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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/2410.13515">arXiv:2410.13515</a> <span> [<a href="https://arxiv.org/pdf/2410.13515">pdf</a>, <a href="https://arxiv.org/format/2410.13515">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 - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Observation of a rare beta decay of the charmed baryon with a Graph Neural Network </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=BESIII+Collaboration"> BESIII Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Ablikim%2C+M">M. Ablikim</a>, <a href="/search/nucl-ex?searchtype=author&query=Achasov%2C+M+N">M. N. Achasov</a>, <a href="/search/nucl-ex?searchtype=author&query=Adlarson%2C+P">P. Adlarson</a>, <a href="/search/nucl-ex?searchtype=author&query=Afedulidis%2C+O">O. Afedulidis</a>, <a href="/search/nucl-ex?searchtype=author&query=Ai%2C+X+C">X. C. Ai</a>, <a href="/search/nucl-ex?searchtype=author&query=Aliberti%2C+R">R. Aliberti</a>, <a href="/search/nucl-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/nucl-ex?searchtype=author&query=An%2C+Q">Q. An</a>, <a href="/search/nucl-ex?searchtype=author&query=Bai%2C+Y">Y. Bai</a>, <a href="/search/nucl-ex?searchtype=author&query=Bakina%2C+O">O. Bakina</a>, <a href="/search/nucl-ex?searchtype=author&query=Balossino%2C+I">I. Balossino</a>, <a href="/search/nucl-ex?searchtype=author&query=Ban%2C+Y">Y. Ban</a>, <a href="/search/nucl-ex?searchtype=author&query=Bao%2C+H+-">H. -R. Bao</a>, <a href="/search/nucl-ex?searchtype=author&query=Batozskaya%2C+V">V. Batozskaya</a>, <a href="/search/nucl-ex?searchtype=author&query=Begzsuren%2C+K">K. Begzsuren</a>, <a href="/search/nucl-ex?searchtype=author&query=Berger%2C+N">N. Berger</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlowski%2C+M">M. Berlowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertani%2C+M">M. Bertani</a>, <a href="/search/nucl-ex?searchtype=author&query=Bettoni%2C+D">D. Bettoni</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianchi%2C+F">F. Bianchi</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianco%2C+E">E. Bianco</a>, <a href="/search/nucl-ex?searchtype=author&query=Bortone%2C+A">A. Bortone</a>, <a href="/search/nucl-ex?searchtype=author&query=Boyko%2C+I">I. Boyko</a>, <a href="/search/nucl-ex?searchtype=author&query=Briere%2C+R+A">R. A. Briere</a> , et al. (637 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="2410.13515v1-abstract-short" style="display: inline;"> The study of beta decay of the charmed baryon provides unique insights into the fundamental mechanism of the strong and electro-weak interactions. The $螞_c^+$, being the lightest charmed baryon, undergoes disintegration solely through the charm quark weak decay. Its beta decay provides an ideal laboratory for investigating non-perturbative effects in quantum chromodynamics and for constraining the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.13515v1-abstract-full').style.display = 'inline'; document.getElementById('2410.13515v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.13515v1-abstract-full" style="display: none;"> The study of beta decay of the charmed baryon provides unique insights into the fundamental mechanism of the strong and electro-weak interactions. The $螞_c^+$, being the lightest charmed baryon, undergoes disintegration solely through the charm quark weak decay. Its beta decay provides an ideal laboratory for investigating non-perturbative effects in quantum chromodynamics and for constraining the fundamental parameters of the Cabibbo-Kobayashi-Maskawa matrix in weak interaction theory. This article presents the first observation of the Cabibbo-suppressed $螞_c^+$ beta decay into a neutron $螞_c^+ \rightarrow n e^+ 谓_{e}$, based on $4.5~\mathrm{fb}^{-1}$ of electron-positron annihilation data collected with the BESIII detector in the energy region above the $螞^+_c\bar螞^-_c$ threshold. A novel machine learning technique, leveraging Graph Neural Networks, has been utilized to effectively separate signals from dominant backgrounds, particularly $螞_c^+ \rightarrow 螞e^+ 谓_{e}$. This approach has yielded a statistical significance of more than $10蟽$. The absolute branching fraction of $螞_c^+ \rightarrow n e^+ 谓_{e}$ is measured to be $(3.57\pm0.34_{\mathrm{stat}}\pm0.14_{\mathrm{syst}})\times 10^{-3}$. For the first time, the CKM matrix element $\left|V_{cd}\right|$ is extracted via a charmed baryon decay to be $0.208\pm0.011_{\rm exp.}\pm0.007_{\rm LQCD}\pm0.001_{蟿_{螞_c^+}}$. This study provides a new probe to further understand fundamental interactions in the charmed baryon sector, and demonstrates the power of modern machine learning techniques in enhancing experimental capability in high energy physics research. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.13515v1-abstract-full').style.display = 'none'; document.getElementById('2410.13515v1-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> 17 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </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">28 pages, 6 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.09012">arXiv:2401.09012</a> <span> [<a href="https://arxiv.org/pdf/2401.09012">pdf</a>, <a href="https://arxiv.org/format/2401.09012">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="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> First study of antihyperon-nucleon scattering $\bar螞p\rightarrow\bar螞p$ and measurement of $螞p\rightarrow螞p$ cross section </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=BESIII+Collaboration"> BESIII Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Ablikim%2C+M">M. Ablikim</a>, <a href="/search/nucl-ex?searchtype=author&query=Achasov%2C+M+N">M. N. Achasov</a>, <a href="/search/nucl-ex?searchtype=author&query=Adlarson%2C+P">P. Adlarson</a>, <a href="/search/nucl-ex?searchtype=author&query=Afedulidis%2C+O">O. Afedulidis</a>, <a href="/search/nucl-ex?searchtype=author&query=Ai%2C+X+C">X. C. Ai</a>, <a href="/search/nucl-ex?searchtype=author&query=Aliberti%2C+R">R. Aliberti</a>, <a href="/search/nucl-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/nucl-ex?searchtype=author&query=An%2C+Q">Q. An</a>, <a href="/search/nucl-ex?searchtype=author&query=Bai%2C+Y">Y. Bai</a>, <a href="/search/nucl-ex?searchtype=author&query=Bakina%2C+O">O. Bakina</a>, <a href="/search/nucl-ex?searchtype=author&query=Balossino%2C+I">I. Balossino</a>, <a href="/search/nucl-ex?searchtype=author&query=Ban%2C+Y">Y. Ban</a>, <a href="/search/nucl-ex?searchtype=author&query=Bao%2C+H+-">H. -R. Bao</a>, <a href="/search/nucl-ex?searchtype=author&query=Batozskaya%2C+V">V. Batozskaya</a>, <a href="/search/nucl-ex?searchtype=author&query=Begzsuren%2C+K">K. Begzsuren</a>, <a href="/search/nucl-ex?searchtype=author&query=Berger%2C+N">N. Berger</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlowski%2C+M">M. Berlowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertani%2C+M">M. Bertani</a>, <a href="/search/nucl-ex?searchtype=author&query=Bettoni%2C+D">D. Bettoni</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianchi%2C+F">F. Bianchi</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianco%2C+E">E. Bianco</a>, <a href="/search/nucl-ex?searchtype=author&query=Bortone%2C+A">A. Bortone</a>, <a href="/search/nucl-ex?searchtype=author&query=Boyko%2C+I">I. Boyko</a>, <a href="/search/nucl-ex?searchtype=author&query=Briere%2C+R+A">R. A. Briere</a> , et al. (634 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="2401.09012v2-abstract-short" style="display: inline;"> Using $(10.087\pm0.044)\times10^{9}$ $J/蠄$ events collected with the BESIII detector at the BEPCII storage ring, the processes $螞p\rightarrow螞p$ and $\bar螞p\rightarrow\bar螞p$ are studied, where the $螞/\bar螞$ baryons are produced in the process $J/蠄\rightarrow螞\bar螞$ and the protons are the hydrogen nuclei in the cooling oil of the beam pipe. Clear signals are observed for the two reactions. The cr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.09012v2-abstract-full').style.display = 'inline'; document.getElementById('2401.09012v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.09012v2-abstract-full" style="display: none;"> Using $(10.087\pm0.044)\times10^{9}$ $J/蠄$ events collected with the BESIII detector at the BEPCII storage ring, the processes $螞p\rightarrow螞p$ and $\bar螞p\rightarrow\bar螞p$ are studied, where the $螞/\bar螞$ baryons are produced in the process $J/蠄\rightarrow螞\bar螞$ and the protons are the hydrogen nuclei in the cooling oil of the beam pipe. Clear signals are observed for the two reactions. The cross sections in $-0.9\leq\rm{cos}胃_{螞/\bar螞}\leq0.9$ are measured to be $蟽(螞p\rightarrow螞p)=(12.2\pm1.6_{\rm{stat}}\pm1.1_{\rm{sys}})$ mb and $蟽(\bar螞 p\rightarrow\bar螞 p)=(17.5\pm2.1_{\rm{stat}}\pm1.6_{\rm{sys}})$ mb at the $螞/\bar螞$ momentum of $1.074$ GeV/$c$ within a range of $\pm0.017$ GeV/$c$, where the $胃_{螞/\bar螞}$ are the scattering angles of the $螞/\bar螞$ in the $螞p/\bar螞p$ rest frames. Furthermore, the differential cross sections of the two reactions are also measured, where there is a slight tendency of forward scattering for $螞p\rightarrow螞p$, and a strong forward peak for $\bar螞p\rightarrow\bar螞p$. We present an approach to extract the total elastic cross sections by extrapolation. The study of $\bar螞p\rightarrow\bar螞p$ represents the first study of antihyperon-nucleon scattering, and these new measurements will serve as important inputs for the theoretical understanding of the (anti)hyperon-nucleon interaction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.09012v2-abstract-full').style.display = 'none'; document.getElementById('2401.09012v2-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> 18 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2024. </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">9 pages, 5 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2310.00720">arXiv:2310.00720</a> <span> [<a href="https://arxiv.org/pdf/2310.00720">pdf</a>, <a href="https://arxiv.org/format/2310.00720">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</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/PhysRevC.109.L052201">10.1103/PhysRevC.109.L052201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First measurement of $螞N$ inelastic scattering with $螞$ from $e^{+} e^{-} \rightarrow J/蠄\to 螞\bar螞$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=BESIII+Collaboration"> BESIII Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Ablikim%2C+M">M. Ablikim</a>, <a href="/search/nucl-ex?searchtype=author&query=Achasov%2C+M+N">M. N. Achasov</a>, <a href="/search/nucl-ex?searchtype=author&query=Adlarson%2C+P">P. Adlarson</a>, <a href="/search/nucl-ex?searchtype=author&query=Afedulidis%2C+O">O. Afedulidis</a>, <a href="/search/nucl-ex?searchtype=author&query=Ai%2C+X+C">X. C. Ai</a>, <a href="/search/nucl-ex?searchtype=author&query=Aliberti%2C+R">R. Aliberti</a>, <a href="/search/nucl-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/nucl-ex?searchtype=author&query=An%2C+Q">Q. An</a>, <a href="/search/nucl-ex?searchtype=author&query=Bai%2C+Y">Y. Bai</a>, <a href="/search/nucl-ex?searchtype=author&query=Bakina%2C+O">O. Bakina</a>, <a href="/search/nucl-ex?searchtype=author&query=Balossino%2C+I">I. Balossino</a>, <a href="/search/nucl-ex?searchtype=author&query=Ban%2C+Y">Y. Ban</a>, <a href="/search/nucl-ex?searchtype=author&query=Bao%2C+H+-">H. -R. Bao</a>, <a href="/search/nucl-ex?searchtype=author&query=Batozskaya%2C+V">V. Batozskaya</a>, <a href="/search/nucl-ex?searchtype=author&query=Begzsuren%2C+K">K. Begzsuren</a>, <a href="/search/nucl-ex?searchtype=author&query=Berger%2C+N">N. Berger</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlowski%2C+M">M. Berlowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertani%2C+M">M. Bertani</a>, <a href="/search/nucl-ex?searchtype=author&query=Bettoni%2C+D">D. Bettoni</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianchi%2C+F">F. Bianchi</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianco%2C+E">E. Bianco</a>, <a href="/search/nucl-ex?searchtype=author&query=Bortone%2C+A">A. Bortone</a>, <a href="/search/nucl-ex?searchtype=author&query=Boyko%2C+I">I. Boyko</a>, <a href="/search/nucl-ex?searchtype=author&query=Briere%2C+R+A">R. A. Briere</a> , et al. (626 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="2310.00720v1-abstract-short" style="display: inline;"> Using an $e^+ e^-$ collision data sample of $(10087 \pm 44)\times10^6 ~J/蠄$ events taken at the center-of-mass energy of $3.097~\rm{GeV}$ by the BESIII detector at the BEPCII collider, the process $螞+N \rightarrow 危^+ + X$ is studied for the first time employing a novel method. The $危^{+}$ hyperons are produced by the collisions of $螞$ hyperons from $J/蠄$ decays with nuclei in the material of the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.00720v1-abstract-full').style.display = 'inline'; document.getElementById('2310.00720v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2310.00720v1-abstract-full" style="display: none;"> Using an $e^+ e^-$ collision data sample of $(10087 \pm 44)\times10^6 ~J/蠄$ events taken at the center-of-mass energy of $3.097~\rm{GeV}$ by the BESIII detector at the BEPCII collider, the process $螞+N \rightarrow 危^+ + X$ is studied for the first time employing a novel method. The $危^{+}$ hyperons are produced by the collisions of $螞$ hyperons from $J/蠄$ decays with nuclei in the material of the BESIII detector. The total cross section of $螞+ ^{9}{\rm Be} \rightarrow 危^+ + X$ is measured to be $蟽= (37.3 \pm 4.7 \pm 3.5)~{\rm mb}$ at $螞$ beam momenta within $[1.057, 1.091]~{\rm GeV}/c$, where the uncertainties are statistical and systematic, respectively. This analysis is the first study of $螞$-nucleon interactions at an $e^+ e^-$ collider, providing information and constraints relevant for the strong-interaction potential, the origin of color confinement, the unified model for baryon-baryon interactions, and the internal structure of neutron stars. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.00720v1-abstract-full').style.display = 'none'; document.getElementById('2310.00720v1-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> 1 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2023. </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 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