiting the accurate energy scale of the Pierre Auger Observatory, we obtain a radiation energy of 15.8 \pm 0.7 (stat) \pm 6.7 (sys) MeV for cosmic rays with an energy of 1 EeV arriving perpendicularly to a geomagnetic field of 0.24 G, scaling quadratically with the cosmic-ray energy. A comparison with predictions from state-of-the-art first-principle calculations shows agreement with our measurement. The radiation energy provides direct access to the calorimetric energy in the electromagnetic cascade of extensive air showers. Comparison with our result thus allows the direct calibration of any cosmic-ray radio detector against the well-established energy scale of the Pierre Auger Observatory. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1605.02564v2-abstract-full').style.display = 'none'; document.getElementById('1605.02564v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 June, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 May, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Replaced with published version. Added journal reference and DOI. Supplemental material in the ancillary files</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-PUB-16-169-AD-AE-CD-TD </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 116, 241101 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1605.01625">arXiv:1605.01625</a> <span> [<a href="https://arxiv.org/pdf/1605.01625">pdf</a>, <a href="https://arxiv.org/format/1605.01625">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/11/02/P02012">10.1088/1748-0221/11/02/P02012 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Prototype muon detectors for the AMIGA component of the Pierre Auger Observatory </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=The+Pierre+Auger+Collaboration"> The Pierre Auger Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Aab%2C+A">A. Aab</a>, <a href="/search/hep-ex?searchtype=author&query=Abreu%2C+P">P. Abreu</a>, <a href="/search/hep-ex?searchtype=author&query=Aglietta%2C+M">M. Aglietta</a>, <a href="/search/hep-ex?searchtype=author&query=Ahn%2C+E+J">E. J. Ahn</a>, <a href="/search/hep-ex?searchtype=author&query=Samarai%2C+I+A">I. Al Samarai</a>, <a href="/search/hep-ex?searchtype=author&query=Albuquerque%2C+I+F+M">I. F. M. Albuquerque</a>, <a href="/search/hep-ex?searchtype=author&query=Allekotte%2C+I">I. Allekotte</a>, <a href="/search/hep-ex?searchtype=author&query=Allison%2C+P">P. Allison</a>, <a href="/search/hep-ex?searchtype=author&query=Almela%2C+A">A. Almela</a>, <a href="/search/hep-ex?searchtype=author&query=Castillo%2C+J+A">J. Alvarez Castillo</a>, <a href="/search/hep-ex?searchtype=author&query=Alvarez-Mu%C3%B1iz%2C+J">J. Alvarez-Mu帽iz</a>, <a href="/search/hep-ex?searchtype=author&query=Batista%2C+R+A">R. Alves Batista</a>, <a href="/search/hep-ex?searchtype=author&query=Ambrosio%2C+M">M. Ambrosio</a>, <a href="/search/hep-ex?searchtype=author&query=Aminaei%2C+A">A. Aminaei</a>, <a href="/search/hep-ex?searchtype=author&query=Anastasi%2C+G+A">G. A. Anastasi</a>, <a href="/search/hep-ex?searchtype=author&query=Anchordoqui%2C+L">L. Anchordoqui</a>, <a href="/search/hep-ex?searchtype=author&query=Andrada%2C+B">B. Andrada</a>, <a href="/search/hep-ex?searchtype=author&query=Andringa%2C+S">S. Andringa</a>, <a href="/search/hep-ex?searchtype=author&query=Aramo%2C+C">C. Aramo</a>, <a href="/search/hep-ex?searchtype=author&query=Arqueros%2C+F">F. Arqueros</a>, <a href="/search/hep-ex?searchtype=author&query=Arsene%2C+N">N. Arsene</a>, <a href="/search/hep-ex?searchtype=author&query=Asorey%2C+H">H. Asorey</a>, <a href="/search/hep-ex?searchtype=author&query=Assis%2C+P">P. Assis</a>, <a href="/search/hep-ex?searchtype=author&query=Aublin%2C+J">J. Aublin</a> , et al. (429 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1605.01625v2-abstract-short" style="display: inline;"> Auger Muons and Infill for the Ground Array) is an upgrade of the Pierre Auger Observatory to extend its range of detection and to directly measure the muon content of the particle showers. It consists of an infill of surface water-Cherenkov detectors accompanied by buried scintillator detectors used for muon counting. The main objectives of the AMIGA engineering array, referred to as the Unitary… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1605.01625v2-abstract-full').style.display = 'inline'; document.getElementById('1605.01625v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1605.01625v2-abstract-full" style="display: none;"> Auger Muons and Infill for the Ground Array) is an upgrade of the Pierre Auger Observatory to extend its range of detection and to directly measure the muon content of the particle showers. It consists of an infill of surface water-Cherenkov detectors accompanied by buried scintillator detectors used for muon counting. The main objectives of the AMIGA engineering array, referred to as the Unitary Cell, are to identify and resolve all engineering issues as well as to understand the muon-number counting uncertainties related to the design of the detector. The mechanical design, fabrication and deployment processes of the muon counters of the Unitary Cell are described in this document. These muon counters modules comprise sealed PVC casings containing plastic scintillation bars, wavelength-shifter optical fibers, 64 pixel photomultiplier tubes, and acquisition electronics. The modules are buried approximately 2.25 m below ground level in order to minimize contamination from electromagnetic shower particles. The mechanical setup, which allows access to the electronics for maintenance, is also described in addition to tests of the modules' response and integrity. The completed Unitary Cell has measured a number of air showers of which a first analysis of a sample event is included here. