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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">     <html xmlns="http://www.w3.org/1999/xhtml" lang="ka" xml:lang="ka" xmlns:og="http://ogp.me/ns#" xmlns:fb="http://ogp.me/ns/fb#"> <head> <title>Search for leptonic decays of dark photons at NA62 - CERN Document Server</title> <link href='https://framework.web.cern.ch/framework/2.0/fonts/PTSansWeb/PTSansWeb.css' rel='stylesheet' type='text/css' /> <link rel="stylesheet" href="https://cds.cern.ch/img/invenio.css?v=20141127" type="text/css" /> <link rel="stylesheet" href="https://cds.cern.ch/img/cern_theme/css/cern_theme.css?v=20141127" type="text/css" /> <link rel="stylesheet"href="/css/font-awesome.min.css"> <meta http-equiv="X-UA-Compatible" content="IE=Edge"/> <link rel="stylesheet" href="https://cds.cern.ch/img/cern_toolbar/css/toolbar.css" type="text/css" />    <link rel="canonical" href="https://cds.cern.ch/record/2875458" /> <link rel="alternate" hreflang="el" href="https://cds.cern.ch/record/2875458?ln=el" /> <link rel="alternate" hreflang="fr" href="https://cds.cern.ch/record/2875458?ln=fr" /> <link rel="alternate" hreflang="bg" href="https://cds.cern.ch/record/2875458?ln=bg" /> <link rel="alternate" hreflang="zh-TW" href="https://cds.cern.ch/record/2875458?ln=zh_TW" /> <link rel="alternate" hreflang="pt" href="https://cds.cern.ch/record/2875458?ln=pt" /> <link rel="alternate" hreflang="no" href="https://cds.cern.ch/record/2875458?ln=no" /> <link rel="alternate" hreflang="hr" href="https://cds.cern.ch/record/2875458?ln=hr" /> <link rel="alternate" hreflang="ca" href="https://cds.cern.ch/record/2875458?ln=ca" /> <link rel="alternate" hreflang="de" href="https://cds.cern.ch/record/2875458?ln=de" /> <link rel="alternate" hreflang="it" href="https://cds.cern.ch/record/2875458?ln=it" /> <link rel="alternate" hreflang="zh-CN" href="https://cds.cern.ch/record/2875458?ln=zh_CN" /> <link rel="alternate" hreflang="sv" href="https://cds.cern.ch/record/2875458?ln=sv" /> <link rel="alternate" hreflang="sk" href="https://cds.cern.ch/record/2875458?ln=sk" /> <link rel="alternate" hreflang="en" href="https://cds.cern.ch/record/2875458?ln=en" /> <link rel="alternate" hreflang="pl" href="https://cds.cern.ch/record/2875458?ln=pl" /> <link rel="alternate" hreflang="ru" href="https://cds.cern.ch/record/2875458?ln=ru" /> <link rel="alternate" hreflang="ka" href="https://cds.cern.ch/record/2875458?ln=ka" /> <link rel="alternate" hreflang="ja" href="https://cds.cern.ch/record/2875458?ln=ja" /> <link rel="alternate" hreflang="es" href="https://cds.cern.ch/record/2875458?ln=es" /> <link rel="alternate" type="application/rss+xml" title="CERN Document Server RSS" href="/rss?ln=ka" /> <link rel="search" type="application/opensearchdescription+xml" href="https://cds.cern.ch/opensearchdescription" title="CERN Document Server" /> <link rel="unapi-server" type="application/xml" title="unAPI" href="https://cds.cern.ch/unapi" /> <link rel="apple-touch-icon" href="/apple-touch-icon.png"/> <link rel="apple-touch-icon-precomposed" href="/apple-touch-icon-precomposed.png"/> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta http-equiv="Content-Language" content="ka" /> <meta name="description" content="The NA62 experiment at CERN, configured in beam-dump mode, has searched for dark photon decays in flight to electron-positron pairs using a sample of $1.4 \times 10^{17}$ protons on dump collected in 2021. No evidence for a dark photon signal is observed. The combined result for dark photon searches in lepton-antilepton final states is presented and a region of the parameter space is excluded at 90% CL, improving on previous experimental limits