Charge asymmetry ratio as a probe of quark flavour couplings of resonant particles at the LHC

TL;DR

This paper proposes using charge asymmetry ratios at the LHC to probe quark flavor couplings of new heavy resonances, demonstrating the method with a left-right symmetric W' model and showing its potential to constrain quark-W' mixing scenarios.

Contribution

It introduces a novel approach to constrain quark flavor couplings of new particles using charge asymmetry ratios, with detailed simulations for a W' model at the LHC.

Findings

Charge asymmetry can constrain quark-W' mixing scenarios.

Method effective at 14 TeV LHC energies.

Simulations show potential to distinguish different mixing scenarios.

Abstract

We show how a precise knowledge of parton distribution functions, in particular those of the u and d quarks, can be used to constrain a certain class of New Physics models in which new heavy charged resonances couple to quarks and leptons. We illustrate the method by considering a left-right symmetric model with a W' from a SU(2)_R gauge sector produced in quark-antiquark annihilation and decaying into a charged lepton and a heavy Majorana neutrino. We discuss a number of quark and lepton mixing scenarios, and simulate both signals and backgrounds in order to determine the size of the expected charge asymmetry. We show that various quark-W' mixing scenarios can indeed be constrained by charge asymmetry measurements at the LHC, particularly at 14 TeV centre of mass energy.