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In this reference frame, the parton model hard interactions between a quark and an exchanged boson defines the coordinate system such that the struck quark is back-scattered along the virtual photon momentum direction. In Quantum Chromodynamics (QCD), higher order perturbative or non-perturbative effects can change this picture drastically. As Bjorken-x decreases below one half, a rather peculiar event signature is predicted with increasing probability, where no radiation is present in one of the two Breit-frame hemispheres and all emissions are to be found in the other hemisphere. At higher orders in $\alpha _{s}$ or in the presence of soft QCD effects, predictions of the rate of these events are far from trivial, and that motivates measurements with real data. We report on the first observation of the empty current hemisphere events in electron–proton collisions at the HERA collider using data recorded with the H1 detector at a center-of-mass energy of 319 GeV. The fraction of inclusive neutral-current DIS events with an empty hemisphere is found to be $0.0112 \pm 3.9\%_\text {stat} \pm 4.5\%_{\text {syst}} \pm 1.6\%_{\text {mod}}$ in the selected kinematic region of $150<Q^{2} <1500\, \textrm{GeV}^2 $ and inelasticity $0.14<y<0.7$. The data sample corresponds to an integrated luminosity of 351.1 pb${}^{-1}$, sufficient to enable differential cross section measurements of these events. The results show an enhanced discriminating power at lower Bjorken-x among different Monte Carlo event generator predictions. The Breit frame provides a natural frame to analyze lepton-proton scattering events. In this reference frame, the parton model hard interactions between a quark and an exchanged boson defines the coordinate system such that the struck quark is back-scattered along the virtual photon momentum direction. In Quantum Chromodynamics (QCD), higher order perturbative or non-perturbative effects can change this picture drastically. As Bjorken-$x$ decreases below one half, a rather peculiar event signature is predicted with increasing probability, where no radiation is present in one of the two Breit-frame hemispheres and all emissions are to be found in the other hemisphere. At higher orders in $\alpha_s$ or in the presence of soft QCD effects, predictions of the rate of these events are far from trivial, and that motivates measurements with real data. We report on the first observation of the empty current hemisphere events in electron-proton collisions at the HERA collider using data recorded with the H1 detector at a center-of-mass energy of 319 GeV. The fraction of inclusive neutral-current DIS events with an empty hemisphere is found to be $0.0112 \pm 3.9\,\%_\text{stat} \pm 4.5\,\%_\text{syst} \pm 1.6\,\%_\text{mod}$ in the selected kinematic region of $150< Q^2<1500$ GeV$^2$ and inelasticity $0.14< y<0.7$. The data sample corresponds to an integrated luminosity of 351.1 pb$^{-1}$, sufficient to enable differential cross section measurements of these events. The results show an enhanced discriminating power at lower Bjorken-$x$ among different Monte Carlo event generator predictions. Andreev, V.; Arratia, M.; Baghdasaryan, A.; Baty, A.; Begzsuren, K.; Bolz, A.; Boudry, V.; Brandt, G.; Britzger, D.; Buniatyan, A.; Bystritskaya, L.; Campbell, A.J.; Cantun Avila, K.B.; Cerny, K.; Chekelian, V.; Chen, Z.; Contreras, J.G.; Cvach, J.; Dainton, J.B.; Daum, K.; Deshpande, A.; Diaconu, C.; Drees, A.; Eckerlin, G.; Egli, S.; Elsen, E.; Favart, L.; Fedotov, A.; Feltesse, J.; Fleischer, M.; Fomenko, A.; Gal, C.; Gayler, J.; Goerlich, L.; Gogitidze, N.; Gouzevitch, M.; Grab, C.; Greenshaw, T.; Grindhammer, G.; Haidt, D.; Henderson, R.C. W.; Hessler, J.; Hladký, J.; Hoffmann, D.; Horisberger, R.; Hreus, T.; Huber, F.; Jacobs, P.M.; Jacquet, M.; Janssen, T.; Jung, A.W.; Katzy, J.; Kiesling, C.; Klein, M.; Kleinwort, C.; Klest, H.T.; Kluth, S.; Kogler, R.; Kostka, P.; Kretzschmar, J.; Krücker, D.; Krüger, K.; Landon, M.P. J.; Lange, W.; Laycock, P.; Lee, S.H.; Levonian, S.; Li, W.; Lin, J.; Lipka, K.; List, B.; List, J.; Lobodzinski, B.; Long, O.R.; Malinovski, E.; Martyn, H.