for dark photon mass values between 50 and 600 MeV/$c^2$ and coupling values in the range $10^{−6}$ to $4 \times 10^{−5}$. An interpretation of the $e^+ e^−$ search result in terms of the emission and decay of an axion-like particle is also presented. The NA62 experiment at CERN, configured in beam-dump mode, has searched for dark photon decays in flight to electron-positron pairs using a sample of <math display="inline"><mn>1.4</mn><mo>×</mo><msup><mn>10</mn><mn>17</mn></msup></math> protons on dump collected in 2021. No evidence for a dark photon signal is observed. The combined result for dark photon searches in lepton–antilepton final states is presented and a region of the parameter space is excluded at 90% confidence level, improving on previous experimental limits for dark photon mass values between 50 and <math display="inline"><mrow><mn>600</mn><mtext> </mtext><mtext> </mtext><mi>MeV</mi><mo>/</mo><msup><mrow><mi>c</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math> and coupling values in the range <math display="inline"><msup><mn>10</mn><mrow><mo>-</mo><mn>6</mn></mrow></msup></math> to <math display="inline"><mn>4</mn><mo>×</mo><msup><mn>10</mn><mrow><mo>-</mo><mn>5</mn></mrow></msup></math>. An interpretation of the <math display="inline"><msup><mi>e</mi><mo>+</mo></msup><msup><mi>e</mi><mo>-</mo></msup></math> search result in terms of the emission and decay of an axionlike particle is also presented. The NA62 experiment at CERN, configured in beam-dump mode, has searched for dark photon decays in flight to electron-positron pairs using a sample of $1.4\times 10^{17}$ protons on dump collected in 2021. No evidence for a dark photon signal is observed. The combined result for dark photon searches in lepton-antilepton final states is presented and a region of the parameter space is excluded at 90% CL, improving on previous experimental limits for dark photon mass values between 50 and 600 MeV$/c^2$ and coupling values in the range $10^{-6}$ to $4\times10^{-5}$. An interpretation of the $e^+ e^-$ search result in terms of the emission and decay of an axion-like particle is also presented. Cortina Gil, Eduardo; Jerhot, Jan; Kleimenova, Alina; Lurkin, Nicolas; Zamkovsky, Michal; Numao, Toshio; Velghe, Bob; Wong, Vincent Wai Sum; Bryman, Douglas; Hives, Zdenko; Husek, Tomas; Kampf, Karol; Koval, Michal; De Martino, Bianca; Perrin-Terrin, Mathieu; Potrebenikov, Yuri; Döbrich, Babette; Lezki, Samet; Akmete, Atakan Tugberk; Aliberti, Riccardo; Di Lella, Luigi; Doble, Niels; Peruzzo, Letizia; Schuchmann, Simone; Wahl, Heinrich; Wanke, Rainer; Dalpiaz, Pietro; Neri, Ilaria; Petrucci, Ferruccio; Soldani, Mattia; Bandiera, Laura; Cotta Ramusino, Angelo; Gianoli, Alberto; Romagnoni, Marco; Sytov, Alexei; Lenti, Massimo; Lo Chiatto, Prisco; Marchevski, Radoslav; Panichi, Ilaria; Ruggiero, Giuseppe; Bizzeti, Andrea; Bucci, Francesca; Antonelli, Antonella; Kozhuharov, Venelin; Lanfranchi, Gaia; Martellotti, Silvia; Moulson, Matthew; Spadaro, Tommaso; Tinti, Gemma; Ambrosino, Fabio; D'Errico, Mariaelena; Fiorenza, Renato; Giordano, Raffaele; Massarotti, Paolo; Mirra, Marco; Napolitano, Marco; Rosa, Ilaria; Saracino, Giulio; Anzivino, Giuseppina; Brizioli, Francesco; Cenci, Patrizia; Duk, Viacheslav; Lollini, Riccardo; Lubrano, Pasquale; Pepe, Monica; Piccini, Mauro; Costantini, Flavio; Giorgi, Marcello; Giudici, Sergio; Lamanna, Gianluca; Lari, Enrico; Pedreschi, Elena; Pinzino, Jacopo; Sozzi, Marco; Fantechi, Riccardo; Spinella, Franco; Mannelli, Italo; Raggi, Mauro; Biagioni, Andrea; Cretaro, Paolo; Frezza, Ottorino; Lonardo, Alessandro; Turisini, Matteo; Vicini, Piero; Ammendola, Roberto; Bonaiuto, Vincenzo; Fucci, Adolfo; Salamon, Andrea; Sargeni, Fausto; Arcidiacono, Roberta; Bloch-Devaux, Brigitte; Menichetti, Ezio; Migliore, Ernesto; Biino, Cristina; Filippi, Alessandra; Marchetto, Flavio; Soldi, Dario; Briano