Searches for additional Higgs bosons and for vector leptoquarks in ?? final states in proton-proton collisions at s = 13 TeV

Abstract

Three searches are presented for signatures of physics beyond the standard model (SM) in ?? final states in proton-proton collisions at the LHC, using a data sample collected with the CMS detector at s = 13 TeV, corresponding to an integrated luminosity of 138 fb?1. Upper limits at 95% confidence level (CL) are set on the products of the branching fraction for the decay into ? leptons and the cross sections for the production of a new boson ?, in addition to the H(125) boson, via gluon fusion (gg?) or in association with b quarks, ranging from O(10 pb) for a mass of 60 GeV to 0.3 fb for a mass of 3.5 TeV each. The data reveal two excesses for gg? production with local p-values equivalent to about three standard deviations at m? = 0.1 and 1.2 TeV. In a search for t-channel exchange of a vector leptoquark U1, 95% CL upper limits are set on the dimensionless U1 leptoquark coupling to quarks and ? leptons ranging from 1 for a mass of 1 TeV to 6 for a mass of 5 TeV, depending on the scenario. In the interpretations of the Mh125 and Mh,EFT125 minimal supersymmetric SM benchmark scenarios, additional Higgs bosons with masses below 350 GeV are excluded at 95% CL. � The Author(s) 2023.