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A new method for indirect mass measurements using the integral charge asymmetry at the LHC

Authors
  • Muanza, G. Steve1
  • Serre, Thomas1
  • 1 CPPM UMR 7346, CNRS/IN2P3, Aix Marseille Université, 163 Avenue de Luminy, Marseille, 13288, France , Marseille (France)
Type
Published Article
Journal
Journal of High Energy Physics
Publisher
Springer-Verlag
Publication Date
Apr 29, 2016
Volume
2016
Issue
4
Identifiers
DOI: 10.1007/JHEP04(2016)179
Source
Springer Nature
Keywords
License
Green

Abstract

Processes producing a charged final state at the LHC most often have a positive or null 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. We present this method in three stages. Firstly, the theoretical prediction of the integral charge asymmetry and its related uncertainties are studied through parton level cross sections calculations. Secondly, 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. Thirdly, 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.

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