Olvera, Alejandro; Engelfried, Jürgen; Estrada-Tristan, Nora; Piandani, Roberto; Reyes Santos, Marco Antonio; Rodriguez Rivera, Kevin Alexander; Boboc, Petre; Bragadireanu, Alexandru Mario; Ghinescu, Stefan Alexandru; Hutanu, Ovidiu Emanuel; Blazek, Tomas; Cerny, Vladimir; Kucerova, Zuzana; Volpe, Roberta; Bernhard, Johannes; Bician, Lubos; Boretto, Marco; Ceccucci, Augusto; Ceoletta, Marco; Corvino, Michele; Danielsson, Hans; Duval, Francois; Federici, Luca; Gamberini, Enrico; Guida, Roberto; Holzer, Eva Barbara; Jenninger, Berthold; Lehmann Miotto, Giovanna; Lichard, Peter; Massri, Karim; Minucci, Elisa; Noy, Matthew; Ryjov, Vladimir; Swallow, Joel; Fry, John Richard; Gonnella, Francesco; Goudzovski, Evgueni; Henshaw, Jack; Kenworthy, Chandler; Lazzeroni, Cristina; Parkinson, Christopher; Romano, Angela; Sanders, Jack; Sergi, Antonino; Shaikhiev, Artur; Tomczak, Adam; Heath, Helen; Britton, David; Norton, Alan; Protopopescu, Dan; Dainton, John Bourke; Gatignon, Lau; Jones, Roger William Lewis; Cooper, Peter; Coward, David; Rubin, Philip David; Baeva, Aigul; Baigarashev, Dosbol; Emelyanov, Dmitry; Enik, Temur; Falaleev, Valeri; Fedotov, Sergei; Gorshanov, Konstantin; Gushchin, Evgeny; Kekelidze, Vladimir; Kereibay, Dias; 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content="https://cds.cern.ch/record/2875458/files/w2_cda_vs_z_primary_vertices_data_blinded_inFV.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2875458/files/w2_cda_vs_z_primary_vertices_data_blinded_inFV.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2875458/files/w1_cda_vs_zvtx_data_allPartID_blinded_no_upstream_log.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2875458/files/w1_cda_vs_zvtx_data_allPartID_blinded_no_upstream_log.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2875458/files/ALPee_mi_90CL_fin_newcharm.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2875458/files/ALPee_mi_90CL_fin_newcharm.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2875458/files/w3_exclusion_ll_0.9CL.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2875458/files/w3_exclusion_ll_0.9CL.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2875458/files/w0_na62_2021-DUMP-YZ_Floor_WithB3_noGround.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2875458/files/w0_na62_2021-DUMP-YZ_Floor_WithB3_noGround.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2875458/files/w4_ALPee_mi_90CL_fin_newcharm.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2875458/files/w4_ALPee_mi_90CL_fin_newcharm.png" /> <meta content="CERN Document Server" property="og:site_name" /> <meta content="The NA62 experiment at CERN, configured in beam-dump mode, has searched for dark photon decays in flight to electron-positron pairs using a sample of $1.4 \times 10^{17}$ protons on dump collected in 2021. No evidence for a dark photon signal is observed. The combined result for dark photon searches in lepton-antilepton final states is presented and a region of the parameter space is excluded at 90% CL, improving on previous experimental limits for dark photon mass values between 50 and 600 MeV/$c^2$ and coupling values in the range $10^{−6}$ to $4 \times 10^{−5}$. An interpretation of the $e^+ e^−$ search result in terms of the emission and decay of an axion-like particle is also presented." property="og:description" /> <meta content="APS" property="og:description" /> <meta content="The NA62 experiment at CERN, configured in beam-dump mode, has searched