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

CollaborationWith : Ancu, Lucian Stefan / Bell, William / Bilbao De Mendizabal, Javier / Calace, Noemi / Chatterjee, Avishek / Clark, Allan Geoffrey / Coccaro, Andrea / Delitzsch, Chris Malena / Della Volpe, Domenico / Ferrere, Didier / Gadomski, Szymon / Golling, Tobias / Gonzalez Sevilla, Sergio / Gramling, Johanna Léna / Guescini, Francesco / Iacobucci, Giuseppe / Katre, Akshay / March Ruiz, Luis / Mermod, Philippe / Miucci, Antonio / Nackenhorst, Olaf / Paolozzi, Lorenzo / Ristic, Branislav / Schramm, Steven / Sfyrla, Anna / Vallecorsa, Sofia / Wu, Xin
Published in European Physical Journal. C. 2016, vol. 76, no. 7, p. 375
Collection Open Access - SCOAP3
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.
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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, 2016, vol. 76, n° 7, p. 375. https://archive-ouverte.unige.ch/unige:85592

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Deposited on : 2016-08-02

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