Resonant leptoquark at NLO with POWHEG

Buonocore, Luca; Greljo, Admir; Krack, Peter; Nason, Paolo; Selimović, Nudžeim; Tramontano, Francesco; Zanderighi, Giulia (2022). Resonant leptoquark at NLO with POWHEG. Journal of High Energy Physics, 2022(11) Springer 10.1007/JHEP11(2022)129

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Recent progress in calculating lepton density functions inside the proton and simulating lepton showers laid the foundations for precision studies of resonant leptoquark production at hadron colliders. Direct quark-lepton fusion into a leptoquark is a novel production channel at the LHC that has the potential to probe a unique parameter space for large masses and couplings. In this work, we build the first Monte Carlo event generator for a full-fledged simulation of this process at NLO for production, followed by a subsequent decay using the POWHEG method and matching to the parton showers utilizing HERWIG. The code can handle all scalar leptoquark models with renormalisable quark-lepton interactions. We then comprehensively study the differential distributions, including higher-order effects, and assess the corresponding theoretical uncertainties. We also quantify the impact of the improved predictions on the projected (HL-)LHC sensitivities and initiate the first exploration of the potential at the FCC-hh. Our work paves the way toward performing LHC searches using this channel.

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