Addendum to “Combined constraints on first generation leptoquarks”

Abstract

In this addendum to the paper by Crivellin and Schnell [Phys. Rev. D 103, 115023 (2021)], we discuss the implications of the recent CMS analysis of lepton flavor universality violation in nonresonant di-lepton pairs for first generation leptoquarks. As CMS finds more electron events than expected from background, this analysis prefers the leptoquark representations ${\stackrel{\texttildelow{}}{S}}_{1},{S}_{2},{S}_{3},{\stackrel{\texttildelow{}}{V}}_{1},{V}_{2}({\ensuremath{\kappa}}_{2}^{\mathrm{RL}}\ensuremath{\ne}0)$ and ${V}_{3}$ which lead to constructive interference with the standard model (SM). In principle the excess could also be (partially) explained by the representations ${\stackrel{\texttildelow{}}{S}}_{2},{V}_{1}({\ensuremath{\kappa}}_{1}^{R}\ensuremath{\ne}0),{V}_{2}({\ensuremath{\kappa}}_{2}^{\mathrm{LR}}\ensuremath{\ne}0),{\stackrel{\texttildelow{}}{V}}_{2}$ which are interfering destructively, as this would still lead to the right effect in bins with high invariant mass where the new physics contribution dominates. However, in these cases large couplings would be required which are excluded by other observables. The representations ${S}_{1},{V}_{1}({\ensuremath{\kappa}}_{1}^{L}\ensuremath{\ne}0)$ cannot improve the fit to the CMS data compared to the SM.