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Scientific article
Open access
English

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

ContributorsATLAS Collaboration
Published inEuropean physical journal. C, Particles and fields, vol. 76, no. 7, 375
Collection
  • Open Access - SCOAP3
Publication date2016
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 1.1fb-1 of proton–proton collisions recorded by the ATLAS detector at the LHC at a centre-of-mass energy s=7 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 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 P ythia 8, S herpa , and H erwig 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 event.

Citation (ISO format)
ATLAS Collaboration. Measurement of event-shape observables in Z→ℓ+ℓ- events in pp collisions at √s = 7 TeV with the ATLAS detector at the LHC. In: European physical journal. C, Particles and fields, 2016, vol. 76, n° 7, p. 375. doi: 10.1140/epjc/s10052-016-4176-8
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Article (Published version)
Identifiers
ISSN of the journal1434-6044
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