Abstract
Results are reported from a search for physics beyond the standard model in proton–proton collisions at a center-of-mass energy of s=13TeV. The search uses a signature of a single lepton, large jet and bottom quark jet multiplicities, and high sum of large-radius jet masses, without any requirement on the missing transverse momentum in an event. The data sample corresponds to an integrated luminosity of 35.9 fb−1 recorded by the CMS experiment at the LHC. No significant excess beyond the prediction from standard model processes is observed. The results are interpreted in terms of upper limits on the production cross section for R-parity violating supersymmetric extensions of the standard model using a benchmark model of gluino pair production, in which each gluino decays promptly via g˜→tbs. Gluinos with a mass below 1610 GeV are excluded at 95% confidence level.
Highlights
Searches for physics beyond the standard model (SM) are motivated by several considerations, including theoretical problems associated with explaining the observed mass of the Higgs boson in the presence of quantum corrections [1], and astrophysical evidence for dark matter [2]
Trigger efficiencies are over 99% for signal events passing the analysis selection defined below. These events are further selected with a baseline requirement of exactly one electron or muon, MJ > 500 GeV, HT > 1200 GeV, that the number of small-R jets (Njet) be at least 4, and that the number of those jets that are tagged as bottom quark jets (Nb ) be at least 1
To search for signal events arising from new high-mass particles decaying with large jet and b-jet multiplicities, the Nb distribution is examined in different kinematic regions based on Njet and MJ
Summary
Searches for physics beyond the standard model (SM) are motivated by several considerations, including theoretical problems associated with explaining the observed mass of the Higgs boson in the presence of quantum corrections (the hierarchy problem) [1], and astrophysical evidence for dark matter [2]. This benchmark is used for interpreting results, the search is structured to be generically sensitive to high-mass signatures with large jet and bottom quark jet multiplicities and either little or no pmT iss, which are potential features of other models of physics beyond the SM. Previous limits on such MFV m√odels were obtained by the ATLAS and CMS Collabo√rations at s = 8 TeV [31,32,33] and by the ATLAS Collaboration at s = 13 TeV [34], excluding gluino masses below ∼1 TeV and 1.6 TeV, respectively. These events are further selected with a baseline requirement of exactly one electron or muon, MJ > 500 GeV, HT > 1200 GeV, that the number of small-R jets (Njet) be at least 4, and that the number of those jets that are tagged as bottom quark jets (Nb ) be at least 1
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