Abstract

A search for gauge-mediated supersymmetry (SUSY) in final states with photons and large missing transverse momentum is presented. The data sample of pp collisions at s=13TeV was collected with the CMS detector at the CERN LHC and corresponds to an integrated luminosity of 35.9 fb−1. Data are compared with models in which the lightest neutralino has bino- or wino-like components, resulting in decays to photons and gravitinos, where the gravitinos escape detection. The event selection is optimized for both electroweak (EWK) and strong production SUSY scenarios. The observed data are consistent with standard model predictions, and limits are set in the context of a general gauge mediation model in which gaugino masses up to 980 GeV are excluded at 95% confidence level. Gaugino masses below 780 and 950 GeV are excluded in two simplified models with EWK production of mass-degenerate charginos and neutralinos. Stringent limits are set on simplified models based on gluino and squark pair production, excluding gluino (squark) masses up to 2100 (1750) GeV depending on the assumptions made for the decay modes and intermediate particle masses. This analysis sets the highest mass limits to date in the studied EWK models, and in the considered strong production models when the mass difference between the gauginos and the squarks or gluinos is small.

Highlights

  • The search for physics beyond the standard model (SM) is one of the key research topics of the CMS experiment at the CERN LHC

  • A search for electroweak (EWK) and strong production of gauginos in the framework of gauge mediated supersymmetry breaking in final states with photons and large missing transverse momentum has been performed

  • The data were found to agree with the expectation from the standard model, without any indication of new physics

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Summary

Introduction

The search for physics beyond the standard model (SM) is one of the key research topics of the CMS experiment at the CERN LHC. Since current searches are pushing the limits on strongly produced SUSY particles (sparticles) beyond the one-TeV threshold, the interest in probing gaugino masses via EWK production is growing. Compared to analyses requiring photons and large hadronic activity, this analysis has superior sensitivity to GMSB SUSY in EWK production, and in strong production if the squark, gluino, and the lightest gaugino masses are similar (compressed-spectrum scenarios). An earlier version of this analysis [26] was carried out by CMS on a special 8 TeV data set recorded as part of the “parked-data” program [27] corresponding to an integrated luminosity of 7.4 fb−1 using a dedicated trigger and a lower photon transverse momentum (pT) threshold of 30 GeV. Single-photon and HT-based analyses [31], where HT is the scalar sum of hadronic jet transverse momenta, have good sensitivity for strong production in GMSB models but lack sensitivity for EWK production and compressed-spectrum scenarios

Signal models
The CMS detector
Object reconstruction and simulation
Event selection
Background estimation
Results and interpretation
Summary
Carrera Jarrin
Khvedelidze 8
Krofcheck
Grynyov
Full Text
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