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T: Fachverband Teilchenphysik
T 9: Search for Supersymmetry
T 9.2: Talk
Monday, March 21, 2022, 16:30–16:45, T-H22
Search for Higgsinos in final states with a low-momentum, displaced track at the CMS experiment — Samuel Bein, Yuval Nissan, Peter Schleper, Alexandra Tews, and •Moritz Wolf — Universität Hamburg
Many supersymmetric extensions to the Standard Model predict the three lightest electroweakinos, χ20, χ1±, χ10, to be Higgsino-like with similar masses around the electroweak scale. The lightest chargino and the second-lightest neutralino can be pair-produced and decay to the lightest neutralino. To search for these particles, the best strategy depends on the differences between their masses. For Δ m ( χ20 , χ10) > O ( 1 GeV ) lepton pairs from the decay of the second-lightest neutralino leave an experimentally distinct signature, whereas Δ m ( χ1± , χ10 ) 0.3 GeV can lead to the chargino giving rise to a disappearing track. However, mass splittings in the range of Δ m ( χ1± , χ10 ) = 0.3 − 1.0 GeV are still unexplored at the LHC.
In this analysis, a slightly displaced track with low momentum, corresponding to a pion originating from the chargino decay, is used to gain sensitivity to this intermediate range of mass splittings.