-U.; Maxfield, S.J.; Mehta, A.; Meyer, A.B.; Meyer, J.; Mikocki, S.; Mikuni, V.M.; Mondal, M.M.; Müller, K.; Nachman, B.; Naumann, Th.; Newman, P.R.; Niebuhr, C.; Nowak, G.; Olsson, J.E.; Ozerov, D.; Park, S.; Pascaud, C.; Patel, G.D.; Perez, E.; Petrukhin, A.; Picuric, I.; Pitzl, D.; Polifka, R.; Preins, S.; Radescu, V.; Raicevic, N.; Ravdandorj, T.; Reichelt, D.; Reimer, P.; Rizvi, E.; Robmann, P.; Roosen, R.; Rostovtsev, A.; Rotaru, M.; Sankey, D.P. 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In this reference frame, the parton model hard interactions between a quark and an exchanged boson defines the coordinate system such that the struck quark is back-scattered along the virtual photon momentum direction. In Quantum Chromodynamics (QCD), higher order perturbative or non-perturbative effects can change this picture drastically. As Bjorken-x decreases below one half, a rather peculiar event signature is predicted with increasing probability, where no radiation is present in one of the two Breit-frame hemispheres and all emissions are to be found in the other hemisphere. At higher orders in $\alpha _{s}$ or in the presence of soft QCD effects, predictions of the rate of these events are far from trivial, and that motivates measurements with real data. We report on the first observation of the empty current hemisphere events in electron–proton collisions at the HERA collider using data recorded with the H1 detector at a center-of-mass energy of 319 GeV. The fraction of inclusive neutral-current DIS events with an empty hemisphere is found to be $0.0112 \pm 3.9\%_\text {stat} \pm 4.5\%_{\text {syst}} \pm 1.6\%_{\text {mod}}$ in the selected kinematic region of $150&lt;Q^{2} &lt;1500\, \textrm{GeV}^2 $ and inelasticity $0.14&lt;y&lt;0.7$. The data sample corresponds to an integrated luminosity of 351.1 pb${}^{-1}$, sufficient to enable differential cross section measurements of these events. The results show an enhanced discriminating power at lower Bjorken-x among different Monte Carlo event generator predictions." property="og:description" /> <meta content="Springer" property="og:description" /> <meta content="arXiv" property="og:description" /> <meta content="The Breit frame provides a natural frame to analyze lepton-proton scattering events. In this reference frame, the parton model hard interactions between a quark and an exchanged boson defines the coordinate system such that the struck quark is back-scattered along the virtual photon momentum direction. In Quantum Chromodynamics (QCD), higher order perturbative or non-perturbative effects can change this picture drastically. As Bjorken-$x$ decreases below one half, a rather peculiar event signature is predicted with increasing probability, where no radiation is present in one of the two Breit-frame hemispheres and all emissions are to be found in the other hemisphere. At higher orders in $\alpha_s$ or in the presence of soft QCD effects, predictions of the rate of these events are far from trivial, and that motivates measurements with real data. We report on the first observation of the empty current hemisphere events in electron-proton collisions at the HERA