Mutually elusive: Vectorlike antileptons and leptoquarks

Bigaran, Innes; Dobrescu, Bogdan A.; Russo, Alessandro

doi:10.1103/PhysRevD.109.055033

Title: Mutually elusive: Vectorlike antileptons and leptoquarks

Journal Article · 18 March 2024 · Physical Review. D.

DOI: https://doi.org/10.1103/PhysRevD.109.055033 · OSTI ID:2325208

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We study the properties of vectorlike fermions that have the same gauge charges as the Standard Model lepton doublets, but opposite lepton number. These antileptons undergo decays mediated by heavier scalar leptoquarks, while the symmetries of this renormalizable model protect the vectorlike fermions and the leptoquarks from standard decays probed so far at colliders. We derive upper limits on the new Yukawa couplings imposed by flavor-changing processes, including $B \to K ν \bar{ν}$ and $B_{s} - {\bar{B}}_{s}$ mixing, and show that they are compatible with prompt antilepton decays at the LHC for wide parameter ranges. If the new particles couple predominantly to second-generation quarks, then their collider probes involve multiple jets and two taus or neutrinos, and are hampered by large backgrounds. If couplings to third-generation quarks are large, then the collider signals involve top quarks, and can be probed more efficiently at the LHC. Even in that case, both the vectorlike fermion doublet and the leptoquarks remain more elusive than in models with standard decays. Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 2325208

Alternate ID(s):: OSTI ID: 2333001

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 5 Vol. 109; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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