Lepton-quark fusion at Hadron colliders, precisely

Journal of High Energy Physics

Admir Greljo¹  Nudžeim Selimović² 

[1] Albert Einstein Center for Fundamental Physics, Institut für Theoretische Physik, Universität Bern, Sidlerstrasse 5, CH-3012, Bern, Switzerland;CERN, Theoretical Physics Department, CH-1211, Geneva 23, Switzerland;Physik-Institut, Universität Zürich, CH-8057, Zürich, Switzerland;

关键词: Beyond Standard Model;    Perturbative QCD;    Heavy Quark Physics;   

DOI  :  10.1007/JHEP03(2021)279

来源: Springer

【 摘 要 】

When a TeV-scale leptoquark has a sizeable Yukawa coupling, its dominant production mechanism at hadron colliders is the partonic-level lepton-quark fusion. Even though the parton distribution functions for leptons inside the proton are minuscule, they get compensated by the resonant enhancement. We present the first computation of higher order radiative corrections to the resonant leptoquark production cross section at the Large Hadron Collider (LHC). Next-to-leading (NLO) QCD and QED corrections are similar in size but come with the opposite sign. We compute NLO K-factors for a wide range of scalar leptoquark masses, as well as, all possible combinations of quark and lepton flavors and leptoquark charges. Theoretical uncertainties due to the renormalisation and factorisation scale variations and the limited knowledge of parton distribution functions are quantified. We finally discuss how to disentangle the flavor structure of leptoquark interactions by exploiting the interplay between different production channels.

【 授权许可】

CC BY