Probing new physics with charge asymmetries in 2 same-sign leptons plus jets final states at the LHC

ARGANDA, ERNESTO; DA ROLD, LEANDRO; JUSTE, AURELIO; MEDINA, ANIBAL D.; SANDÁ SEOANE, ROSA M.

JOURNAL OF HIGH ENERGY PHYSICS - (Online)

Springer

Año: 2024 vol. 2024

1029-8479

We study the impact of new physics models in the charge asymmetry defined for LHC finalstates consisting of two same-sign leptons (2SSl, with l = e, µ) plus jets (Njets ≥ 2), with acenter-of-mass energy of √s = 13 TeV, where the main SM contribution is ttW¯ production.Concretely, we consider three different new physics sources for the charge asymmetries: a heavyneutral scalar/pseudoscalar arising from the general two Higgs doublet model, an effective theory with dimension-6 four-quark operators, and a simplified R-parity-violating supersymmetric model with electroweakino production (higgsino-like or wino-like). We propose measuringthe charge asymmetries differentially with respect to several kinematic observables, and inclusively/exclusively with the number of b-tagged jets in the final state (Nb ≥ {1, 2, 3}). Resultsare compared with the SM prediction using the χ-squared criteria, expressing sensitivity in terms of the normal Gaussian significance. We show that some of the proposed new physics scenarios canbe probed at the LHC even for the already recorded integrated luminosity of 139 fb−1. Finally,we also estimate the prospects for the potential LHC sensitivity to the considered new physicsmodels in its high-luminosity phase.