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Title
Japanese:Measurement of event-shape observables in $Z \rightarrow \ell {+} \ell {-}$ events in $pp$ collisions at $\sqrt{s}=$ 7 TeV with the ATLAS detector at the LHC 
English:Measurement of event-shape observables in $Z \rightarrow \ell {+} \ell {-}$ events in $pp$ collisions at $\sqrt{s}=$ 7 TeV with the ATLAS detector at the LHC 
Author
Japanese: 山口洋平.  
English: Youhei Yamaguchi.  
Language English 
Journal/Book name
Japanese: 
English: 
Volume, Number, Page Vol. "C76"    No. "7"    pp. "375"
Published date Feb. 2016 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
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English: 
Official URL http://inspirehep.net/record/1424838
 
DOI https://doi.org/10.1140/epjc/s10052-016-4176-8
Abstract Event-shape observables measured using charged particles in inclusive Z-boson events are presented, using the electron and muon decay modes of the Z bosons. The measurements are based on an integrated luminosity of $1.1~\mathrm{fb}^{-1}$ of proton–proton collisions recorded by the ATLAS detector at the LHC at a centre-of-mass energy $\sqrt{s}=7$   ${\mathrm{TeV}}$ . Charged-particle distributions, excluding the lepton–antilepton pair from the Z-boson decay, are measured in different ranges of transverse momentum of the Z boson. Distributions include multiplicity, scalar sum of transverse momenta, beam thrust, transverse thrust, spherocity, and ${\mathcal {F}}$ -parameter, which are in particular sensitive to properties of the underlying event at small values of the Z-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 Z-boson transverse momenta than at low Z-boson transverse momenta, and for the observables that are less sensitive to the number of charged particles in the

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