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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

Aad, G. and Abbott, B. and Abdallah, J. and Abdinov, O. and Abeloos, B. and Krasznahorkay, Attila and Pásztor, Gabriella and Tóth, József (2016) Measurement of event-shape observables in Z->l+l- events in pp collisions at √s=7 TeV with the ATLAS detector at the LHC. EUROPEAN PHYSICAL JOURNAL C, 76 (7). ISSN 1434-6044

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Abstract

Event-shape observables measured using charged particles in inclusive Z-boson events arepresented, using the electron and muon decay modes of the Z bosons. The measurementsare based on an integrated luminosity of 1.1 fb−1 of proton–proton collisions recorded bythe ATLAS detector at the LHC at a centre-of-mass energy √s=7 TeV. Charged-particledistributions, excluding the lepton–antilepton pair from the Z-boson decay, are measuredin different ranges of transverse momentum of the Z boson. Distributions include multi-plicity, scalar sum of transverse momenta, beam thrust, transverse thrust, spherocity, andF -parameter, which are in particular sensitive to properties of the underlying event at smallvalues of the Z-boson transverse momentum. The measured observables are compared withpredictions from Pythia 8, Sherpa, and Herwig 7. Typically, all three Monte Carlo generat-ors provide predictions that are in better agreement with the data at high Z-boson transversemomenta than at low Z-boson transverse momenta, and for the observables that are lesssensitive to the number of charged particles in the event.

Item Type: Article
Subjects: Q Science / természettudomány > QC Physics / fizika
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 22 Aug 2023 13:29
Last Modified: 22 Aug 2023 13:29
URI: http://real.mtak.hu/id/eprint/171906

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