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The most recent searches for HNLs at the CMS experiment are presented. Searches using proton-proton collisions at $\sqrt{s}=13$ TeV recorded in the 2016-2018 data-taking period exploited various production and decay channels, focusing both on short- and long-lived HNLs for masses ranging from few GeV to the TeV scale. So far, observations are consistent with SM background predictions. The results are interpreted as upper limits on active-sterile mixing parameters, for various mixing scenarios, and under both Majorana and Dirac assumptions. 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min-height: 360px; } </style> <table class="formatRecordTableFullWidth"> <tr> <td class="formatRecordHeader" style="background-image: url('/img/journals.jpg');" colspan="2">  CMS Note </td> </tr> <tr><td class="formatRecordLabel"> Report number </td><td style="padding-left:5px;">CMS-CR-2024-297</td></tr> <tr><td class="formatRecordLabel"> Title </td><td style="padding-left:5px;"><b>HNLs at CMS</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;"><a href="https://cds.cern.ch/search?f=author&p=Lunerti%2C%20Leonardo&ln=ka">Lunerti, Leonardo</a> (INFN, Bologna)</td></tr> <tr><td class="formatRecordLabel"> Publication </td><td style="padding-left:5px;">2025</td></tr> <tr><td class="formatRecordLabel"> Collaboration </td><td style="padding-left:5px;">CMS Collaboration</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 = 'INTNOTECMSPUBL ; ConferencePaper ; 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;">30 Oct 2024</td></tr> <tr><td class="formatRecordLabel"> Number of pages </td><td style="padding-left:5px;">8</td></tr>  <tr><td class="formatRecordLabel"> Published in: </td><td style="padding-left:5px;"><a href="http://dx.doi.org/10.22323/1.478.0030"><i>PoS</i> LHCP2024 (2025) 030</a> </a></td></tr> <tr><td class="formatRecordLabel"> Presented at </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/record/2897247">12th Edition of the Large Hadron Collider Physics Conference (LHCP2024)</a>, Boston, United States, 3 - 7 Jun 2024, pp.030</td></tr> <tr><td class="formatRecordLabel"> DOI </td><td style="padding-left:5px;"><a href="http://dx.doi.org/10.22323/1.478.0030" title="DOI" target="_blank">10.22323/1.478.0030</a> <tr><td class="formatRecordLabel"> Subject category </td><td style="padding-left:5px;">Detectors and Experimental Techniques</td></tr> <tr><td class="formatRecordLabel"> Accelerator/Facility, Experiment </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/search?p=CERN%20LHC&f=693__a">CERN LHC</a> ; <a href="https://cds.cern.ch/search?p=CMS&f=693__e">CMS</a></td></tr> <tr><td class="formatRecordLabel"> Keywords </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/search?f=keyword&p=General&ln=ka">General</a></td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">The discovery of neutrino oscillations suggests non-zero masses for active neutrinos, which may result from the presence of massive sterile neutrinos, or heavy neutral leptons (HNLs). The most recent searches for HNLs at the CMS experiment are presented. Searches using proton-proton collisions at $\sqrt{s}=13$ TeV recorded in the 2016-2018 data-taking period exploited various production and decay channels, focusing both on short- and long-lived HNLs for masses ranging from few GeV to the TeV scale. So far, observations are consistent with SM background predictions. The results are interpreted as upper limits on active-sterile mixing parameters, for various mixing scenarios, and under both Majorana and Dirac assumptions.</td></tr> <tr><td class="formatRecordLabel"> Other source </td><td style="padding-left:5px;"><a href="http://inspirehep.net/record/2866399">Inspire</a></td></tr> </table> <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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