for dark photon decays in flight to electron-positron pairs using a sample of 1.4×1017 protons on dump collected in 2021. No evidence for a dark photon signal is observed. The combined result for dark photon searches in lepton–antilepton final states is presented and a region of the parameter space is excluded at 90% confidence level, improving on previous experimental limits for dark photon mass values between 50 and 600 MeV/c2 and coupling values in the range 10-6 to 4×10-5. An interpretation of the e+e- search result in terms of the emission and decay of an axionlike particle is also presented." property="og:description" /> <meta content="arXiv" property="og:description" /> <meta content="The NA62 experiment at CERN, configured in beam-dump mode, has searched for dark photon decays in flight to electron-positron pairs using a sample of $1.4\times 10^{17}$ protons on dump collected in 2021. No evidence for a dark photon signal is observed. The combined result for dark photon searches in lepton-antilepton final states is presented and a region of the parameter space is excluded at 90% CL, improving on previous experimental limits for dark photon mass values between 50 and 600 MeV$/c^2$ and coupling values in the range $10^{-6}$ to $4\times10^{-5}$. An interpretation of the $e^+ e^-$ search result in terms of the emission and decay of an axion-like particle is also presented." property="og:description" />  <meta content="summary" name="twitter:card" /> <meta content="summary" name="twitter:card" /> <style></style> </head> <body class="NA6232Papers 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/2875458%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> > <a href="/collection/CERN%20Experiments?ln=ka" class="navtrail">CERN Experiments</a> > <a href="/collection/Fixed%20Target%20Experiments?ln=ka" class="navtrail">Fixed Target Experiments</a> > <a href="/collection/NA62?ln=ka" class="navtrail">NA62</a> > <a href="/collection/NA62%20Papers?ln=ka" class="navtrail">NA62 Papers</a> > Search for leptonic decays of dark photons at NA62 </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/2875458/?ln=ka">ინფორმაცია </a></li><li class=""><a href="/record/2875458/comments?ln=ka">განხილვა (17) </a></li><li class=""><a href="/record/2875458/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="2875458"></abbr>  <link href="/img/download_and_embed_buttons.css" rel="stylesheet" type="text/css" /> <style type="text/css">  .video_talk_wrapper{ max-width: 640px; min-height: 360px; } </style> <table class="formatRecordTableFullWidth"> <tr> <td class="formatRecordHeader" style="background-image: url('/img/journals.jpg');" colspan="2">  Article </td> </tr> <tr><td class="formatRecordLabel"> Report number </td><td style="padding-left:5px;"><a href="http://arxiv.org/abs/arXiv:2312.12055">arXiv:2312.12055</a> ; CERN-EP-2023-296</td></tr> <tr><td class="formatRecordLabel"> Title </td><td style="padding-left:5px;"><b>Search for leptonic decays of dark photons at NA62 Search for Leptonic Decays of Dark Photons at NA62</b></td></tr> <style> .video_control_container, #video_controlbutton { display: none; }#video_detailbox_download {display: none;}#video_detailbox_embed {display: none;}</style> <div class="video_control_container"> <div style="box-sizing: inherit;position: relative;min-height: 1em;margin: 1em 0;background: #f8f8f9;padding: 1em 1.5em;line-height: 1.4285em;transition: opacity .1s ease,color .1s ease,background .1s ease,box-shadow .1s ease,-webkit-box-shadow .1s ease;border-radius: .28571429rem;font-size: 1.1em;margin-top: 0;margin-bottom: 6px;background-color: #f8ffff;color: #276f86;box-shadow: 0 0 0 1px #a9d5de inset,0 0 0 