Drell-Yan production in third-generation gauge vector leptoquark models at NLO+PS in QCD

Abstract

Motivated by the long-standing hints of lepton-flavour non-universality in the $b\to c\ell \nu$ and $b\to s{\ell }^{+}{\ell }^{-}$ channels, we study Drell-Yan ditau production at the Large Hadron Collider (LHC). In the context of models with third-generation gauge vector leptoquarks (LQs), we calculate the complete $\mathcal{O}({\alpha }_s)$ corrections to the $pp\to {\tau }^{+}{\tau }^{-}$ process, achieving next-to-leading order (NLO) plus parton shower (NLO$+$PS) accuracy using the POWHEG method. We provide a dedicated Monte Carlo code that evaluates the NLO QCD corrections on-the-fly in the event generation and use it to study the numerical impact of NLO$+$PS corrections on the kinematic distributions that enter the existing experimental searches for non-resonant ditau final states. Based on our phenomenological analysis we derive NLO accurate constraints on the masses and couplings of third-generation gauge vector LQs using the latest LHC ditau search results corresponding to an integrated luminosity of around $140{\mathrm{fb}}^{-1}$ of proton-proton collisions at $\sqrt{s}=13\mathrm{TeV}$. The presented NLO$+$PS generator allows for an improved signal modelling, making it an essential tool for future ATLAS and CMS searches for vector LQs in ${\tau }^{+}{\tau }^{-}$ final states at LHC Run III and beyond.

26 pages, 9 figures, v2: extended version of the manuscript as published in JHEP. arXiv admin note: text overlap with arXiv:2207.00356

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