The search for a third-generation leptoquark coupling to a τ\tau lepton and a b quark through single, pair and nonresonant production at s=13 TeV\sqrt{s}=13~\mathrm{TeV}

Collaboration
2022
27 pages
  • Published: 2022
Report number:
  • CMS-PAS-EXO-19-016
Experiments:

Citations per year

2022202320241232
Abstract: (CDS)
A search is presented for a third-generation leptoquark (LQ) coupling to a τ\tau lepton and a b quark. Events with τ\tau leptons plus at least one jet originating from a b quark are considered, targeting the single and pair production of the LQ as well as nonresonant production via tt-channel LQ exchange. The search is based on proton-proton collision data at a center-of-mass energy of s=13 TeV\sqrt{s}=13~\mathrm{TeV} recorded with the CMS detector, corresponding to an integrated luminosity of 137 fb1137~\mathrm{fb}^{-1}. Upper limits are set on the LQ production cross section in the LQ mass range 0.5-2.3 TeV. Lower limits at 95%95\% confidence level on the LQ mass are set in the 1.22-1.96 TeV range and for a coupling strength less than 2.5, depending on the LQ model. Upper limits are also set on the coupling strength of such LQs as a function of their mass. For a representative LQ mass of 2 TeV and a coupling strength of 2.5, an excess with a significance of 3.4 standard deviations above the standard model expectation is observed in the data. Consequently, the observed upper limits on the LQ production cross section are about three times larger than expected for this benchmark. This document has been revised with respect to the version dated Jul 9, 2022.\textit{This document has been revised with respect to the version dated Jul 9, 2022.}
Note:
  • Preliminary results
  • Monte-Carlo
  • p p: colliding beams
  • leptoquark: production
  • family: 3
  • p p: scattering
  • leptoquark: coupling
  • tau: particle identification
  • bottom: particle identification
  • lepton
  • leptoquark: pair production