0 transparent;"> <i class="fa fa-info"></i><span style="padding-left: 9px;">If you experience any problem watching the video, click the download button below</span> </div> <a id="video_controlbutton_download" rel="download_button" class="video_controlbutton" href="#">Download</a> <a id="video_controlbutton_embed" class="video_controlbutton" href="#">Embed</a> </div> <div id="video_detailbox_download" style="margin:10px"> </div> <div id="video_detailbox_embed" style="margin:10px"> </div> <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 182 ავტორის ჩვენება " } link.style.color = "rgb(204,0,0);" } function set_up(){ var extension = document.getElementById('extension'); extension.innerHTML = "NA62 Collaboration "; toggle_authors_visibility(); } </script> <a name="show_hide" /><p id="more" style=""><a href="https://cds.cern.ch/search?f=author&p=Cortina%20Gil%2C%20Eduardo&ln=ka">Cortina Gil, Eduardo</a> (Louvain U., CP3) ; <a href="https://cds.cern.ch/search?f=author&p=Jerhot%2C%20Jan&ln=ka">Jerhot, Jan</a> (Louvain U., CP3 ; Munich, Max Planck Inst.) ; <a href="https://cds.cern.ch/search?f=author&p=Kleimenova%2C%20Alina&ln=ka">Kleimenova, Alina</a> (Louvain U., CP3 ; EPFL) ; <a href="https://cds.cern.ch/search?f=author&p=Lurkin%2C%20Nicolas&ln=ka">Lurkin, Nicolas</a> (Louvain U., CP3) ; 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Phys.) ; <a href="https://cds.cern.ch/search?f=author&p=Aliberti%2C%20Riccardo&ln=ka">Aliberti, Riccardo</a> (Mainz U., Inst. Phys. ; Helmholtz Inst., Mainz) ; <a href="https://cds.cern.ch/search?f=author&p=Di%20Lella%2C%20Luigi&ln=ka">Di Lella, Luigi</a> (Mainz U., Inst. Phys.) ; <a href="https://cds.cern.ch/search?f=author&p=Doble%2C%20Niels&ln=ka">Doble, Niels</a> (Mainz U., Inst. Phys.) ; <a href="https://cds.cern.ch/search?f=author&p=Peruzzo%2C%20Letizia&ln=ka">Peruzzo, Letizia</a> (Mainz U., Inst. Phys.) ; <a href="https://cds.cern.ch/search?f=author&p=Schuchmann%2C%20Simone&ln=ka">Schuchmann, Simone</a> (Mainz U., Inst. Phys.) ; <a href="https://cds.cern.ch/search?f=author&p=Wahl%2C%20Heinrich&ln=ka">Wahl, Heinrich</a> (Mainz U., Inst. Phys.) ; <a href="https://cds.cern.ch/search?f=author&p=Wanke%2C%20Rainer&ln=ka">Wanke, Rainer</a> (Mainz U., Inst. Phys.) ; <a href="https://cds.cern.ch/search?f=author&p=Dalpiaz%2C%20Pietro&ln=ka">Dalpiaz, Pietro</a> (Ferrara U.) ; <a href="https://cds.cern.ch/search?f=author&p=Neri%2C%20Ilaria&ln=ka">Neri, Ilaria</a> (Ferrara U.) ; <a href="https://cds.cern.ch/search?f=author&p=Petrucci%2C%20Ferruccio&ln=ka">Petrucci, Ferruccio</a> (Ferrara U.) ; <a href="https://cds.cern.ch/search?f=author&p=Soldani%2C%20Mattia&ln=ka">Soldani, Mattia</a> (Ferrara U.) ; <a href="https://cds.cern.ch/search?f=author&p=Bandiera%2C%20Laura&ln=ka">Bandiera, Laura</a> (INFN, Ferrara) ; <a href="https://cds.cern.ch/search?f=author&p=Cotta%20Ramusino%2C%20Angelo&ln=ka">Cotta Ramusino, Angelo</a> (INFN, Ferrara) ; <a href="https://cds.cern.ch/search?f=author&p=Gianoli%2C%20Alberto&ln=ka">Gianoli, Alberto</a> (INFN, Ferrara) ; <a href="https://cds.cern.ch/search?f=author&p=Romagnoni%2C%20Marco&ln=ka">Romagnoni, Marco</a> (INFN, Ferrara) ; <a href="https://cds.cern.ch/search?f=author&p=Sytov%2C%20Alexei&ln=ka">Sytov, Alexei</a> (INFN, Ferrara) ; 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Sofiya U.) ; <a href="https://cds.cern.ch/search?f=author&p=Lanfranchi%2C%20Gaia&ln=ka">Lanfranchi, Gaia</a> (Frascati) ; <a href="https://cds.cern.ch/search?f=author&p=Martellotti%2C%20Silvia&ln=ka">Martellotti, Silvia</a> (Frascati) ; <a href="https://cds.cern.ch/search?f=author&p=Moulson%2C%20Matthew&ln=ka">Moulson, Matthew</a> (Frascati) ; <a