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Studies of jet quenching in PbPb collisions at sqrt(s) = 2.76TeV

JStudying the interaction of fast partons with the exotic matter produced in high-energy heavy ion collisions can help to elucidate the properties of the produced medium. The high resolution calorimeters and high precision silicon tracker in the Compact Muon Solenoid detector at the Large Hadron Col...

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Autor principal: Stephans, George
Lenguaje:eng
Publicado: 2011
Materias:
Acceso en línea:http://cds.cern.ch/record/1389887
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author Stephans, George
author_facet Stephans, George
author_sort Stephans, George
collection CERN
description JStudying the interaction of fast partons with the exotic matter produced in high-energy heavy ion collisions can help to elucidate the properties of the produced medium. The high resolution calorimeters and high precision silicon tracker in the Compact Muon Solenoid detector at the Large Hadron Collider (LHC) make it ideal for investigating these hard scattering processes. The first heavy ion run at the LHC provided PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV. Parton energy loss should result in a significant dijet transverse momentum imbalance, when comparing to a pp reference distribution. A large imbalance is, in fact, observed in the PbPb data, with the magnitude of the effect increasing with centrality. The details of the energy loss process were studied using the transverse momentum balance of charged tracks projected onto the direction of the leading jet. In contrast to pp collisions, low momentum particles emitted at large angles with respect to the jet axis constitute a large fraction of the momentum balance for asymmetric dijets in PbPb collisions. Fragmentation functions for leading and subleading jets were extracted and were observed to be unmodified compared to those in pp. These data provide a wealth of information on the propagation of hard partons through hot QCD matter.
id cern-1389887
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2011
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spelling cern-13898872019-09-30T06:29:59Zhttp://cds.cern.ch/record/1389887engStephans, GeorgeStudies of jet quenching in PbPb collisions at sqrt(s) = 2.76TeVDetectors and Experimental TechniquesJStudying the interaction of fast partons with the exotic matter produced in high-energy heavy ion collisions can help to elucidate the properties of the produced medium. The high resolution calorimeters and high precision silicon tracker in the Compact Muon Solenoid detector at the Large Hadron Collider (LHC) make it ideal for investigating these hard scattering processes. The first heavy ion run at the LHC provided PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV. Parton energy loss should result in a significant dijet transverse momentum imbalance, when comparing to a pp reference distribution. A large imbalance is, in fact, observed in the PbPb data, with the magnitude of the effect increasing with centrality. The details of the energy loss process were studied using the transverse momentum balance of charged tracks projected onto the direction of the leading jet. In contrast to pp collisions, low momentum particles emitted at large angles with respect to the jet axis constitute a large fraction of the momentum balance for asymmetric dijets in PbPb collisions. Fragmentation functions for leading and subleading jets were extracted and were observed to be unmodified compared to those in pp. These data provide a wealth of information on the propagation of hard partons through hot QCD matter.CMS-CR-2011-161oai:cds.cern.ch:13898872011-08-31
spellingShingle Detectors and Experimental Techniques
Stephans, George
Studies of jet quenching in PbPb collisions at sqrt(s) = 2.76TeV
title Studies of jet quenching in PbPb collisions at sqrt(s) = 2.76TeV
title_full Studies of jet quenching in PbPb collisions at sqrt(s) = 2.76TeV
title_fullStr Studies of jet quenching in PbPb collisions at sqrt(s) = 2.76TeV
title_full_unstemmed Studies of jet quenching in PbPb collisions at sqrt(s) = 2.76TeV
title_short Studies of jet quenching in PbPb collisions at sqrt(s) = 2.76TeV
title_sort studies of jet quenching in pbpb collisions at sqrt(s) = 2.76tev
topic Detectors and Experimental Techniques
url http://cds.cern.ch/record/1389887
work_keys_str_mv AT stephansgeorge studiesofjetquenchinginpbpbcollisionsatsqrts276tev