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T: Fachverband Teilchenphysik
T 81: Search for new particles 5 (SUSY)
T 81.6: Vortrag
Donnerstag, 7. März 2024, 17:15–17:30, Geb. 20.30: 1.067
Search for compressed electroweakinos in events with a low-momentum, displaced track at the CMS experiment — Samuel Bein, Peter Schleper, Alexandra Tews, and •Moritz Wolf — Universität Hamburg
Many supersymmetric extensions to the Standard Model predict the three lightest electroweakinos, χ20, χ1±, and χ10, to be Higgsino-like with nearly degenerate masses around the electroweak scale. The lightest chargino and the second-lightest neutralino can be produced alongside another electroweakino and then decay to the lightest neutralino. To search for these particles, the best strategy depends on the differences between the various 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, for mass splittings in the range of Δ m ( χ1± , χ10 ) = 0.3 − 1.0 GeV, searches carried out so far at the LHC are lacking in sensitivity.
In this analysis, a slightly displaced track with small transverse momentum, corresponding to a pion originating from the chargino decay, is used to gain sensitivity to this challenging range of mass splittings.
Keywords: searches; supersymmetry; Higgsino; compressed; long-lived