collider using data recorded with the H1 detector at a center-of-mass energy of 319 GeV. The fraction of inclusive neutral-current DIS events with an empty hemisphere is found to be $0.0112 \pm 3.9\,\%_\text{stat} \pm 4.5\,\%_\text{syst} \pm 1.6\,\%_\text{mod}$ in the selected kinematic region of $150&lt; Q^2&lt;1500$ GeV$^2$ and inelasticity $0.14&lt; y&lt;0.7$. The data sample corresponds to an integrated luminosity of 351.1 pb$^{-1}$, sufficient to enable differential cross section measurements of these events. The results show an enhanced discriminating power at lower Bjorken-$x$ among different Monte Carlo event generator predictions." property="og:description" />  <meta content="summary" name="twitter:card" /> <style></style> </head> <body class="CERN32Document32Server search" lang="ka">  <div id="cern-toolbar"> <h1><a href="http://cern.ch" title="CERN">CERN <span>Accelerating science</span></a></h1> <ul> <li class="cern-accountlinks"><a class="cern-account" href="https://cds.cern.ch/youraccount/login?ln=ka&referer=https%3A//cds.cern.ch/record/2892377%3Fln%3Dka" title="Sign in to your CERN account">Sign in</a></li> <li><a class="cern-directory" href="http://cern.ch/directory" title="Search CERN resources and browse the directory">Directory</a></li> </ul> </div>   <div role="banner" class="clearfix" id="header"> <div class="header-inner inner"> <hgroup class="clearfix"> <h2 id="site-name"> <a rel="home" title="Home" href="/"><span>CERN Document Server</span></a> </h2> <h3 id="site-slogan">Access articles, reports and multimedia content in HEP</h3> </hgroup> <div role="navigation" id="main-navigation" class="cdsmenu"> <h2 class="element-invisible">Main menu</h2><ul class="links inline clearfix"> <li class="menu-386 first active-trail"><a class="active-trail" href="https://cds.cern.ch/?ln=ka">ძებნა</a></li> <li class="menu-444 "><a class="" title="" href="https://cds.cern.ch/submit?ln=ka">დაყენება</a></li> <li class="menu-426 "><a class="" href="https://cds.cern.ch/help/?ln=ka">დახმარება</a></li> <li class="leaf hassubcdsmenu"> <a hreflang="en" class="header" href="https://cds.cern.ch/youraccount/display?ln=ka">პერს</a> <ul class="subsubcdsmenu"><li><a href="https://cds.cern.ch/youralerts/list?ln=ka">თქვენი ცვლილებები</a></li><li><a href="https://cds.cern.ch/yourbaskets/display?ln=ka">თქვენი კალათები</a></li><li><a href="https://cds.cern.ch/yourcomments?ln=ka">Your comments</a></li><li><a href="https://cds.cern.ch/youralerts/display?ln=ka">თქვენი ძებნა</a></li></ul></li> </ul> </div> </div> </div>  <table class="navtrailbox"> <tr> <td class="navtrailboxbody"> <a href="/?ln=ka" class="navtrail">მთავარი</a> > Observation and differential cross section measurement of neutral current DIS events with an empty hemisphere in the Breit frame </td> </tr> </table> </div> <div class="pagebody"><div class="pagebodystripemiddle"> <div class="detailedrecordbox"> <div class="detailedrecordtabs"> <div> <ul class="detailedrecordtabs"><li class="on first"><a href="/record/2892377/?ln=ka">ინფორმაცია </a></li><li class=""><a href="/record/2892377/files?ln=ka">Files </a></li></ul> <div id="tabsSpacer" style="clear:both;height:0px"> </div></div> </div> <div class="detailedrecordboxcontent"> <div class="top-left-folded"></div> <div class="top-right-folded"></div> <div class="inside">  <abbr class="unapi-id" title="2892377"></abbr> <style type="text/css">  </style> <table class="formatRecordTableFullWidth" > <tr> <td class="formatRecordHeader" style="background-image: url('https://cds.cern.ch/img/journals.jpg');" colspan="2">  Article </td> </tr> <script type="text/javascript"> $( document ).ready(function() { $('.showAuthor').on('click', function() { var