Search for new physics in multijet events with at least one photon and large missing transverse momentum in proton-proton collisions at 13 TeV

TL;DR

This study searches for signs of new physics in proton-proton collisions at 13 TeV, focusing on events with photons, multiple jets, and missing transverse momentum, but finds results consistent with the standard model.

Contribution

It introduces a comprehensive analysis of multijet events with photons and missing energy, setting new exclusion limits on supersymmetric particle masses using CMS data.

Findings

No significant deviation from the standard model observed.

Gluinos up to 2.35 TeV and squarks up to 1.43 TeV are excluded.

Electroweakinos up to 1.23 TeV are excluded.

Abstract

A search for new physics in final states consisting of at least one photon, multiple jets, and large missing transverse momentum is presented, using proton-proton collision events at a center-of-mass energy of 13 TeV. The data correspond to an integrated luminosity of 137 fb$^{-1}$, recorded by the CMS experiment at the CERN LHC from 2016 to 2018. The events are divided into mutually exclusive bins characterized by the missing transverse momentum, the number of jets, the number of b-tagged jets, and jets consistent with the presence of hadronically decaying W, Z, or Higgs bosons. The observed data are found to be consistent with the prediction from standard model processes. The results are interpreted in the context of simplified models of pair production of supersymmetric particles via strong and electroweak interactions. Depending on the details of the signal models, gluinos and squarks of masses up to 2.35 and 1.43 TeV, respectively, and electroweakinos of masses up to 1.23 TeV are excluded at 95% confidence level.