1 Ocak 2022 Dergi makalesi Açık Erişim

CERN İşbirliği

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    <subfield code="a">&lt;p&gt;A search for long-lived charginos produced either directly or in the cascade decay of heavy prompt gluino states is presented. The search is based on proton–proton collision data collected at a centre-of-mass energy of     $\sqrt{s}$   = 13 T    $\text{eV}$   between 2015 and 2018 with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 136 fb    ${}^{-1}$  . Long-lived charginos are characterised by a distinct signature of a short and then disappearing track, and are reconstructed using at least four measurements in the ATLAS pixel detector, with no subsequent measurements in the silicon-microstrip tracking volume nor any associated energy deposits in the calorimeter. The final state is complemented by a large missing transverse-momentum requirement for triggering purposes and at least one high-transverse-momentum jet. No excess above the expected backgrounds is observed. Exclusion limits are set at 95% confidence level on the masses of the chargino and gluino for different chargino lifetimes. Chargino masses up to 660 (210) G    $\text{eV}$   are excluded in scenarios where the chargino is a pure wino (higgsino). For charginos produced during the cascade decay of a heavy gluino, gluinos with masses below 2.1 T    $\text{eV}$   are excluded for a chargino mass of 300 G    $\text{eV}$   and a lifetime of 0.2 ns.&lt;/p&gt;</subfield>
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    <subfield code="a">Search for long-lived charginos based on a disappearing-track signature using 136 fb    ${}^{-1}$   of pp collisions at     $\sqrt{s}$   = 13 TeV with the ATLAS detector</subfield>
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