author = '<p>' + $(this).data('name') + '</p>'; var affiliation = $(this).data('affiliation') + '</br>'; var contribution = $(this).data('contribution') + '</br>'; $.magnificPopup.open({ items: { src: '<div id="ovelary-mathjax" class="overlay-white oc-content overlay-white-500">' + author + affiliation + contribution + '</div>', type: 'inline' }, callbacks: { open: function() { var div = document.getElementById("overlay-mathjax") MathJax.Hub.Queue(["Typeset", MathJax.Hub, div]); }, } }) }) }); </script> <tr><td class="formatRecordLabel"> Report number </td><td style="padding-left:5px;"><a href="http://arxiv.org/abs/arXiv:2403.08982">arXiv:2403.08982</a> ; DESY-24-034</td></tr> <tr><td class="formatRecordLabel"> Title </td><td style="padding-left:5px;"><b>Observation and differential cross section measurement of neutral current DIS events with an empty hemisphere in the Breit frame</b></td></tr> <tr><td class="formatRecordLabel"><span style="white-space:nowrap;"> Author(s) </span> </td><td style="padding-left:5px;"> <script type="text/javascript"> function toggle_authors_visibility(){ var more = document.getElementById('more'); var link = document.getElementById('link'); var extension = document.getElementById('extension'); if (more.style.display=='none'){ more.style.display = ''; extension.style.display = 'none'; link.innerHTML = "დამალვა" } else { more.style.display = 'none'; extension.style.display = ''; link.innerHTML = "ყველა 148 ავტორის ჩვენება " } link.style.color = "rgb(204,0,0);" } function set_up(){ var extension = document.getElementById('extension'); extension.innerHTML = "H1 Collaboration "; toggle_authors_visibility(); } </script> <a name="show_hide" /><p id="more" style=""><a href="https://cds.cern.ch/search?f=author&p=Andreev%2C%20V.&ln=ka">Andreev, V.</a> (Unlisted) ; <a href="https://cds.cern.ch/search?f=author&p=Arratia%2C%20M.&ln=ka">Arratia, M.</a> (UC, Riverside) ; <a href="https://cds.cern.ch/search?f=author&p=Baghdasaryan%2C%20A.&ln=ka">Baghdasaryan, A.</a> (Yerevan Phys. Inst.) ; <a href="https://cds.cern.ch/search?f=author&p=Baty%2C%20A.&ln=ka">Baty, A.</a> (Illinois U., Chicago) ; <a href="https://cds.cern.ch/search?f=author&p=Begzsuren%2C%20K.&ln=ka">Begzsuren, K.</a> (Ulaanbaatar U.) ; <a href="https://cds.cern.ch/search?f=author&p=Bolz%2C%20A.&ln=ka">Bolz, A.</a> (DESY, Zeuthen) ; <a href="https://cds.cern.ch/search?f=author&p=Boudry%2C%20V.&ln=ka">Boudry, V.</a> (Ecole Polytechnique) ; <a href="https://cds.cern.ch/search?f=author&p=Brandt%2C%20G.&ln=ka">Brandt, G.</a> (Gottingen U., II. Phys. Inst.) ; <a href="https://cds.cern.ch/search?f=author&p=Britzger%2C%20D.&ln=ka">Britzger, D.</a> (Munich, Max Planck Inst.) ; <a href="https://cds.cern.ch/search?f=author&p=Buniatyan%2C%20A.&ln=ka">Buniatyan, A.</a> (Birmingham U.) ; <a href="https://cds.cern.ch/search?f=author&p=Bystritskaya%2C%20L.&ln=ka">Bystritskaya, L.</a> (Unlisted) ; <a href="https://cds.cern.ch/search?f=author&p=Campbell%2C%20A.J.&ln=ka">Campbell, A.J.</a> (DESY, Zeuthen) ; <a href="https://cds.cern.ch/search?f=author&p=Cantun%20Avila%2C%20K.B.&ln=ka">Cantun Avila, K.B.</a> (Merida, IPN) ; <a href="https://cds.cern.ch/search?f=author&p=Cerny%2C%20K.&ln=ka">Cerny, K.</a> (Palacky U.) ; <a href="https://cds.cern.ch/search?f=author&p=Chekelian%2C%20V.&ln=ka">Chekelian, V.</a> (Munich, Max Planck Inst.) ; <a href="https://cds.cern.ch/search?f=author&p=Chen%2C%20Z.&ln=ka">Chen, Z.</a> (Shandong U.) ; <a href="https://cds.cern.ch/search?f=author&p=Contreras%2C%20J.G.&ln=ka">Contreras, J.G.</a> (Merida, IPN) ; <a href="https://cds.cern.ch/search?f=author&p=Cvach%2C%20J.&ln=ka">Cvach, J.