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1605.01625v2-abstract-full').style.display = 'none'; document.getElementById('1605.01625v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 May, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 May, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Replaced with published version. Added journal reference and DOI</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-PUB-16-164-AD-AE-CD-TD </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> JINST 11 (2016) P02012 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1512.02216">arXiv:1512.02216</a> <span> [<a href="https://arxiv.org/pdf/1512.02216">pdf</a>, <a href="https://arxiv.org/format/1512.02216">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/11/01/P01018">10.1088/1748-0221/11/01/P01018 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nanosecond-level time synchronization of autonomous radio detector stations for extensive air showers </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=The+Pierre+Auger+Collaboration"> The Pierre Auger Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Aab%2C+A">A. Aab</a>, <a href="/search/hep-ex?searchtype=author&query=Abreu%2C+P">P. Abreu</a>, <a href="/search/hep-ex?searchtype=author&query=Aglietta%2C+M">M. Aglietta</a>, <a href="/search/hep-ex?searchtype=author&query=Ahn%2C+E+J">E. J. Ahn</a>, <a href="/search/hep-ex?searchtype=author&query=Samarai%2C+I+A">I. Al Samarai</a>, <a href="/search/hep-ex?searchtype=author&query=Albuquerque%2C+I+F+M">I. F. M. Albuquerque</a>, <a href="/search/hep-ex?searchtype=author&query=Allekotte%2C+I">I. Allekotte</a>, <a href="/search/hep-ex?searchtype=author&query=Allison%2C+P">P. Allison</a>, <a href="/search/hep-ex?searchtype=author&query=Almela%2C+A">A. Almela</a>, <a href="/search/hep-ex?searchtype=author&query=Castillo%2C+J+A">J. Alvarez Castillo</a>, <a href="/search/hep-ex?searchtype=author&query=Alvarez-Mu%C3%B1iz%2C+J">J. Alvarez-Mu帽iz</a>, <a href="/search/hep-ex?searchtype=author&query=Batista%2C+R+A">R. Alves Batista</a>, <a href="/search/hep-ex?searchtype=author&query=Ambrosio%2C+M">M. Ambrosio</a>, <a href="/search/hep-ex?searchtype=author&query=Aminaei%2C+A">A. Aminaei</a>, <a href="/search/hep-ex?searchtype=author&query=Anastasi%2C+G+A">G. A. Anastasi</a>, <a href="/search/hep-ex?searchtype=author&query=Anchordoqui%2C+L">L. Anchordoqui</a>, <a href="/search/hep-ex?searchtype=author&query=Andringa%2C+S">S. Andringa</a>, <a href="/search/hep-ex?searchtype=author&query=Aramo%2C+C">C. Aramo</a>, <a href="/search/hep-ex?searchtype=author&query=Arqueros%2C+F">F. Arqueros</a>, <a href="/search/hep-ex?searchtype=author&query=Arsene%2C+N">N. Arsene</a>, <a href="/search/hep-ex?searchtype=author&query=Asorey%2C+H">H. Asorey</a>, <a href="/search/hep-ex?searchtype=author&query=Assis%2C+P">P. Assis</a>, <a href="/search/hep-ex?searchtype=author&query=Aublin%2C+J">J. Aublin</a>, <a href="/search/hep-ex?searchtype=author&query=Avila%2C+G">G. Avila</a> , et al. (426 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1512.02216v2-abstract-short" style="display: inline;"> To exploit the full potential of radio measurements of cosmic-ray air showers at MHz frequencies, a detector timing synchronization within 1 ns is needed. Large distributed radio detector arrays such as the Auger Engineering Radio Array (AERA) rely on timing via the Global Positioning System (GPS) for the synchronization of individual detector station clocks. Unfortunately, GPS timing is expected… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1512.02216v2-abstract-full').style.display = 'inline'; document.getElementById('1512.02216v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1512.02216v2-abstract-full" style="display: none;"> To exploit the full potential of radio measurements of cosmic-ray air showers at MHz frequencies, a detector timing synchronization within 1 ns is needed. Large distributed radio detector arrays such as the Auger Engineering Radio Array (AERA) rely on timing via the Global Positioning System (GPS) for the synchronization of individual detector station clocks. Unfortunately, GPS timing is expected to have an accuracy no better than about 5 ns. In practice, in particular in AERA, the GPS clocks exhibit drifts on the order of tens of ns. We developed a technique to correct for the GPS drifts, and an independent method is used for cross-checks that indeed we reach nanosecond-scale timing accuracy by this correction. First, we operate a "beacon transmitter" which emits defined sine waves detected by AERA antennas recorded within the physics data. The relative phasing of these sine waves can be used to correct for GPS clock drifts. In addition to this, we observe radio pulses emitted by commercial airplanes, the position of which we determine in real time from Automatic Dependent Surveillance Broadcasts intercepted with a software-defined radio. From the known source location and the measured arrival times of the pulses we determine relative timing offsets between radio detector stations. We demonstrate with a combined analysis that the two methods give a consistent timing calibration with an accuracy of 2 ns or better. Consequently, the beacon method alone can be used in the future to continuously determine and correct for GPS clock drifts in each individual event measured by AERA. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1512.02216v2-abstract-full').style.display = 'none'; document.getElementById('1512.02216v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 February, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 7 December, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">26 pages. Replaced with published version. Added journal reference and DOI</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-PUB-15-560-AD-CD-TD </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> JINST 11 (2016) P01018 11 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1511.02109">arXiv:1511.02109</a> <span> [<a href="https://arxiv.org/pdf/1511.02109">pdf</a>, <a href="https://arxiv.org/format/1511.02109">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> The IceCube Neutrino Observatory, the Pierre Auger Observatory and the Telescope Array: Joint Contribution to the 34th International Cosmic Ray Conference (ICRC 2015) </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=IceCube+Collaboration"> IceCube Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Aartsen%2C+M+G">M. G. Aartsen</a>, <a href="/search/hep-ex?searchtype=author&query=Abraham%2C+K">K. Abraham</a>, <a href="/search/hep-ex?searchtype=author&query=Ackermann%2C+M">M. Ackermann</a>, <a href="/search/hep-ex?searchtype=author&query=Adams%2C+J">J. Adams</a>, <a href="/search/hep-ex?searchtype=author&query=Aguilar%2C+J+A">J. A. Aguilar</a>, <a href="/search/hep-ex?searchtype=author&query=Ahlers%2C+M">M. Ahlers</a>, <a href="/search/hep-ex?searchtype=author&query=Ahrens%2C+M">M. Ahrens</a>, <a