Antihyperhelium-4: First Evidence at the LHC

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The selection of (anti)hypernuclei exploits the displaced decay vertex topology of the particles originating from weak decays. Signals of antihyperhydrogen-4 (a bound of an antiproton, two antineutrons, and a ¯Λ) and antihyperhelium-4 (a bound of two antiprotons, an antineutron, and a ¯Λ) are selected with a machine learning technique, which provides a significant improvement in the discrimination between signal and background compared to standard selection techniques. Antihyperhydrogen-4 is reconstructed through its charged mesonic two-body decay into an (anti)4He and a charged pion, while antihyperhelium-4 is reconstructed via its charged mesonic three-body decay into an (anti)3He, an (anti)proton, and a charged pion. The illustration shows the constituents of antihyperhelium-4. 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The selection of (anti)hypernuclei exploits the displaced decay vertex topology of the particles originating from weak decays. Signals of antihyperhydrogen-4 (a bound of an antiproton, two antineutrons, and a ¯Λ) and antihyperhelium-4 (a bound of two antiprotons, an antineutron, and a ¯Λ) are selected with a machine learning technique, which provides a significant improvement in the discrimination between signal and background compared to standard selection techniques. Antihyperhydrogen-4 is reconstructed through its charged mesonic two-body decay into an (anti)4He and a charged pion, while antihyperhelium-4 is reconstructed via its charged mesonic three-body decay into an (anti)3He, an (anti)proton, and a charged pion. 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The selection of (anti)hypernuclei exploits the displaced decay vertex topology of the particles originating from weak decays. Signals of antihyperhydrogen-4 (a bound of an antiproton, two antineutrons, and a ¯Λ) and antihyperhelium-4 (a bound of two antiprotons, an antineutron, and a ¯Λ) are selected with a machine learning technique, which provides a significant improvement in the discrimination between signal and background compared to standard selection techniques. Antihyperhydrogen-4 is reconstructed through its charged mesonic two-body decay into an (anti)4He and a charged pion, while antihyperhelium-4 is reconstructed via its charged mesonic three-body decay into an (anti)3He, an (anti)proton, and a charged pion. The illustration shows the constituents of antihyperhelium-4.<p /> <p style="font-size:small"> <br /><em>Photograph</em>: Ditzel, Janik <br /><em>Keywords</em>: <a href="https://cds.cern.ch/search?f=keyword&p=ALICE&ln=no">ALICE</a>; <a href="https://cds.cern.ch/search?f=keyword&p=Event&ln=no">Event</a>; <a href="https://cds.cern.ch/search?f=keyword&p=ALICE%20General&ln=no">ALICE General</a> <br /> <br /><em>Note</em>: General Photo <br /> </p> </div> </td> </tr> <tr> <td> <center><small><strong><a href="https://copyright.web.cern.ch/">Conditions of Use</a> © 2024 CERN, for the benefit of the ALICE Collaboration</strong></small></center><center><small><a href="https://cds.cern.ch/help/high-res-multimedia?ln=no">Accessing copyrighted material</a></small></center><br /><div style="text-align:center">Total images: 1</div> <div style="text-align:center;margin:10px"> <div style="text-align:center;vertical-align:top;"> <a id="thumb1" href="https://cds.cern.ch/record/2917859/files/antihyperhelium-4_illustration.png?subformat=icon-1440" class="highslide" onclick="return hs.expand(this)"> <img src='/img/file-icon-image-96x128.png' data-src="https://cds.cern.ch/record/2917859/files/antihyperhelium-4_illustration.png?subformat=icon-640" style="max-height:490px; 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The selection of (anti)hypernuclei exploits the displaced decay vertex topology of the particles originating from weak decays. Signals of antihyperhydrogen-4 (a bound of an antiproton, two antineutrons, and a \u00af\u039b) and antihyperhelium-4 (a bound of two antiprotons, an antineutron, and a \u00af\u039b) are selected with a machine learning technique, which provides a significant improvement in the discrimination between signal and background compared to standard selection techniques. Antihyperhydrogen-4 is reconstructed through its charged mesonic two-body decay into an (anti)4He and a charged pion, while antihyperhelium-4 is reconstructed via its charged mesonic three-body decay into an (anti)3He, an (anti)proton, and a charged pion. The illustration shows the constituents of antihyperhelium-4." }); // ]]> </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=no">Søk</a> :: <a class="footer" href="https://cds.cern.ch/submit?ln=no">Send inn</a> :: <a class="footer" href="https://cds.cern.ch/youraccount/display?ln=no">Brukerinnstillinger</a> :: <a class="footer" href="https://cds.cern.ch/help/?ln=no">Hjelp</a> :: <a class="footer" href="https://cern.service-now.com/service-portal?id=privacy_policy&se=CDS-Service" target="_blank">Privacy Notice</a> <br /> Powered by <a class="footer" href="http://invenio-software.org/">Invenio</a> <br /> Vedlikeholdt av <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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Antihyperhelium-4: First Evidence at the LHC - CERN Document Server