href="https://cds.cern.ch/search?f=author&p=Spadaro%2C%20Tommaso&ln=ka">Spadaro, Tommaso</a> (Frascati) ; <a href="https://cds.cern.ch/search?f=author&p=Tinti%2C%20Gemma&ln=ka">Tinti, Gemma</a> (Frascati) ; <a href="https://cds.cern.ch/search?f=author&p=Ambrosino%2C%20Fabio&ln=ka">Ambrosino, Fabio</a> (Naples U.) ; <a href="https://cds.cern.ch/search?f=author&p=D%27Errico%2C%20Mariaelena&ln=ka">D'Errico, Mariaelena</a> (Naples U.) ; <a href="https://cds.cern.ch/search?f=author&p=Fiorenza%2C%20Renato&ln=ka">Fiorenza, Renato</a> (Naples U. ; SSM, Naples) ; <a href="https://cds.cern.ch/search?f=author&p=Giordano%2C%20Raffaele&ln=ka">Giordano, Raffaele</a> (Naples U.) ; <a href="https://cds.cern.ch/search?f=author&p=Massarotti%2C%20Paolo&ln=ka">Massarotti, Paolo</a> (Naples U.) ; <a href="https://cds.cern.ch/search?f=author&p=Mirra%2C%20Marco&ln=ka">Mirra, Marco</a> (Naples U.) ; <a href="https://cds.cern.ch/search?f=author&p=Napolitano%2C%20Marco&ln=ka">Napolitano, Marco</a> (Naples U.) ; <a href="https://cds.cern.ch/search?f=author&p=Rosa%2C%20Ilaria&ln=ka">Rosa, Ilaria</a> (Naples U.) ; <a href="https://cds.cern.ch/search?f=author&p=Saracino%2C%20Giulio&ln=ka">Saracino, Giulio</a> (Naples U.) ; <a href="https://cds.cern.ch/search?f=author&p=Anzivino%2C%20Giuseppina&ln=ka">Anzivino, Giuseppina</a> (Perugia U.) ; <a href="https://cds.cern.ch/search?f=author&p=Brizioli%2C%20Francesco&ln=ka">Brizioli, Francesco</a> (INFN, Perugia ; CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Cenci%2C%20Patrizia&ln=ka">Cenci, Patrizia</a> (INFN, Perugia) ; <a href="https://cds.cern.ch/search?f=author&p=Duk%2C%20Viacheslav&ln=ka">Duk, Viacheslav</a> (INFN, Perugia) ; 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<a href="https://cds.cern.ch/search?f=author&p=Protopopescu%2C%20Dan&ln=ka">Protopopescu, Dan</a> (Glasgow U.) ; <a href="https://cds.cern.ch/search?f=author&p=Dainton%2C%20John%20Bourke&ln=ka">Dainton, John Bourke</a> (Lancaster U.) ; <a href="https://cds.cern.ch/search?f=author&p=Gatignon%2C%20Lau&ln=ka">Gatignon, Lau</a> (Lancaster U.) ; <a href="https://cds.cern.ch/search?f=author&p=Jones%2C%20Roger%20William%20Lewis&ln=ka">Jones, Roger William Lewis</a> (Lancaster U.) ; <a href="https://cds.cern.ch/search?f=author&p=Cooper%2C%20Peter&ln=ka">Cooper, Peter</a> (George Mason U.) ; <a href="https://cds.cern.ch/search?f=author&p=Coward%2C%20David&ln=ka">Coward, David</a> (George Mason U. ; SLAC) ; <a href="https://cds.cern.ch/search?f=author&p=Rubin%2C%20Philip%20David&ln=ka">Rubin, Philip David</a> (George Mason U.) ; <a href="https://cds.cern.ch/search?f=author&p=Baeva%2C%20Aigul&ln=ka">Baeva, Aigul</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Baigarashev%2C%20Dosbol&ln=ka">Baigarashev, Dosbol</a> (Eurasian Nat. U., Astana) ; <a href="https://cds.cern.ch/search?f=author&p=Emelyanov%2C%20Dmitry&ln=ka">Emelyanov, Dmitry</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Enik%2C%20Temur&ln=ka">Enik, Temur</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Falaleev%2C%20Valeri&ln=ka">Falaleev, Valeri</a> (INFN, Perugia) ; <a href="https://cds.cern.ch/search?f=author&p=Fedotov%2C%20Sergei&ln=ka">Fedotov, Sergei</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Gorshanov%2C%20Konstantin&ln=ka">Gorshanov, Konstantin</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Gushchin%2C%20Evgeny&ln=ka">Gushchin, Evgeny</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Kekelidze%2C%20Vladimir&ln=ka">Kekelidze, Vladimir</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Kereibay%2C%20Dias&ln=ka">Kereibay, Dias</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Kholodenko%2C%20Sergey&ln=ka">Kholodenko, Sergey</a> (INFN, Pisa) ; <a