href="/search/hep-ex?searchtype=author&query=Altmann%2C+D">D. Altmann</a>, <a href="/search/hep-ex?searchtype=author&query=Anderson%2C+T">T. Anderson</a>, <a href="/search/hep-ex?searchtype=author&query=Ansseau%2C+I">I. Ansseau</a>, <a href="/search/hep-ex?searchtype=author&query=Archinger%2C+M">M. Archinger</a>, <a href="/search/hep-ex?searchtype=author&query=Arguelles%2C+C">C. Arguelles</a>, <a href="/search/hep-ex?searchtype=author&query=Arlen%2C+T+C">T. C. Arlen</a>, <a href="/search/hep-ex?searchtype=author&query=Auffenberg%2C+J">J. Auffenberg</a>, <a href="/search/hep-ex?searchtype=author&query=Bai%2C+X">X. Bai</a>, <a href="/search/hep-ex?searchtype=author&query=Barwick%2C+S+W">S. W. Barwick</a>, <a href="/search/hep-ex?searchtype=author&query=Baum%2C+V">V. Baum</a>, <a href="/search/hep-ex?searchtype=author&query=Bay%2C+R">R. Bay</a>, <a href="/search/hep-ex?searchtype=author&query=Beatty%2C+J+J">J. J. Beatty</a>, <a href="/search/hep-ex?searchtype=author&query=Tjus%2C+J+B">J. Becker Tjus</a>, <a href="/search/hep-ex?searchtype=author&query=Becker%2C+K+-">K. -H. Becker</a>, <a href="/search/hep-ex?searchtype=author&query=Beiser%2C+E">E. Beiser</a>, <a href="/search/hep-ex?searchtype=author&query=BenZvi%2C+S">S. BenZvi</a>, <a href="/search/hep-ex?searchtype=author&query=Berghaus%2C+P">P. Berghaus</a> , et al. (869 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1511.02109v1-abstract-short" style="display: inline;"> We have conducted three searches for correlations between ultra-high energy cosmic rays detected by the Telescope Array and the Pierre Auger Observatory, and high-energy neutrino candidate events from IceCube. Two cross-correlation analyses with UHECRs are done: one with 39 cascades from the IceCube `high-energy starting events' sample and the other with 16 high-energy `track events'. The angular… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1511.02109v1-abstract-full').style.display = 'inline'; document.getElementById('1511.02109v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1511.02109v1-abstract-full" style="display: none;"> We have conducted three searches for correlations between ultra-high energy cosmic rays detected by the Telescope Array and the Pierre Auger Observatory, and high-energy neutrino candidate events from IceCube. Two cross-correlation analyses with UHECRs are done: one with 39 cascades from the IceCube `high-energy starting events' sample and the other with 16 high-energy `track events'. The angular separation between the arrival directions of neutrinos and UHECRs is scanned over. The same events are also used in a separate search using a maximum likelihood approach, after the neutrino arrival directions are stacked. To estimate the significance we assume UHECR magnetic deflections to be inversely proportional to their energy, with values $3^\circ$, $6^\circ$ and $9^\circ$ at 100 EeV to allow for the uncertainties on the magnetic field strength and UHECR charge. A similar analysis is performed on stacked UHECR arrival directions and the IceCube sample of through-going muon track events which were optimized for neutrino point-source searches. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1511.02109v1-abstract-full').style.display = 'none'; document.getElementById('1511.02109v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 November, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">one proceeding, the 34th International Cosmic Ray Conference, 30 July - 6 August 2015, The Hague, The Netherlands; will appear in PoS(ICRC2015)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1510.01561">arXiv:1510.01561</a> <span> [<a href="https://arxiv.org/pdf/1510.01561">pdf</a>, <a href="https://arxiv.org/format/1510.01561">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjc/s10052-015-3868-9">10.1140/epjc/s10052-015-3868-9 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The prototype detection unit of the KM3NeT detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=KM3NeT+Collaboration"> KM3NeT Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Adri%C3%A1n-Mart%C3%ADnez%2C+S">S. Adri谩n-Mart铆nez</a>, <a href="/search/hep-ex?searchtype=author&query=Ageron%2C+M">M. Ageron</a>, <a href="/search/hep-ex?searchtype=author&query=Aharonian%2C+F">F. Aharonian</a>, <a href="/search/hep-ex?searchtype=author&query=Aiello%2C+S">S. Aiello</a>, <a href="/search/hep-ex?searchtype=author&query=Albert%2C+A">A. Albert</a>, <a href="/search/hep-ex?searchtype=author&query=Ameli%2C+F">F. Ameli</a>, <a href="/search/hep-ex?searchtype=author&query=Anassontzis%2C+E+G">E. G. Anassontzis</a>, <a href="/search/hep-ex?searchtype=author&query=Androulakis%2C+G+C">G. C. Androulakis</a>, <a href="/search/hep-ex?searchtype=author&query=Anghinolfi%2C+M">M. Anghinolfi</a>, <a href="/search/hep-ex?searchtype=author&query=Anton%2C+G">G. Anton</a>, <a href="/search/hep-ex?searchtype=author&query=Anvar%2C+S">S. Anvar</a>, <a href="/search/hep-ex?searchtype=author&query=Ardid%2C+M">M. Ardid</a>, <a href="/search/hep-ex?searchtype=author&query=Avgitas%2C+T">T. Avgitas</a>, <a href="/search/hep-ex?searchtype=author&query=Balasi%2C+K">K. Balasi</a>, <a href="/search/hep-ex?searchtype=author&query=Band%2C+H">H. Band</a>, <a href="/search/hep-ex?searchtype=author&query=Barbarino%2C+G">G. Barbarino</a>, <a href="/search/hep-ex?searchtype=author&query=Barbarito%2C+E">E. Barbarito</a>, <a href="/search/hep-ex?searchtype=author&query=Barbato%2C+F">F. Barbato</a>, <a href="/search/hep-ex?searchtype=author&query=Baret%2C+B">B. Baret</a>, <a href="/search/hep-ex?searchtype=author&query=Baron%2C+S">S. Baron</a>, <a href="/search/hep-ex?searchtype=author&query=Barrios%2C+J">J. Barrios</a>, <a href="/search/hep-ex?searchtype=author&query=Belias%2C+A">A. Belias</a>, <a href="/search/hep-ex?searchtype=author&query=Berbee%2C+E">E. Berbee</a>, <a href="/search/hep-ex?searchtype=author&query=Berg%2C+A+M+v+d">A. M. van den Berg</a> , et al. (224 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1510.01561v2-abstract-short" style="display: inline;"> A prototype detection unit of the KM3NeT deep-sea neutrino telescope has been installed at 3500m depth 80km offshore the Italian coast. KM3NeT in its final configuration will contain several hundreds of detection units. Each detection unit is a mechanical structure anchored to the sea floor, held vertical by a submerged buoy and supporting optical