Searching for heavy leptoquarks at a muon collider

• Published in: The journal of high energy physics 2021-12, Vol.2021 (12), p.1-15, Article 47
• Main Authors: Qian, Sitian, Li, Congqiao, Li, Qiang, Meng, Fanqiang, Xiao, Jie, Yang, Tianyi, Lu, Meng, You, Zhengyun
• Format: Article
• Language: English
• Subjects: Beyond Standard Model; Classical and Quantum Gravitation; Elementary Particles; Flavor (particle physics); Heavy Quark Physics; High energy physics; Large Hadron Collider; Leptons; Luminosity; Magnetic moments; Muons; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Quarks; Regular Article - Theoretical Physics; Relativity Theory; Standard deviation; Standard model (particle physics); String Theory
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP12(2021)047

A bstract The LHCb Collaboration recently gave an update on testing lepton flavour universality with B + → K + ℓ + ℓ − , in which a 3.1 standard deviations from the standard model prediction was observed. The g-2 experiment also reports a 3.3 standard deviations from the standard model on muon anomalous magnetic moment measurement. These deviations could be explained by introducing new particles including leptoquarks. In this paper, we show the possibility to search for heavy spin-1 leptoquarks at a future TeV scale muon collider by performing studies from three channels: 1) same flavour final states with either two bottom or two light quarks, 2) different flavour quark final states, and 3) a so-called “VXS” process representing the scattering between a vector boson and a leptoquark to probe the coupling between leptoquark and tau lepton. We conclude that a 3 TeV muon collider with 3 ab − 1 of integrated luminosity is already sufficient to cover the leptoquark parameter space in order to explain the LHCb lepton flavour universality anomaly.