</a> (Prague, Inst. Phys.) ; <a href="https://cds.cern.ch/search?f=author&p=Dainton%2C%20J.B.&ln=ka">Dainton, J.B.</a> (Liverpool U.) ; <a href="https://cds.cern.ch/search?f=author&p=Daum%2C%20K.&ln=ka">Daum, K.</a> (Wuppertal U.) ; <a href="https://cds.cern.ch/search?f=author&p=Deshpande%2C%20A.&ln=ka">Deshpande, A.</a> (Stony Brook U. ; Brookhaven Natl. Lab.) ; <a href="https://cds.cern.ch/search?f=author&p=Diaconu%2C%20C.&ln=ka">Diaconu, C.</a> (Marseille, CPPM) ; <a href="https://cds.cern.ch/search?f=author&p=Drees%2C%20A.&ln=ka">Drees, A.</a> (Stony Brook U.) ; <a href="https://cds.cern.ch/search?f=author&p=Eckerlin%2C%20G.&ln=ka">Eckerlin, G.</a> (DESY, Zeuthen) ; <a href="https://cds.cern.ch/search?f=author&p=Egli%2C%20S.&ln=ka">Egli, S.</a> (PSI, Villigen) ; <a href="https://cds.cern.ch/search?f=author&p=Elsen%2C%20E.&ln=ka">Elsen, E.</a> (DESY, Zeuthen) ; <a href="https://cds.cern.ch/search?f=author&p=Favart%2C%20L.&ln=ka">Favart, L.</a> (Brussels U., IIHE) ; <a href="https://cds.cern.ch/search?f=author&p=Fedotov%2C%20A.&ln=ka">Fedotov, A.</a> (Unlisted) ; <a href="https://cds.cern.ch/search?f=author&p=Feltesse%2C%20J.&ln=ka">Feltesse, J.</a> (IRFU, Saclay) ; <a href="https://cds.cern.ch/search?f=author&p=Fleischer%2C%20M.&ln=ka">Fleischer, M.</a> (DESY, Zeuthen) ; <a href="https://cds.cern.ch/search?f=author&p=Fomenko%2C%20A.&ln=ka">Fomenko, A.</a> (Unlisted) ; <a href="https://cds.cern.ch/search?f=author&p=Gal%2C%20C.&ln=ka">Gal, C.</a> (Stony Brook U.) ; <a href="https://cds.cern.ch/search?f=author&p=Gayler%2C%20J.&ln=ka">Gayler, J.</a> (DESY, Zeuthen) ; <a href="https://cds.cern.ch/search?f=author&p=Goerlich%2C%20L.&ln=ka">Goerlich, L.</a> (Cracow, INP) ; <a href="https://cds.cern.ch/search?f=author&p=Gogitidze%2C%20N.&ln=ka">Gogitidze, N.</a> (DESY, Zeuthen) ; <a href="https://cds.cern.ch/search?f=author&p=Gouzevitch%2C%20M.&ln=ka">Gouzevitch, M.</a> (Unlisted) ; <a href="https://cds.cern.ch/search?f=author&p=Grab%2C%20C.&ln=ka">Grab, C.</a> (Zurich, ETH) ; <a href="https://cds.cern.ch/search?f=author&p=Greenshaw%2C%20T.&ln=ka">Greenshaw, T.</a> (Liverpool U.) ; <a href="https://cds.cern.ch/search?f=author&p=Grindhammer%2C%20G.&ln=ka">Grindhammer, G.</a> (Munich, Max Planck Inst.) ; <a href="https://cds.cern.ch/search?f=author&p=Haidt%2C%20D.&ln=ka">Haidt, D.</a> (DESY, Zeuthen) ; <a href="https://cds.cern.ch/search?f=author&p=Henderson%2C%20R.C.%20W.&ln=ka">Henderson, R.C. W.</a> (Lancaster U.) ; <a href="https://cds.cern.ch/search?f=author&p=Hessler%2C%20J.&ln=ka">Hessler, J.</a> (Munich, Max Planck Inst.) ; <a href="https://cds.cern.ch/search?f=author&p=Hladk%C3%BD%2C%20J.&ln=ka">Hladký, J.</a> (Prague, Inst. Phys.) ; <a href="https://cds.cern.ch/search?f=author&p=Hoffmann%2C%20D.&ln=ka">Hoffmann, D.</a> (Marseille, CPPM) ; <a href="https://cds.cern.ch/search?f=author&p=Horisberger%2C%20R.&ln=ka">Horisberger, R.</a> (PSI, Villigen) ; <a href="https://cds.cern.ch/search?f=author&p=Hreus%2C%20T.&ln=ka">Hreus, T.</a> (Zurich U.) ; <a href="https://cds.cern.ch/search?f=author&p=Huber%2C%20F.&ln=ka">Huber, F.</a> (Heidelberg U.) ; <a href="https://cds.cern.ch/search?f=author&p=Jacobs%2C%20P.M.&ln=ka">Jacobs, P.M.</a> (LBL, Berkeley) ; <a href="https://cds.cern.ch/search?f=author&p=Jacquet%2C%20M.&ln=ka">Jacquet, M.</a> (IJCLab, Orsay) ; <a href="https://cds.cern.ch/search?f=author&p=Janssen%2C%20T.&ln=ka">Janssen, T.</a> (Brussels U., IIHE) ; <a href="https://cds.cern.ch/search?f=author&p=Jung%2C%20A.W.&ln=ka">Jung, A.W.</a> (Purdue U.) ; <a href="https://cds.cern.ch/search?f=author&p=Katzy%2C%20J.&ln=ka">Katzy, J.</a> (DESY, Zeuthen) ; <a href="https://cds.cern.ch/search?f=author&p=Kiesling%2C%20C.&ln=ka">Kiesling, C.