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T: Fachverband Teilchenphysik

T 71: Supersymmetry: Theory and searches

T 71.9: Vortrag

Donnerstag, 2. April 2020, 18:30–18:45, H-HS VI

Soft and displaced tracks in searches for compressed Higgsinos at the CMS experiment — Samuel Bein, Viktor Kutzner, 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^± and 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 leads to the chargino in some cases giving rise to a disappearing track or a soft displaced pion. However, mass splittings in the range of Δ m(χ₁^±, χ₁⁰) = 0.3 − 1   GeV are still unexplored by either of those methods.

This study describes how a mono-jet analysis can be made more sensitive to Higgsinos with mass splittings in this range by requiring a soft and displaced track in the event corresponding to the pion originating from the chargino decay.