Measurement of event-shape observables in <i>Z</i> → <i>l</i><SUP>+</SUP><i>l</i><SUP>-</SUP> events in <i>pp</i> collisions at √<i>s</i>=7 TeV with the ATLAS detector at the LHC



Aad, G, Abbott, B, Abdallah, J, Abdinov, O, Abeloos, B, Aben, R, Abolins, M, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2859 more authors) (2016) Measurement of event-shape observables in <i>Z</i> → <i>l</i><SUP>+</SUP><i>l</i><SUP>-</SUP> events in <i>pp</i> collisions at √<i>s</i>=7 TeV with the ATLAS detector at the LHC. EUROPEAN PHYSICAL JOURNAL C, 76 (7). 375-.

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Abstract

Event-shape observables measured using charged particles in inclusive <i>Z</i>-boson events are presented, using the electron and muon decay modes of the <i>Z</i> bosons. The measurements are based on an integrated luminosity of [Formula: see text] of proton-proton collisions recorded by the ATLAS detector at the LHC at a centre-of-mass energy [Formula: see text] [Formula: see text]. Charged-particle distributions, excluding the lepton-antilepton pair from the <i>Z</i>-boson decay, are measured in different ranges of transverse momentum of the <i>Z</i> boson. Distributions include multiplicity, scalar sum of transverse momenta, beam thrust, transverse thrust, spherocity, and [Formula: see text]-parameter, which are in particular sensitive to properties of the underlying event at small values of the <i>Z</i>-boson transverse momentum. The measured observables are compared with predictions from Pythia 8, Sherpa, and Herwig 7. Typically, all three Monte Carlo generators provide predictions that are in better agreement with the data at high <i>Z</i>-boson transverse momenta than at low <i>Z</i>-boson transverse momenta, and for the observables that are less sensitive to the number of charged particles in the event.

Item Type: Article
Additional Information: 36 pages plus author list + cover page (54 pages total), 14 figures, 4 tables, submitted to EPJC, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2014-07
Uncontrolled Keywords: Atlas Collaboration, Atlas Collaboration, Atlas Collaboration
Depositing User: Symplectic Admin
Date Deposited: 03 Jan 2017 15:34
Last Modified: 18 Oct 2023 02:28
DOI: 10.1140/epjc/s10052-016-4176-8
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3005061