href="https://cds.cern.ch/search?f=author&p=Khotyantsev%2C%20Alexey&ln=ka">Khotyantsev, Alexey</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Korotkova%2C%20Anna&ln=ka">Korotkova, Anna</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Kudenko%2C%20Yury&ln=ka">Kudenko, Yury</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Kurochka%2C%20Viktoriia&ln=ka">Kurochka, Viktoriia</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Kurshetsov%2C%20Viktor&ln=ka">Kurshetsov, Viktor</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Litov%2C%20Leandar&ln=ka">Litov, Leandar</a> (Sofiya U.) ; <a href="https://cds.cern.ch/search?f=author&p=Madigozhin%2C%20Dmitry&ln=ka">Madigozhin, Dmitry</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Mefodev%2C%20Aleksandr&ln=ka">Mefodev, Aleksandr</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Misheva%2C%20Milena&ln=ka">Misheva, Milena</a> (Sofiya, Inst. Nucl. Res.) ; <a href="https://cds.cern.ch/search?f=author&p=Molokanova%2C%20Natalia&ln=ka">Molokanova, Natalia</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Obraztsov%2C%20Vladimir&ln=ka">Obraztsov, Vladimir</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Okhotnikov%2C%20Artem&ln=ka">Okhotnikov, Artem</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Polenkevich%2C%20Irina&ln=ka">Polenkevich, Irina</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Potrebenikov%2C%20Yu.&ln=ka">Potrebenikov, Yu.</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Sadovskiy%2C%20Alexander&ln=ka">Sadovskiy, Alexander</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Shkarovskiy%2C%20Sergey&ln=ka">Shkarovskiy, Sergey</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Sugonyaev%2C%20Valentin&ln=ka">Sugonyaev, Valentin</a> (Higher Sch. of Economics, Moscow) ; <a href="https://cds.cern.ch/search?f=author&p=Yushchenko%2C%20Oleg&ln=ka">Yushchenko, Oleg</a> (Higher Sch. of Economics, Moscow)</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"> Corporate <span style="white-space:nowrap;">author(s)</span> </td><td style="padding-left:5px;">The NA62 collaboration</td></tr> <tr><td class="formatRecordLabel"> Publication </td><td style="padding-left:5px;">2024-09-11</td></tr>  <script type="text/javascript"> /* * Changes the Imprint title to Date - Duration as requested by RQF0820114 * This is a hack not to touch the general imprint format element */ $(document).ready(function() { var collections = 'NA62_Papers ; ARTICLE'; if (collections.indexOf('E-LEARNING') > -1) { $('.cern-imprint-label').text('Date - Duration'); } }) </script> <tr><td class="formatRecordLabel cern-imprint-label"> Imprint </td><td style="padding-left:5px;">17 Sep 2024</td></tr> <tr><td class="formatRecordLabel"> Number of pages </td><td style="padding-left:5px;">10</td></tr>  <tr><td class="formatRecordLabel"> Published in: </td><td style="padding-left:5px;"><a href="http://dx.doi.org/10.1103/PhysRevLett.133.111802"><i>Phys. Rev. Lett.</i> 133 (2024) 111802</a> </a></td></tr> <tr><td class="formatRecordLabel"> DOI </td><td style="padding-left:5px;"><a href="http://dx.doi.org/10.1103/PhysRevLett.133.111802" title="DOI" target="_blank">10.1103/PhysRevLett.133.111802</a> <tr><td class="formatRecordLabel"> Subject category </td><td style="padding-left:5px;">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=CERN%20SPS&f=693__a">CERN SPS</a> ; <a href="https://cds.cern.ch/search?p=NA62&f=693__e">NA62</a></td></tr> <tr><td class="formatRecordLabel"> Keywords </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/search?f=keyword&p=exotics&ln=ka">exotics</a> ; <a href="https://cds.cern.ch/search?f=keyword&p=experimental%20results&ln=ka">experimental