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Search for new physics in the $\tau$ lepton plus missing transverse momentum final state in proton-proton collisions at $\sqrt{s}$ = 13 TeV

CMS Collaboration
Dec 2022
A search for physics beyond the standard model (SM) in the final state with ahadronically decaying tau lepton and a neutrino is presented. This analysis isbased on data recorded by the CMS experiment from proton-proton collisions at acenter-of-mass energy of 13 TeV at the LHC, corresponding to a total integratedluminosity of 138 fb$^{=1}$. The transverse mass spectrum is analyzed for thepresence of new physics. No significant deviation from the SM prediction isobserved. Limits are set on the production cross section of a W' boson decayinginto a tau lepton and a neutrino. Lower limits are set on the mass of thesequential SM-like heavy charged vector boson and the mass of a quantum blackhole. Upper limits are placed on the couplings of a new boson to the SMfermions. Constraints are put on a nonuniversal gauge interaction model and aneffective field theory model. For the first time, upper limits on the crosssection of $t$-channel leptoquark (LQ) exchange are presented. These limits aretranslated into exclusion limits on the LQ mass and on its coupling in the$t$-channel. The sensitivity of this analysis extends into the parameter spaceof LQ models that attempt to explain the anomalies observed in B meson decays.The limits presented for the various interpretations are the most stringent todate. Additionally, a model-independent limit is provided.