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

Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (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 - particles and fields, 76(7) EDP Sciences 10.1140/epjc/s10052-016-4176-8

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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 fb⁻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 Sherpa event generator shows larger deviations from the measured observables than Pythia8 and Herwig7. 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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Haug, Sigve; Weber, Michael and Beck, Hans Peter

Subjects:

500 Science > 530 Physics
500 Science > 510 Mathematics

ISSN:

1434-6044

Publisher:

EDP Sciences

Language:

English

Submitter:

Annette Krebs-Wegenast

Date Deposited:

08 Aug 2017 14:15

Last Modified:

13 Aug 2017 02:16

Publisher DOI:

10.1140/epjc/s10052-016-4176-8

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt.

BORIS DOI:

10.7892/boris.99975

URI:

https://boris.unibe.ch/id/eprint/99975

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