Abstract
A search for new physics is performed based on all-hadronic events with large missing transverse momentum produced in proton-proton collisions at sqrt(s) = 13 TeV. The data sample, corresponding to an integrated luminosity of 2.3 inverse femtobarns, was collected with the CMS detector at the CERN LHC in 2015. The data are examined in search regions of jet multiplicity, tagged bottom quark jet multiplicity, missing transverse momentum, and the scalar sum of jet transverse momenta. The observed numbers of events in all search regions are found to be consistent with the expectations from standard model processes. Exclusion limits are presented for simplified supersymmetric models of gluino pair production. Depending on the assumed gluino decay mechanism, and for a massless, weakly interacting, lightest neutralino, lower limits on the gluino mass from 1440 to 1600 GeV are obtained, significantly extending previous limits.
Highlights
The standard model (SM) of particle physics successfully describes a wide range of phenomena
Supersymmetry (SUSY) [1,2,3,4,5,6,7,8], one such extension, postulates that each SM particle is paired with a SUSY partner from which it differs in spin by one-half unit
The quantum chromodynamics (QCD) background in each search region is given by the product of the observed event yield in the corresponding region of the low- φ control regions (CRs) multiplied by a factor RQCD expressing the ratio of the expected QCD multijet background in the respective signal and low- φ regions, taking into account the contributions from non-QCD SM processes
Summary
The standard model (SM) of particle physics successfully describes a wide range of phenomena. The principal sources of background arise from the SM production of top quarks, a W or Z boson in association with jets (W + jets or Z + jets events), and multiple jets through the strong interaction.
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