</a> (Munich, Max Planck Inst.) ; <a href="https://cds.cern.ch/search?f=author&p=Klein%2C%20M.&ln=ka">Klein, M.</a> (Liverpool U.) ; <a href="https://cds.cern.ch/search?f=author&p=Kleinwort%2C%20C.&ln=ka">Kleinwort, C.</a> (DESY, Zeuthen) ; <a href="https://cds.cern.ch/search?f=author&p=Klest%2C%20H.T.&ln=ka">Klest, H.T.</a> (Stony Brook U. ; Argonne, PHY) ; <a href="https://cds.cern.ch/search?f=author&p=Kluth%2C%20S.&ln=ka">Kluth, S.</a> (Munich, Max Planck Inst.) ; <a href="https://cds.cern.ch/search?f=author&p=Kogler%2C%20R.&ln=ka">Kogler, R.</a> (DESY, Zeuthen) ; <a href="https://cds.cern.ch/search?f=author&p=Kostka%2C%20P.&ln=ka">Kostka, P.</a> (Liverpool U.) ; <a href="https://cds.cern.ch/search?f=author&p=Kretzschmar%2C%20J.&ln=ka">Kretzschmar, J.</a> (Liverpool U.) ; <a href="https://cds.cern.ch/search?f=author&p=Kr%C3%BCcker%2C%20D.&ln=ka">Krücker, D.</a> (DESY, Zeuthen) ; <a href="https://cds.cern.ch/search?f=author&p=Kr%C3%BCger%2C%20K.&ln=ka">Krüger, K.</a> (DESY, Zeuthen) ; <a href="https://cds.cern.ch/search?f=author&p=Landon%2C%20M.P.%20J.&ln=ka">Landon, M.P. J.</a> (Queen Mary, U. of London) ; <a href="https://cds.cern.ch/search?f=author&p=Lange%2C%20W.&ln=ka">Lange, W.</a> (DESY, Zeuthen) ; <a href="https://cds.cern.ch/search?f=author&p=Laycock%2C%20P.&ln=ka">Laycock, P.</a> (Brookhaven Natl. 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Inst.) ; <a href="https://cds.cern.ch/search?f=author&p=Zomer%2C%20F.&ln=ka">Zomer, F.</a> (IJCLab, Orsay)</p> <span id="extension"></span> <small><i><a id="link" href="#" onclick="toggle_authors_visibility()" style="color:rgb(204,0,0);"></a></i></small><script type="text/javascript">set_up()</script></td></tr> <tr><td class="formatRecordLabel"> Publication </td><td style="padding-left:5px;">2024-07-22</td></tr> <tr><td class="formatRecordLabel"> Imprint </td><td style="padding-left:5px;">2024-03-13</td></tr> <tr><td class="formatRecordLabel"> Number of pages </td><td style="padding-left:5px;">13</td></tr> <tr><td class="formatRecordLabel"> Note </td><td style="padding-left:5px;">13 pages, 5 figures, 2 Tables. This version as accepted for publication</td></tr> <tr><td class="formatRecordLabel"> In: </td><td style="padding-left:5px;"><a href="http://dx.doi.org/10.1140/epjc/s10052-024-13003-1"><i>Eur. Phys. J. C</i> 84 (2024) 720</a> </a></td></tr> <tr><td class="formatRecordLabel"> DOI </td><td style="padding-left:5px;"><a href="http://dx.doi.org/10.1140/epjc/s10052-024-13003-1" title="DOI" target="_blank">10.1140/epjc/s10052-024-13003-1</a> <tr><td class="formatRecordLabel"> Subject category </td><td style="padding-left:5px;">nucl-ex ; Nuclear Physics - Experiment ; hep-ph ; Particle Physics - Phenomenology ; hep-ex ; Particle Physics - Experiment</td></tr> <tr><td class="formatRecordLabel"> Accelerator/Facility, Experiment </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/search?p=DESY%20HERA%20H1&f=693__a">DESY HERA H1</a></td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">The Breit frame provides a natural frame to analyze lepton-proton scattering events. In this reference frame, the parton model hard interactions between a quark and an exchanged boson defines the coordinate system such that the struck quark is back-scattered along the virtual photon momentum direction. In Quantum Chromodynamics (QCD), higher order perturbative or non-perturbative effects can change this picture drastically. As Bjorken-$x$ decreases below one half, a rather peculiar event signature is predicted with increasing probability, where no radiation is present in one of the two Breit-frame hemispheres and all emissions are to be found in the other hemisphere. At higher orders in $\alpha_s$ or in