Resonant third-generation leptoquark signatures at the Large Hadron Collider

• Published in: The journal of high energy physics 2021-05, Vol.2021 (5), p.1-26, Article 57
• Main Authors: Haisch, Ulrich, Polesello, Giacomo
• Format: Article
• Language: English
• Subjects: Anomalies; Beyond Standard Model; Classical and Quantum Gravitation; Couplings; Elementary Particles; Flavor (particle physics); Hadron-Hadron scattering (experiments); High energy physics; Large Hadron Collider; Leptons; Luminosity; Particle decay; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Quarks; Regular Article - Experimental Physics; Relativity Theory; Searching; Signatures; Solenoids; String Theory
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP05(2021)057

A bstract Given the hints of lepton-flavour non-universality in B -meson decays, leptoquarks (LQs) are enjoying a renaissance. We propose novel Large Hadron Collider (LHC) searches for such hypothetical states that do not rely on strong production only, but can also receive important contributions from quark-lepton annihilation. For the cases of a resonant signal involving a bottom quark and a tau lepton ( b + τ ), a top quark and missing transverse energy ( E T miss ) and light-flavour jets plus E T miss , we develop realistic analysis strategies and provide detailed evaluations of the achievable sensitivities for the corresponding LQ signatures at future LHC runs. Our analyses allow us to derive a series of stringent constraints on the masses and couplings of third-generation singlet vector LQs, showing that at LHC Run III and the high-luminosity LHC the proposed search channels can probe interesting parts of the LQ parameter space addressing the B -physics anomalies. In view of the reach of the proposed b + τ signature, we recommend that dedicated resonance searches for this final state should be added to the exotics search canon of both ATLAS and CMS.