modules for the detection of Cherenkov light emitt… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1510.01561v2-abstract-full').style.display = 'inline'; document.getElementById('1510.01561v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1510.01561v2-abstract-full" style="display: none;"> A prototype detection unit of the KM3NeT deep-sea neutrino telescope has been installed at 3500m depth 80km offshore the Italian coast. KM3NeT in its final configuration will contain several hundreds of detection units. Each detection unit is a mechanical structure anchored to the sea floor, held vertical by a submerged buoy and supporting optical modules for the detection of Cherenkov light emitted by charged secondary particles emerging from neutrino interactions. This prototype string implements three optical modules with 31 photomultiplier tubes each. These optical modules were developed by the KM3NeT Collaboration to enhance the detection capability of neutrino interactions. The prototype detection unit was operated since its deployment in May 2014 until its decommissioning in July 2015. Reconstruction of the particle trajectories from the data requires a nanosecond accuracy in the time calibration. A procedure for relative time calibration of the photomultiplier tubes contained in each optical module is described. This procedure is based on the measured coincidences produced in the sea by the 40K background light and can easily be expanded to a detector with several thousands of optical modules. The time offsets between the different optical modules are obtained using LED nanobeacons mounted inside them. A set of data corresponding to 600 hours of livetime was analysed. The results show good agreement with Monte Carlo simulations of the expected optical background and the signal from atmospheric muons. An almost background-free sample of muons was selected by filtering the time correlated signals on all the three optical modules. The zenith angle of the selected muons was reconstructed with a precision of about 3掳. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1510.01561v2-abstract-full').style.display = 'none'; document.getElementById('1510.01561v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 December, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 October, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Accepted for publication by EPJ C</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C (2016) 76:54 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1503.07786">arXiv:1503.07786</a> <span> [<a href="https://arxiv.org/pdf/1503.07786">pdf</a>, <a href="https://arxiv.org/format/1503.07786">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1475-7516/2015/08/049">10.1088/1475-7516/2015/08/049 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the cosmic ray spectrum above $4{\times}10^{18}$ eV using inclined events detected with the Pierre Auger Observatory </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=The+Pierre+Auger+Collaboration"> The Pierre Auger Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Aab%2C+A">Alexander Aab</a>, <a href="/search/hep-ex?searchtype=author&query=Abreu%2C+P">Pedro Abreu</a>, <a href="/search/hep-ex?searchtype=author&query=Aglietta%2C+M">Marco Aglietta</a>, <a href="/search/hep-ex?searchtype=author&query=Ahn%2C+E">Eun-Joo Ahn</a>, <a href="/search/hep-ex?searchtype=author&query=Samarai%2C+I+A">Imen Al Samarai</a>, <a href="/search/hep-ex?searchtype=author&query=Albuquerque%2C+I">Ivone Albuquerque</a>, <a href="/search/hep-ex?searchtype=author&query=Allekotte%2C+I">Ingomar Allekotte</a>, <a href="/search/hep-ex?searchtype=author&query=Allison%2C+P">Patrick Allison</a>, <a href="/search/hep-ex?searchtype=author&query=Almela%2C+A">Alejandro Almela</a>, <a href="/search/hep-ex?searchtype=author&query=Castillo%2C+J+A">Jesus Alvarez Castillo</a>, <a href="/search/hep-ex?searchtype=author&query=Alvarez-Mu%C3%B1iz%2C+J">Jaime Alvarez-Mu帽iz</a>, <a href="/search/hep-ex?searchtype=author&query=Batista%2C+R+A">Rafael Alves Batista</a>, <a href="/search/hep-ex?searchtype=author&query=Ambrosio%2C+M">Michelangelo Ambrosio</a>, <a href="/search/hep-ex?searchtype=author&query=Aminaei%2C+A">Amin Aminaei</a>, <a href="/search/hep-ex?searchtype=author&query=Anchordoqui%2C+L">Luis Anchordoqui</a>, <a href="/search/hep-ex?searchtype=author&query=Andringa%2C+S">Sofia Andringa</a>, <a href="/search/hep-ex?searchtype=author&query=Aramo%2C+C">Carla Aramo</a>, <a href="/search/hep-ex?searchtype=author&query=Aranda%2C+V+M">Victor Manuel Aranda</a>, <a href="/search/hep-ex?searchtype=author&query=Arqueros%2C+F">Fernando Arqueros</a>, <a href="/search/hep-ex?searchtype=author&query=Arsene%2C+N">Nicusor Arsene</a>, <a href="/search/hep-ex?searchtype=author&query=Asorey%2C+H+G">Hern谩n Gonzalo Asorey</a>, <a href="/search/hep-ex?searchtype=author&query=Assis%2C+P">Pedro Assis</a>, <a href="/search/hep-ex?searchtype=author&query=Aublin%2C+J">Julien Aublin</a>, <a href="/search/hep-ex?searchtype=author&query=Ave%2C+M">Maximo Ave</a> , et al. (439 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1503.07786v2-abstract-short" style="display: inline;"> A measurement of the cosmic-ray spectrum for energies exceeding $4{\times}10^{18}$ eV is presented, which is based on the analysis of showers with zenith angles greater than $60^{\circ}$ detected with the Pierre Auger Observatory between 1 January 2004 and 31 December 2013. The measured spectrum confirms a flux suppression at the highest energies. Above $5.3{\times}10^{18}$ eV, the "ankle", the fl… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1503.07786v2-abstract-full').style.display = 'inline'; document.getElementById('1503.07786v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1503.07786v2-abstract-full" style="display: none;"> A measurement of the cosmic-ray spectrum for energies exceeding $4{\times}10^{18}$ eV is presented, which is based on the analysis of showers with zenith angles greater than $60^{\circ}$ detected with the Pierre Auger Observatory between 1 January 2004 and 31 December 2013. The measured spectrum confirms a flux suppression at the highest energies. Above $5.3{\times}10^{18}$ eV, the "ankle", the flux can be described by a power law $E^{-纬}$ with index $纬=2.70 \pm 0.02 \,\text{(stat)} \pm 0.1\,\text{(sys)}$ followed by a smooth suppression region. For the energy ($E_\text{s}$) at which the spectral flux has fallen to one-half of its extrapolated value in the absence of suppression, we find $E_\text{s}=(5.12\pm0.25\,\text{(stat)}^{+1.0}_{-1.2}\,\text{(sys)}){\times}10^{19}$ eV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1503.07786v2-abstract-full').style.display = 'none'; document.getElementById('1503.07786v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 November, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 March, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Replaced with published version. Added journal reference and DOI</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-PUB-15-099-AD-AE-CD-TD </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> JCAP 08 (2015) 049 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1407.3214">arXiv:1407.3214</a> <span> [<a href="https://arxiv.org/pdf/1407.3214">pdf</a>, <a href="https://arxiv.org/ps/1407.3214">ps</a>, <a href="https://arxiv.org/format/1407.3214">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1475-7516/2014/08/019">10.1088/1475-7516/2014/08/019 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Reconstruction of inclined air showers detected with the Pierre Auger Observatory </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=The+Pierre+Auger+Collaboration"> The Pierre Auger Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Aab%2C+A">A. Aab</a>, <a href="/search/hep-ex?searchtype=author&query=Abreu%2C+P">P. Abreu</a>, <a href="/search/hep-ex?searchtype=author&query=Aglietta%2C+M">M. Aglietta</a>, <a href="/search/hep-ex?searchtype=author&query=Ahlers%2C+M">M. Ahlers</a>, <a href="/search/hep-ex?searchtype=author&query=Ahn%2C+E+J">E. J. Ahn</a>, <a href="/search/hep-ex?searchtype=author&query=Samarai%2C+I+A">I. Al Samarai</a>, <a href="/search/hep-ex?searchtype=author&query=Albuquerque%2C+I+F+M">I. F. M. Albuquerque</a>, <a href="/search/hep-ex?searchtype=author&query=Allekotte%2C+I">I. Allekotte</a>, <a href="/search/hep-ex?searchtype=author&query=Allen%2C+J">J. Allen</a>, <a href="/search/hep-ex?searchtype=author&query=Allison%2C+P">P. Allison</a>, <a href="/search/hep-ex?searchtype=author&query=Almela%2C+A">A. Almela</a>, <a href="/search/hep-ex?searchtype=author&query=Castillo%2C+J+A">J. Alvarez Castillo</a>, <a href="/search/hep-ex?searchtype=author&query=Alvarez-Mu%C3%B1iz%2C+J">J. Alvarez-Mu帽iz</a>, <a href="/search/hep-ex?searchtype=author&query=Batista%2C+R+A">R. Alves Batista</a>, <a href="/search/hep-ex?searchtype=author&query=Ambrosio%2C+M">M. Ambrosio</a>, <a href="/search/hep-ex?searchtype=author&query=Aminaei%2C+A">A. Aminaei</a>, <a href="/search/hep-ex?searchtype=author&query=Anchordoqui%2C+L">L. Anchordoqui</a>, <a href="/search/hep-ex?searchtype=author&query=Andringa%2C+S">S. Andringa</a>, <a href="/search/hep-ex?searchtype=author&query=Aramo%2C+C">C. Aramo</a>, <a href="/search/hep-ex?searchtype=author&query=Arqueros%2C+F">F. Arqueros</a>, <a href="/search/hep-ex?searchtype=author&query=Asorey%2C+H">H. Asorey</a>, <a href="/search/hep-ex?searchtype=author&query=Assis%2C+P">P. Assis</a>, <a href="/search/hep-ex?searchtype=author&query=Aublin%2C+J">J. Aublin</a>, <a href="/search/hep-ex?searchtype=author&query=Ave%2C+M">M. Ave</a> , et al. (463 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1407.3214v1-abstract-short" style="display: inline;"> We describe the method devised to reconstruct inclined cosmic-ray air showers with zenith angles greater than $60^\circ$ detected with the surface array of the Pierre Auger Observatory. The measured signals at the ground level are fitted to muon density distributions predicted with atmospheric cascade models to obtain the relative shower size as an overall normalization parameter. The method is ev… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1407.3214v1-abstract-full').style.display = 'inline'; document.getElementById('1407.3214v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1407.3214v1-abstract-full" style="display: none;"> We describe the method devised to reconstruct inclined cosmic-ray air showers with zenith angles greater than $60^\circ$ detected with the surface array of the Pierre Auger Observatory. The measured signals at the ground level are fitted to muon density distributions predicted with atmospheric cascade models to obtain the relative shower size as an overall normalization parameter. The method is evaluated using simulated showers to test its performance. The energy of the cosmic rays is calibrated using a sub-sample of events reconstructed with both the fluorescence and surface array techniques. The reconstruction method described here provides the basis of complementary analyses including an independent measurement of the energy spectrum of ultra-high energy cosmic rays using very inclined events collected by the Pierre Auger Observatory. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1407.3214v1-abstract-full').style.display = 'none'; document.getElementById('1407.3214v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 July, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">27 pages, 19 figures, accepted for publication in Journal of Cosmology and Astroparticle Physics (JCAP)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1111.6645">arXiv:1111.6645</a> <span> [<a href="https://arxiv.org/pdf/1111.6645">pdf</a>, <a href="https://arxiv.org/ps/1111.6645">ps</a>, <a href="https://arxiv.org/format/1111.6645">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.astropartphys.2011.08.001">10.1016/j.astropartphys.2011.08.001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Lateral Trigger Probability function for the Ultra-High Energy Cosmic Ray Showers detected by the Pierre Auger Observatory </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=The+Pierre+Auger+Collaboration"> The Pierre Auger Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Abreu%2C+P">P. Abreu</a>, <a href="/search/hep-ex?searchtype=author&query=Aglietta%2C+M">M. Aglietta</a>, <a href="/search/hep-ex?searchtype=author&query=Ahn%2C+E+J">E. J. Ahn</a>, <a href="/search/hep-ex?searchtype=author&query=Albuquerque%2C+I+F+M">I. F. M. Albuquerque</a>, <a href="/search/hep-ex?searchtype=author&query=Allard%2C+D">D. Allard</a>, <a href="/search/hep-ex?searchtype=author&query=Allekotte%2C+I">I. Allekotte</a>, <a href="/search/hep-ex?searchtype=author&query=Allen%2C+J">J. Allen</a>, <a