Searches for physics beyond the standard model with the MT2variable in hadronic final states with and without disappearingtracks in proton–proton collisions at √s = 13 TeV
2020
Two related searches for phenomena beyond the
standard model (BSM) are performed using events with
hadronic jets and significant transverse momentum imbalance. The results are based on a sample of proton–proton
collisions at a center-of-mass energy of 13 TeV, collected by
the CMS experiment at the LHC in 2016–2018 and corresponding to an integrated luminosity of 137 fb−1. The first
search is inclusive, based on signal regions defined by the
hadronic energy in the event, the jet multiplicity, the number of jets identified as originating from bottom quarks, and
the value of the kinematic variable MT2 for events with at
least two jets. For events with exactly one jet, the transverse
momentum of the jet is used instead. The second search looks
in addition for disappearing tracks produced by BSM longlived charged particles that decay within the volume of the
tracking detector. No excess event yield is observed above the
predicted standard model background. This is used to constrain a range of BSM models that predict the following: the
pair production of gluinos and squarks in the context of supersymmetry models conserving R-parity, with or without intermediate long-lived charginos produced in the decay chain;
the resonant production of a colored scalar state decaying to
a massive Dirac fermion and a quark; or the pair production
of scalar and vector leptoquarks each decaying to a neutrino
and a top, bottom, or light-flavor quark. In most of the cases,
the results obtained are the most stringent constraints to date.
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