results</a> ; <a href="https://cds.cern.ch/search?f=keyword&p=Beam-dump%20experiment&ln=ka">Beam-dump experiment</a> ; <a href="https://cds.cern.ch/search?f=keyword&p=Dark%20photon%20production%20and%20decay%20to%20dileptons&ln=ka">Dark photon production and decay to dileptons</a> ; <a href="https://cds.cern.ch/search?f=keyword&p=Axion-like%20particle%20search&ln=ka">Axion-like particle search</a></td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">The NA62 experiment at CERN, configured in beam-dump mode, has searched for dark photon decays in flight to electron-positron pairs using a sample of $1.4 \times 10^{17}$ protons on dump collected in 2021. No evidence for a dark photon signal is observed. The combined result for dark photon searches in lepton-antilepton final states is presented and a region of the parameter space is excluded at 90% CL, improving on previous experimental limits for dark photon mass values between 50 and 600 MeV/$c^2$ and coupling values in the range $10^{−6}$ to $4 \times 10^{−5}$. An interpretation of the $e^+ e^−$ search result in terms of the emission and decay of an axion-like particle is also presented.</td></tr> <tr><td class="formatRecordLabel"> Other source </td><td style="padding-left:5px;"><a href="http://inspirehep.net/record/2738578">Inspire</a></td></tr> <tr><td class="formatRecordLabel"> Copyright/License </td><td style="padding-left:5px;">Publication: © 2024-2025 authors (License: <a href="https://creativecommons.org/licenses/by/4.0/">CC BY 4.0</a>), sponsored by <a href="http://scoap3.org">SCOAP³</a><br/>Preprint: © 2023-2025 CERN (License: <a href="https://creativecommons.org/licenses/by/4.0/">CC-BY-4.0</a>)</td></tr> <tr><td class="formatRecordLabel"> Submitted by </td><td style="padding-left:5px;"><a href="mailto:brigitte.bloch-devaux@cern.ch">brigitte.bloch-devaux@cern.ch</a></td></tr> </table> <br /><div style="max-width:1024px;margin:auto"><div style="overflow-x:auto;display:inline;width:100%;"><a href="/record/2875458/plots#0"><img style="vertical-align:middle;" src="https://cds.cern.ch/record/2875458/files/na62_2021-DUMP-YZ_Floor_WithB3_noGround.png" title=" Schematic side view of the NA62 setup in 2021. Information from KTAG, GTK, CHANTI, MUV1,2, IRC, and SAC is not used in this analysis. Not all beam elements are shown." width="200px"/></a> <a href="/record/2875458/plots#0"><img style="vertical-align:middle;" src="https://cds.cern.ch/record/2875458/files/w0_na62_2021-DUMP-YZ_Floor_WithB3_noGround.png" title=" Schematic side view of the NA62 setup in 2021. Information from KTAG, GTK, CHANTI, MUV1,2, IRC, and SAC is not used in this analysis. Not all beam elements are shown." width="200px"/></a> <a href="/record/2875458/plots#1"><img style="vertical-align:middle;" src="https://cds.cern.ch/record/2875458/files/cda_vs_zvtx_data_allPartID_blinded_no_upstream_log.png" title=" Distribution of two-track vertex positions in the plane ($Z_{\mathrm{vtx}}$, $\rho_{\mathrm{vtx}}$) for data events, without particle identification requirements. The black contour defines the restricted FV." width="200px"/></a> <a href='/record/2875458/plots'>Show more plots</a></div></div><br /> <br/><div><div style="clear: both;"> </div></div> <script type="text/javascript"> // Initially hide: $(".longCaption").hide(); // Allow to toggle visibility: $(".toggleLongCaption").toggle(function(){ $(this).siblings(".longCaption").show('fast'); var thisElem = $(this); thisElem.text(thisElem.text() === "მეტი" ? "ნაკლები" : "მეტი"); },function(){ $(this).siblings(".longCaption").hide('fast'); var thisElem = $(this); thisElem.text(thisElem.text() === "მეტი" ? 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