Papers › Drell-Yan production in third-generation gauge vector leptoquark models at NLO+PS in QCD
Drell-Yan production in third-generation gauge vector leptoquark models at NLO+PS in QCD
Ulrich Haisch, Luc Schnell, Stefan Schulte
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Motivated by the long-standing hints of lepton-flavour non-universality in the b →c ℓν and b →s ℓ^+ ℓ^- 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 O (αₛ) corrections to the pp →τ^+ 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 fb⁻¹ of proton-proton collisions at √(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 $\tau^+ \tau^-$ final states at LHC Run III and beyond.
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