href="/search/hep-ex?searchtype=author&query=Allison%2C+P">P. Allison</a>, <a href="/search/hep-ex?searchtype=author&query=Castillo%2C+J+A">J. Alvarez Castillo</a>, <a href="/search/hep-ex?searchtype=author&query=Alvarez-Mu%C3%B1iz%2C+J">J. Alvarez-Mu帽iz</a>, <a href="/search/hep-ex?searchtype=author&query=Ambrosio%2C+M">M. Ambrosio</a>, <a href="/search/hep-ex?searchtype=author&query=Aminaei%2C+A">A. Aminaei</a>, <a href="/search/hep-ex?searchtype=author&query=Anchordoqui%2C+L">L. Anchordoqui</a>, <a href="/search/hep-ex?searchtype=author&query=Andringa%2C+S">S. Andringa</a>, <a href="/search/hep-ex?searchtype=author&query=Anti%C4%8Di%C4%87%2C+T">T. Anti膷i膰</a>, <a href="/search/hep-ex?searchtype=author&query=Anzalone%2C+A">A. Anzalone</a>, <a href="/search/hep-ex?searchtype=author&query=Aramo%2C+C">C. Aramo</a>, <a href="/search/hep-ex?searchtype=author&query=Arganda%2C+E">E. Arganda</a>, <a href="/search/hep-ex?searchtype=author&query=Arqueros%2C+F">F. Arqueros</a>, <a href="/search/hep-ex?searchtype=author&query=Asorey%2C+H">H. Asorey</a>, <a href="/search/hep-ex?searchtype=author&query=Assis%2C+P">P. Assis</a>, <a href="/search/hep-ex?searchtype=author&query=Aublin%2C+J">J. Aublin</a>, <a href="/search/hep-ex?searchtype=author&query=Ave%2C+M">M. Ave</a>, <a href="/search/hep-ex?searchtype=author&query=Avenier%2C+M">M. Avenier</a> , et al. (473 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1111.6645v1-abstract-short" style="display: inline;"> In this paper we introduce the concept of Lateral Trigger Probability (LTP) function, i.e., the probability for an extensive air shower (EAS) to trigger an individual detector of a ground based array as a function of distance to the shower axis, taking into account energy, mass and direction of the primary cosmic ray. We apply this concept to the surface array of the Pierre Auger Observatory consi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1111.6645v1-abstract-full').style.display = 'inline'; document.getElementById('1111.6645v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1111.6645v1-abstract-full" style="display: none;"> In this paper we introduce the concept of Lateral Trigger Probability (LTP) function, i.e., the probability for an extensive air shower (EAS) to trigger an individual detector of a ground based array as a function of distance to the shower axis, taking into account energy, mass and direction of the primary cosmic ray. We apply this concept to the surface array of the Pierre Auger Observatory consisting of a 1.5 km spaced grid of about 1600 water Cherenkov stations. Using Monte Carlo simulations of ultra-high energy showers the LTP functions are derived for energies in the range between 10^{17} and 10^{19} eV and zenith angles up to 65 degs. A parametrization combining a step function with an exponential is found to reproduce them very well in the considered range of energies and zenith angles. The LTP functions can also be obtained from data using events simultaneously observed by the fluorescence and the surface detector of the Pierre Auger Observatory (hybrid events). We validate the Monte-Carlo results showing how LTP functions from data are in good agreement with simulations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1111.6645v1-abstract-full').style.display = 'none'; document.getElementById('1111.6645v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 November, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">22 pages, 8 figures. Published in Astroparticle Physics</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Astroparticle Physics 35 (2011) 266-276 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1107.4809">arXiv:1107.4809</a> <span> [<a href="https://arxiv.org/pdf/1107.4809">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> The Pierre Auger Observatory I: The Cosmic Ray Energy Spectrum and Related Measurements </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=The+Pierre+Auger+Collaboration"> The Pierre Auger Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Abreu%2C+P">P. Abreu</a>, <a href="/search/hep-ex?searchtype=author&query=Aglietta%2C+M">M. Aglietta</a>, <a href="/search/hep-ex?searchtype=author&query=Ahn%2C+E+J">E. J. Ahn</a>, <a href="/search/hep-ex?searchtype=author&query=Albuquerque%2C+I+F+M">I. F. M. Albuquerque</a>, <a href="/search/hep-ex?searchtype=author&query=Allard%2C+D">D. Allard</a>, <a href="/search/hep-ex?searchtype=author&query=Allekotte%2C+I">I. Allekotte</a>, <a href="/search/hep-ex?searchtype=author&query=Allen%2C+J">J. Allen</a>, <a href="/search/hep-ex?searchtype=author&query=Allison%2C+P">P. Allison</a>, <a href="/search/hep-ex?searchtype=author&query=Castillo%2C+J+A">J. Alvarez Castillo</a>, <a href="/search/hep-ex?searchtype=author&query=Alvarez-Mu%C3%B1iz%2C+J">J. Alvarez-Mu帽iz</a>, <a href="/search/hep-ex?searchtype=author&query=Ambrosio%2C+M">M. Ambrosio</a>, <a href="/search/hep-ex?searchtype=author&query=Aminaei%2C+A">A. Aminaei</a>, <a href="/search/hep-ex?searchtype=author&query=Anchordoqui%2C+L">L. Anchordoqui</a>, <a href="/search/hep-ex?searchtype=author&query=Andringa%2C+S">S. Andringa</a>, <a href="/search/hep-ex?searchtype=author&query=Anti%C4%8Di%C4%87%2C+T">T. Anti膷i膰</a>, <a href="/search/hep-ex?searchtype=author&query=Anzalone%2C+A">A. Anzalone</a>, <a href="/search/hep-ex?searchtype=author&query=Aramo%2C+C">C. Aramo</a>, <a href="/search/hep-ex?searchtype=author&query=Arganda%2C+E">E. Arganda</a>, <a href="/search/hep-ex?searchtype=author&query=Arqueros%2C+F">F. Arqueros</a>, <a href="/search/hep-ex?searchtype=author&query=Asorey%2C+H">H. Asorey</a>, <a href="/search/hep-ex?searchtype=author&query=Assis%2C+P">P. Assis</a>, <a href="/search/hep-ex?searchtype=author&query=Aublin%2C+J">J. Aublin</a>, <a href="/search/hep-ex?searchtype=author&query=Ave%2C+M">M. Ave</a>, <a href="/search/hep-ex?searchtype=author&query=Avenier%2C+M">M. Avenier</a> , et al. (471 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1107.4809v1-abstract-short" style="display: inline;"> Studies of the cosmic ray energy spectrum at the highest energies with the Pierre Auger Observatory </span> <span class="abstract-full has-text-grey-dark mathjax" id="1107.4809v1-abstract-full" style="display: none;"> Studies of the cosmic ray energy spectrum at the highest energies with the Pierre Auger Observatory <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1107.4809v1-abstract-full').style.display = 'none'; document.getElementById('1107.4809v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 July, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Contributions to the 32nd International Cosmic Ray Conference, Beijing, China, August 2011</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1107.4807">arXiv:1107.4807</a> <span> [<a href="https://arxiv.org/pdf/1107.4807">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-6596/375/1/052006">10.1088/1742-6596/375/1/052006 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Pierre Auger Observatory V: Enhancements </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=The+Pierre+Auger+Collaboration"> The Pierre Auger Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Abreu%2C+P">P. Abreu</a>, <a href="/search/hep-ex?searchtype=author&query=Aglietta%2C+M">M. Aglietta</a>, <a href="/search/hep-ex?searchtype=author&query=Ahn%2C+E+J">E. J. Ahn</a>, <a href="/search/hep-ex?searchtype=author&query=Albuquerque%2C+I+F+M">I. F. M. Albuquerque</a>, <a href="/search/hep-ex?searchtype=author&query=Allard%2C+D">D. Allard</a>, <a href="/search/hep-ex?searchtype=author&query=Allekotte%2C+I">I. Allekotte</a>, <a href="/search/hep-ex?searchtype=author&query=Allen%2C+J">J. Allen</a>, <a href="/search/hep-ex?searchtype=author&query=Allison%2C+P">P. Allison</a>, <a href="/search/hep-ex?searchtype=author&query=Castillo%2C+J+A">J. Alvarez Castillo</a>, <a href="/search/hep-ex?searchtype=author&query=Alvarez-Mu%C3%B1iz%2C+J">J. Alvarez-Mu帽iz</a>, <a href="/search/hep-ex?searchtype=author&query=Ambrosio%2C+M">M. Ambrosio</a>, <a href="/search/hep-ex?searchtype=author&query=Aminaei%2C+A">A. Aminaei</a>, <a href="/search/hep-ex?searchtype=author&query=Anchordoqui%2C+L">L. Anchordoqui</a>, <a href="/search/hep-ex?searchtype=author&query=Andringa%2C+S">S. Andringa</a>, <a href="/search/hep-ex?searchtype=author&query=Anti%C4%8Di%C4%87%2C+T">T. Anti膷i膰</a>, <a href="/search/hep-ex?searchtype=author&query=Anzalone%2C+A">A. Anzalone</a>, <a href="/search/hep-ex?searchtype=author&query=Aramo%2C+C">C. Aramo</a>, <a href="/search/hep-ex?searchtype=author&query=Arganda%2C+E">E. Arganda</a>, <a href="/search/hep-ex?searchtype=author&query=Arqueros%2C+F">F. Arqueros</a>, <a href="/search/hep-ex?searchtype=author&query=Asorey%2C+H">H. Asorey</a>, <a href="/search/hep-ex?searchtype=author&query=Assis%2C+P">P. Assis</a>, <a href="/search/hep-ex?searchtype=author&query=Aublin%2C+J">J. Aublin</a>, <a href="/search/hep-ex?searchtype=author&query=Ave%2C+M">M. Ave</a>, <a href="/search/hep-ex?searchtype=author&query=Avenier%2C+M">M. Avenier</a> , et al. (471 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1107.4807v1-abstract-short" style="display: inline;"> Ongoing and planned enhancements of the Pierre Auger Observatory </span> <span class="abstract-full has-text-grey-dark mathjax" id="1107.4807v1-abstract-full" style="display: none;"> Ongoing and planned enhancements of the Pierre Auger Observatory <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1107.4807v1-abstract-full').style.display = 'none'; document.getElementById('1107.4807v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 July, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Contributions to 32nd International Cosmic Ray Conference, Beijing, China, August 2011</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1107.4806">arXiv:1107.4806</a> <span> [<a href="https://arxiv.org/pdf/1107.4806">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> The Pierre Auger Observatory IV: Operation and Monitoring </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=The+Pierre+Auger+Collaboration"> The Pierre Auger Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Abreu%2C+P">P. Abreu</a>, <a href="/search/hep-ex?searchtype=author&query=Aglietta%2C+M">M. Aglietta</a>, <a href="/search/hep-ex?searchtype=author&query=Ahn%2C+E+J">E. J. Ahn</a>, <a href="/search/hep-ex?searchtype=author&query=Albuquerque%2C+I+F+M">I. F. M. Albuquerque</a>, <a href="/search/hep-ex?searchtype=author&query=Allard%2C+D">D. Allard</a>, <a href="/search/hep-ex?searchtype=author&query=Allekotte%2C+I">I. Allekotte</a>, <a href="/search/hep-ex?searchtype=author&query=Allen%2C+J">J. Allen</a>, <a href="/search/hep-ex?searchtype=author&query=Allison%2C+P">P. Allison</a>, <a href="/search/hep-ex?searchtype=author&query=Castillo%2C+J+A">J. Alvarez Castillo</a>, <a href="/search/hep-ex?searchtype=author&query=Alvarez-Mu%C3%B1iz%2C+J">J. Alvarez-Mu帽iz</a>, <a href="/search/hep-ex?searchtype=author&query=Ambrosio%2C+M">M. Ambrosio</a>, <a href="/search/hep-ex?searchtype=author&query=Aminaei%2C+A">A. Aminaei</a>, <a href="/search/hep-ex?searchtype=author&query=Anchordoqui%2C+L">L. Anchordoqui</a>, <a href="/search/hep-ex?searchtype=author&query=Andringa%2C+S">S. Andringa</a>, <a href="/search/hep-ex?searchtype=author&query=Anti%C4%8Di%C4%87%2C+T">T. Anti膷i膰</a>, <a href="/search/hep-ex?searchtype=author&query=Anzalone%2C+A">A. Anzalone</a>, <a href="/search/hep-ex?searchtype=author&query=Aramo%2C+C">C. Aramo</a>, <a href="/search/hep-ex?searchtype=author&query=Arganda%2C+E">E. Arganda</a>, <a href="/search/hep-ex?searchtype=author&query=Arqueros%2C+F">F. Arqueros</a>, <a href="/search/hep-ex?searchtype=author&query=Asorey%2C+H">H. Asorey</a>, <a href="/search/hep-ex?searchtype=author&query=Assis%2C+P">P. Assis</a>, <a href="/search/hep-ex?searchtype=author&query=Aublin%2C+J">J. Aublin</a>, <a href="/search/hep-ex?searchtype=author&query=Ave%2C+M">M. Ave</a>, <a href="/search/hep-ex?searchtype=author&query=Avenier%2C+M">M. Avenier</a> , et al. (471 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1107.4806v1-abstract-short" style="display: inline;"> Technical reports on operations and monitoring of the Pierre Auger Observatory </span> <span class="abstract-full has-text-grey-dark mathjax" id="1107.4806v1-abstract-full" style="display: none;"> Technical reports on operations and monitoring of the Pierre Auger Observatory <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1107.4806v1-abstract-full').style.display = 'none'; document.getElementById('1107.4806v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 July, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Constributions to 32nd International Cosmic Ray Conference, Beijing, China, August 