CMS-PAS-EXO-21-009

CMS-PAS-EXO-21-009
Search for new physics in the $\tau$ plus missing transverse momentum final state in proton-proton collisions at $\sqrt{s}= $ 13 TeV
CMS Collaboration
July 2022

Abstract: A search for physics beyond the standard model (SM) in the final state with a hadronically decaying $\tau$ lepton and neutrino is presented. This analysis is based on data recorded by the CMS experiment from proton-proton collisions at a center-of-mass energy of 13 TeV at the LHC, corresponding to a total integrated luminosity of 138 fb$^{-1}$. No significant deviation from the SM prediction is observed. Model independent limits are set on the production cross section of W' bosons decaying into $\tau$ lepton plus neutrino final states. Lower limits are set on the mass of the sequential SM-like heavy charged vector boson and the mass of a quantum black hole. Upper limits are placed on the couplings of the new resonance with the SM fermions. Limits are additionally set on non-universal gauge interaction models and an effective field theory model. Upper limits on the cross section of $t$-channel leptoquark exchange are presented and are translated into exclusion limits on the mass and coupling of leptoquarks; the sensitivity of this analysis reaches into the parameter space of leptoquark models that could explain the anomalies measured in B-meson decays. The limits presented are the most stringent to date.
Links: CDS record (PDF) ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to JHEP. The superseded preliminary plots can be found here.

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