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Measurement of charged-particle event shape variables in inclusive root(s)=7 TeV proton-proton interactions with the ATLAS detector

Authors
  • G Aad
  • T Abajyan
  • B Abbott
  • J Abdallah
  • SA Khalek
  • AA Abdelalim
  • O Abdinov
  • R Aben
  • B Abi
  • M Abolins
  • OS AbouZeid
  • H Abramowicz
  • H Abreu
  • E Acerbi
  • BS Acharya
  • L Adamczyk
  • DL Adams
  • TN Addy
  • J Adelman
  • S Adomeit
  • And 2871 more
Journal
Physical Review D
Publisher
American Physical Society
Publication Date
Aug 06, 2013
Volume
88
Issue
3
Identifiers
DOI: 10.1103/physrevd.88.032004

Abstract

The measurement of charged-particle event shape variables is presented in inclusive inelastic pp collisions at a center-of-mass energy of 7 TeV using the ATLAS detector at the LHC. The observables studied are the transverse thrust, thrust minor, and transverse sphericity, each defined using the final-state charged particles' momentum components perpendicular to the beam direction. Events with at least six charged particles are selected by a minimum-bias trigger. In addition to the differential distributions, the evolution of each event shape variable as a function of the leading charged-particle transverse momentum, charged-particle multiplicity, and summed transverse momentum is presented. Predictions from several Monte Carlo models