2011</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1107.4805">arXiv:1107.4805</a> <span> [<a href="https://arxiv.org/pdf/1107.4805">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> The Pierre Auger Observatory III: Other Astrophysical Observations </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=The+Pierre+Auger+Collaboration"> The Pierre Auger Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Abreu%2C+P">P. Abreu</a>, <a href="/search/hep-ex?searchtype=author&query=Aglietta%2C+M">M. Aglietta</a>, <a href="/search/hep-ex?searchtype=author&query=Ahn%2C+E+J">E. J. Ahn</a>, <a href="/search/hep-ex?searchtype=author&query=Albuquerque%2C+I+F+M">I. F. M. Albuquerque</a>, <a href="/search/hep-ex?searchtype=author&query=Allard%2C+D">D. Allard</a>, <a href="/search/hep-ex?searchtype=author&query=Allekotte%2C+I">I. Allekotte</a>, <a href="/search/hep-ex?searchtype=author&query=Allen%2C+J">J. Allen</a>, <a href="/search/hep-ex?searchtype=author&query=Allison%2C+P">P. Allison</a>, <a href="/search/hep-ex?searchtype=author&query=Castillo%2C+J+A">J. Alvarez Castillo</a>, <a href="/search/hep-ex?searchtype=author&query=Alvarez-Mu%C3%B1iz%2C+J">J. Alvarez-Mu帽iz</a>, <a href="/search/hep-ex?searchtype=author&query=Ambrosio%2C+M">M. Ambrosio</a>, <a href="/search/hep-ex?searchtype=author&query=Aminaei%2C+A">A. Aminaei</a>, <a href="/search/hep-ex?searchtype=author&query=Anchordoqui%2C+L">L. Anchordoqui</a>, <a href="/search/hep-ex?searchtype=author&query=Andringa%2C+S">S. Andringa</a>, <a href="/search/hep-ex?searchtype=author&query=Anti%C4%8Di%C4%87%2C+T">T. Anti膷i膰</a>, <a href="/search/hep-ex?searchtype=author&query=Anzalone%2C+A">A. Anzalone</a>, <a href="/search/hep-ex?searchtype=author&query=Aramo%2C+C">C. Aramo</a>, <a href="/search/hep-ex?searchtype=author&query=Arganda%2C+E">E. Arganda</a>, <a href="/search/hep-ex?searchtype=author&query=Arqueros%2C+F">F. Arqueros</a>, <a href="/search/hep-ex?searchtype=author&query=Asorey%2C+H">H. Asorey</a>, <a href="/search/hep-ex?searchtype=author&query=Assis%2C+P">P. Assis</a>, <a href="/search/hep-ex?searchtype=author&query=Aublin%2C+J">J. Aublin</a>, <a href="/search/hep-ex?searchtype=author&query=Ave%2C+M">M. Ave</a>, <a href="/search/hep-ex?searchtype=author&query=Avenier%2C+M">M. Avenier</a> , et al. (471 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1107.4805v1-abstract-short" style="display: inline;"> Astrophysical observations of ultra-high-energy cosmic rays with the Pierre Auger Observatory </span> <span class="abstract-full has-text-grey-dark mathjax" id="1107.4805v1-abstract-full" style="display: none;"> Astrophysical observations of ultra-high-energy cosmic rays with the Pierre Auger Observatory <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1107.4805v1-abstract-full').style.display = 'none'; document.getElementById('1107.4805v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 July, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Contributions to the 32nd International Cosmic Ray Conference, Beijing, China, August 2011</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1107.4804">arXiv:1107.4804</a> <span> [<a href="https://arxiv.org/pdf/1107.4804">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> The Pierre Auger Observatory II: Studies of Cosmic Ray Composition and Hadronic Interaction models </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=The+Pierre+Auger+Collaboration"> The Pierre Auger Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Abreu%2C+P">P. Abreu</a>, <a href="/search/hep-ex?searchtype=author&query=Aglietta%2C+M">M. Aglietta</a>, <a href="/search/hep-ex?searchtype=author&query=Ahn%2C+E+J">E. J. Ahn</a>, <a href="/search/hep-ex?searchtype=author&query=Albuquerque%2C+I+F+M">I. F. M. Albuquerque</a>, <a href="/search/hep-ex?searchtype=author&query=Allard%2C+D">D. Allard</a>, <a href="/search/hep-ex?searchtype=author&query=Allekotte%2C+I">I. Allekotte</a>, <a href="/search/hep-ex?searchtype=author&query=Allen%2C+J">J. Allen</a>, <a href="/search/hep-ex?searchtype=author&query=Allison%2C+P">P. Allison</a>, <a href="/search/hep-ex?searchtype=author&query=Castillo%2C+J+A">J. Alvarez Castillo</a>, <a href="/search/hep-ex?searchtype=author&query=Alvarez-Mu%C3%B1iz%2C+J">J. Alvarez-Mu帽iz</a>, <a href="/search/hep-ex?searchtype=author&query=Ambrosio%2C+M">M. Ambrosio</a>, <a href="/search/hep-ex?searchtype=author&query=Aminaei%2C+A">A. Aminaei</a>, <a href="/search/hep-ex?searchtype=author&query=Anchordoqui%2C+L">L. Anchordoqui</a>, <a href="/search/hep-ex?searchtype=author&query=Andringa%2C+S">S. Andringa</a>, <a href="/search/hep-ex?searchtype=author&query=Anti%C4%8Di%C4%87%2C+T">T. Anti膷i膰</a>, <a href="/search/hep-ex?searchtype=author&query=Anzalone%2C+A">A. Anzalone</a>, <a href="/search/hep-ex?searchtype=author&query=Aramo%2C+C">C. Aramo</a>, <a href="/search/hep-ex?searchtype=author&query=Arganda%2C+E">E. Arganda</a>, <a href="/search/hep-ex?searchtype=author&query=Arqueros%2C+F">F. Arqueros</a>, <a href="/search/hep-ex?searchtype=author&query=Asorey%2C+H">H. Asorey</a>, <a href="/search/hep-ex?searchtype=author&query=Assis%2C+P">P. Assis</a>, <a href="/search/hep-ex?searchtype=author&query=Aublin%2C+J">J. Aublin</a>, <a href="/search/hep-ex?searchtype=author&query=Ave%2C+M">M. Ave</a>, <a href="/search/hep-ex?searchtype=author&query=Avenier%2C+M">M. Avenier</a> , et al. (471 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1107.4804v1-abstract-short" style="display: inline;"> Studies of the composition of the highest energy cosmic rays with the Pierre Auger Observatory, including examination of hadronic physics effects on the structure of extensive air showers. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1107.4804v1-abstract-full" style="display: none;"> Studies of the composition of the highest energy cosmic rays with the Pierre Auger Observatory, including examination of hadronic physics effects on the structure of extensive air showers. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1107.4804v1-abstract-full').style.display = 'none'; document.getElementById('1107.4804v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 July, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Contributions to the 32nd International Cosmic Ray Conference, Beijing, China, August 2011</span> </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> 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