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

Author:

Haisch Ulrich,Schnell LucORCID,Schulte Stefan

Abstract

Abstract Motivated by the long-standing hints of lepton-flavour non-universality in the bcℓν and bsℓ+ 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 $$ \mathcal{O} $$ O (αs) corrections to the ppτ+τ 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 fb1 of proton-proton collisions at $$ \sqrt{s} $$ s = 13 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 τ+τ final states at LHC Run III and beyond.

Publisher

Springer Science and Business Media LLC

Subject

Nuclear and High Energy Physics

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