<?xml version="1.0" encoding="UTF-8"?> <references> <reference> <a1>Ditzel, Janik</a1> <t1>Antihyperhelium-4: First Evidence at the LHC</t1> <t2/> <sn/> <op/> <vo/> <ab>TPb-Pb collision data taken by ALICE during 2018 at a centre-of-mass energy per nucleon pair of 5.02 TeV. 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 炉螞) and antihyperhelium-4 (a bound of two antiprotons, an antineutron, and a 炉螞) 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.</ab> <la/> <k1>ALICE; Event; ALICE General; </k1> <pb/> <pp/> <yr>2024</yr> <ed/> <ul>http://cds.cern.ch/record/2917859/files/antihyperhelium-4_illustration.png; http://cds.cern.ch/record/2917859/files/antihyperhelium-4_illustration.png?subformat=icon-640; http://cds.cern.ch/record/2917859/files/antihyperhelium-4_illustration.png?subformat=icon-1440; http://cds.cern.ch/record/2917859/files/antihyperhelium-4_illustration.png?subformat=icon-180; </ul> <no>Imported from Invenio.</no> </reference> </references>