the presence of soft QCD effects, predictions of the rate of these events are far from trivial, and that motivates measurements with real data. We report on the first observation of the empty current hemisphere events in electron-proton collisions at the HERA collider using data recorded with the H1 detector at a center-of-mass energy of 319 GeV. The fraction of inclusive neutral-current DIS events with an empty hemisphere is found to be $0.0112 \pm 3.9\,\%_\text{stat} \pm 4.5\,\%_\text{syst} \pm 1.6\,\%_\text{mod}$ in the selected kinematic region of $150< Q^2<1500$ GeV$^2$ and inelasticity $0.14< y<0.7$. The data sample corresponds to an integrated luminosity of 351.1 pb$^{-1}$, sufficient to enable differential cross section measurements of these events. The results show an enhanced discriminating power at lower Bjorken-$x$ among different Monte Carlo event generator predictions.</td></tr> <tr><td class="formatRecordLabel"> Copyright/License </td><td style="padding-left:5px;">preprint: (License: <a href="http://arxiv.org/licenses/nonexclusive-distrib/1.0/">arXiv nonexclusive-distrib 1.0</a>)<br/>publication: © 2024 The Author(s) (License: <a href="http://creativecommons.org/licenses/by/4.0/">CC-BY-4.0</a>), sponsored by <a href="http://scoap3.org">SCOAP³</a></td></tr> </table> <br/>Corresponding record in: <a href="http://inspirehep.net/record/2768737">Inspire</a> <small> </small> <br/> <br/><br/><div align="right"><div style="padding-bottom:2px;padding-top:30px;"><span class="moreinfo" style="margin-right:10px;"> <a href="" class="moreinfo">Back to search</a> </span></div></div> <div class="bottom-left-folded"><div class="recordlastmodifiedbox" style="position:relative;margin-left:1px"> ჩანაწერი შექმნილია 2024-03-21, ბოლოს შესწორებულია 2024-08-05</div></div> <div class="bottom-right-folded" style="text-align:right;padding-bottom:2px;"> <span class="moreinfo" style="margin-right:10px;"><a href="/search?ln=ka&p=recid%3A2892377&rm=wrd" class="moreinfo">მსგავსი ჩანაწერები</a></span></div> </div> </div> </div> <br/> <br /> <div class="detailedrecordminipanel"> <div class="top-left"></div><div class="top-right"></div> <div class="inside"> <div id="detailedrecordminipanelfile" style="width:33%;float:left;text-align:center;margin-top:0"> <div><small class="detailedRecordActions">სრული ტექსტი:</small> <br /><em>2403.08982</em> - <a href="/record/2892377/files/2403.08982.pdf"><img style="border:none" src="/img/file-icon-text-12x16.gif" alt="სრული ტექსტის ჩამოტვირთვა"/>PDF</a><br /><em>document</em> - <a href="/record/2892377/files/document.pdf"><img style="border:none" src="/img/file-icon-text-12x16.gif" alt="სრული ტექსტის ჩამოტვირთვა"/>PDF</a><br /></div> </div> <div id="detailedrecordminipanelreview" style="width:30%;float:left;text-align:center"> </div> <div id="detailedrecordminipanelactions" style="width:36%;float:right;text-align:right;"> <ul class="detailedrecordactions"> <li><a href="/yourbaskets/add?ln=ka&recid=2892377">პირად კალათაში დამატება</a></li> <li>ექსპორტირება <a style="text-decoration:underline;font-weight:normal" href="/record/2892377/export/hx?ln=ka">BibTeX</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2892377/export/hm?ln=ka">MARC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2892377/export/xm?ln=ka">MARCXML</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2892377/export/xd?ln=ka">DC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2892377/export/xe?ln=ka">EndNote</a>,  <a style="text-decoration:underline;font-weight:normal" href="/record/2892377/export/xn?ln=ka">NLM</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2892377/export/xw?ln=ka">RefWorks</a> </li> </ul> <div