25–27 oct. 2023
Luminy
Fuseau horaire Europe/Paris

Taking aim at the wino-higgsino plane with the LHC

25 oct. 2023, 17:04
20m
Amphitheater Hexagone/CPPM (Luminy)

Amphitheater Hexagone/CPPM

Luminy

Orateur

Taylor Murphy (LPTHE (Sorbonne U./CNRS))

Description

In this work we explore multiple search strategies for higgsinos and mixed higgsino-wino states in the MSSM and project the results onto the $(\mu,M_2)$ plane. Assuming associated production of higgsino-like pairs with a $W/Z$ boson, we develop a search in a channel characterized by a hadronically tagged vector boson accompanied by missing energy. We use as our template an ATLAS search for dark matter produced in association with a hadronically decaying vector boson, but upgrade the search by implementing a joint likelihood analysis, binning the missing transverse energy distribution, which greatly improves the search sensitivity. For higgsino-like states (more than 96% admixture) we find sensitivity to masses up to 550 GeV. For well-mixed higgsino-wino states (70-30% higgsino) we still find sensitivities above 300 GeV. Using this newly proposed search, we draw a phenomenological map of the wino-higgsino parameter space, recasting several complementary searches for disappearing tracks, soft leptons, trileptons, and hadronic diboson events in order to predict LHC coverage of the $(\mu,M_2)$ mass plane at integrated luminosities of up to $3\,\text{ab}^{-1}$. Altogether, the full run of the HL-LHC can exclude much of the "natural" ($\mu,M_2 <$ 500 GeV) wino-higgsino parameter space.

Auteur principal

Taylor Murphy (LPTHE (Sorbonne U./CNRS))

Co-auteurs

Humberto Gilmer (Brown University) Junichiro Kawamura (Keio University) Linda Carpenter (The Ohio State University)

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