Measurement of the underlying event in jet events from 7 TeV proton–proton collisions with the ATLAS detector

Distributions sensitive to the underlying event in QCD jet events have been measured with the ATLAS detector at the LHC, based on 37 pb<SUP>-1</SUP> of proton–proton collision data collected at a centre-of-mass energy of 7 TeV. Charged-particle mean p<SUB>T</SUB> and densitie...

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Autores principales: Alconada Verzini, María Josefina, Alonso, Francisco, Anduaga, Xabier Sebastián, Dova, María Teresa, Monticelli, Fernando Gabriel, Tripiana, Martín Fernando, The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85091
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id I19-R120-10915-85091
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
proton–proton collisions
ATLAS detector
spellingShingle Ciencias Exactas
Física
proton–proton collisions
ATLAS detector
Alconada Verzini, María Josefina
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
Measurement of the underlying event in jet events from 7 TeV proton–proton collisions with the ATLAS detector
topic_facet Ciencias Exactas
Física
proton–proton collisions
ATLAS detector
description Distributions sensitive to the underlying event in QCD jet events have been measured with the ATLAS detector at the LHC, based on 37 pb<SUP>-1</SUP> of proton–proton collision data collected at a centre-of-mass energy of 7 TeV. Charged-particle mean p<SUB>T</SUB> and densities of all-particle E<SUB>T</SUB> and charged-particle multiplicity and p<SUB>T</SUB> have been measured in regions azimuthally transverse to the hardest jet in each event. These are presented both as one-dimensional distributions and with their mean values as functions of the leading-jet transverse momentum from 20 to 800 GeV. The correlation of charged-particle mean p<SUB>T</SUB> with charged-particle multiplicity is also studied, and the E<SUB>T</SUB> densities include the forward rapidity region; these features provide extra data constraints for Monte Carlo modelling of colour reconnection and beam-remnant effects respectively. For the first time, underlying event observables have been computed separately for inclusive jet and exclusive dijet event selections, allowing more detailed study of the interplay of multiple partonic scattering and QCD radiation contributions to the underlying event. Comparisons to the predictions of different Monte Carlo models show a need for further model tuning, but the standard approach is found to generally reproduce the features of the underlying event in both types of event selection.
format Articulo
Articulo
author Alconada Verzini, María Josefina
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
author_facet Alconada Verzini, María Josefina
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
author_sort Alconada Verzini, María Josefina
title Measurement of the underlying event in jet events from 7 TeV proton–proton collisions with the ATLAS detector
title_short Measurement of the underlying event in jet events from 7 TeV proton–proton collisions with the ATLAS detector
title_full Measurement of the underlying event in jet events from 7 TeV proton–proton collisions with the ATLAS detector
title_fullStr Measurement of the underlying event in jet events from 7 TeV proton–proton collisions with the ATLAS detector
title_full_unstemmed Measurement of the underlying event in jet events from 7 TeV proton–proton collisions with the ATLAS detector
title_sort measurement of the underlying event in jet events from 7 tev proton–proton collisions with the atlas detector
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/85091
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