style='padding-left: 13px;'>  <div id="bookmark"></div> <div id="bookmark_sciencewise"></div> <style type="text/css"> #bookmark_sciencewise, #bookmark {float: left;} #bookmark_sciencewise li {padding: 2px; width: 25px;} #bookmark_sciencewise ul, #bookmark ul {list-style-image: none;} </style> <script type="text/javascript" src="/js/jquery.bookmark.min.js"></script> <style type="text/css">@import "/css/jquery.bookmark.css";</style> <script type="text/javascript">// <![CDATA[ $.bookmark.addSite('sciencewise', 'ScienceWise.info', 'https://cds.cern.ch/img/sciencewise.png', 'en', 'bookmark', 'http://sciencewise.info/bookmarks/2403.0898/add'); $('#bookmark_sciencewise').bookmark({sites: ['sciencewise']}); $('#bookmark').bookmark({ sites: ['facebook', 'twitter', 'linkedin', 'google_plusone'], icons: '/img/bookmarks.png', url: 'https://cds.cern.ch/record/2892377', addEmail: true, title: "Observation and differential cross section measurement of neutral current DIS events with an empty hemisphere in the Breit frame", description: "The Breit frame provides a natural frame to analyze lepton\u2013proton scattering events. In this reference frame, the parton model hard interactions between a quark and an exchanged boson defines the coordinate system such that the struck quark is back-scattered along the virtual photon momentum direction. In Quantum Chromodynamics (QCD), higher order perturbative or non-perturbative effects can change this picture drastically. As Bjorken-x decreases below one half, a rather peculiar event signature is predicted with increasing probability, where no radiation is present in one of the two Breit-frame hemispheres and all emissions are to be found in the other hemisphere. At higher orders in $\\alpha _{s}$ or in the presence of soft QCD effects, predictions of the rate of these events are far from trivial, and that motivates measurements with real data. We report on the first observation of the empty current hemisphere events in electron\u2013proton collisions at the HERA collider using data recorded with the H1 detector at a center-of-mass energy of 319 GeV. The fraction of inclusive neutral-current DIS events with an empty hemisphere is found to be $0.0112 \\pm 3.9\\%_\\text {stat} \\pm 4.5\\%_{\\text {syst}} \\pm 1.6\\%_{\\text {mod}}$ in the selected kinematic region of $150<Q^{2} <1500\\, \\textrm{GeV}^2 $ and inelasticity $0.14<y<0.7$. The data sample corresponds to an integrated luminosity of 351.1\u00a0pb${}^{-1}$, sufficient to enable differential cross section measurements of these events. The results show an enhanced discriminating power at lower Bjorken-x among different Monte Carlo event generator predictions." }); // ]]> </script>  </div> </div> <div style="clear:both;margin-bottom: 0;"></div> </div> <div class="bottom-left"></div><div class="bottom-right"></div> </div> </div></div> <footer id="footer" class="pagefooter clearfix">  <div class="pagefooterstripeleft"> CERN Document Server :: <a class="footer" href="https://cds.cern.ch/?ln=ka">ძებნა</a> :: <a class="footer" href="https://cds.cern.ch/submit?ln=ka">დაყენება</a> :: <a class="footer" href="https://cds.cern.ch/youraccount/display?ln=ka">პერს</a> :: <a class="footer" href="https://cds.cern.ch/help/?ln=ka">დახმარება</a> :: <a class="footer" href="https://cern.service-now.com/service-portal?id=privacy_policy&se=CDS-Service" target="_blank">Privacy Notice</a> <br /> დაფუძნებულია <a class="footer" href="http://invenio-software.org/">Invenio</a> <br /> შენახულია <a class="footer" href="https://cern.service-now.com/service-portal?id=service_element&name=CDS-Service">CDS Service</a> - Need help? 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