A New Method for Indirect Mass Measurements using the Integral Charge Asymmetry at the LHC

TL;DR

This paper introduces a novel indirect method for measuring the mass of charged final states at the LHC using the integral charge asymmetry, demonstrated on W bosons and supersymmetric particles.

Contribution

It proposes a new approach based on charge asymmetry measurements, combining theoretical predictions and particle simulations for mass estimation.

Findings

Effective in extracting W boson mass

Applicable to supersymmetric chargino and neutralino mass sum

Provides a full uncertainty analysis

Abstract

Processes producing a charged final state at the LHC have a positive integral charge asymmetry. We propose a novel method for an indirect measurement of the mass of these final states based upon the process integral charge asymmetry. First, the theoretical prediction of the integral charge asymmetry and its related uncertainties are studied through parton level cross sections calculations. Then, the experimental extraction of the integral charge asymmetry of a given signal, in the presence of some background, is performed using particle level simulations. Process dependent templates enable to convert the measured integral charge asymmetry into an estimated mass of the charged final state. Finally, a combination of the experimental and the theoretical uncertainties determines the full uncertainty of the indirect mass measurement. This new method applies to all charged current processes at the LHC. In this article, we demonstrate its effectiveness at extracting the mass of the W boson, as a first step, and the sum of the masses of a chargino and a neutralino in case these supersymmetric particles are produced by pair, as a second step.