Searches for additional Higgs bosons and for vector leptoquarks in $\tau \tau$ final states in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Abstract

Three searches are presented for signatures of physics beyond the standard model (SM) in $\tau \tau$ final states in proton-proton collisions at the LHC, using a data sample collected with the CMS detector at $\sqrt{s}$ = 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 $\tau$ leptons and the cross sections for the production of a new boson $\varphi$, in addition to the H(125) boson, via gluon fusion (gg$\varphi$) or in association with b quarks, ranging from $\mathcal{O}$(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$\varphi$ production with local $p$-values equivalent to about three standard deviations at $m_{\varphi }$ = 0.1 and 1.2 TeV. In a search for $t$-channel exchange of a vector leptoquark U${}_1$, 95% CL upper limits are set on the dimensionless U${}_1$ leptoquark coupling to quarks and $\tau$ 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 $M_{\mathrm{h}}^{125}$ and $M_{\mathrm{h},\mathrm{EFT}}^{125}$ minimal supersymmetric SM benchmark scenarios, additional Higgs bosons with masses below 350 GeV are excluded at 95% CL.

arXiv commentReplaced with the published version. Added the journal reference and the DOI. All the figures and tables, including additional supplementary figures, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIG-21-001 (CMS Public Pages)

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