Extraction of jet properties from two particle azimuthal correlations in pp and AuAu collisions at [square root of s subscript NN] = 200 GeV

dc.contributor.advisor John G. Lajoie
dc.contributor.author Constantin, Paul
dc.contributor.department Physics and Astronomy
dc.date 2018-08-24T17:57:22.000
dc.date.accessioned 2020-06-30T07:13:34Z
dc.date.available 2020-06-30T07:13:34Z
dc.date.copyright Thu Jan 01 00:00:00 UTC 2004
dc.date.issued 2004-01-01
dc.description.abstract <p>Two particle azimuthal correlation functions measured in pp and AuAu collisions at sNN = 200 GeV at midrapidity with the central arms of the PHENIX detector are analyzed in order to extract the properties of hadronic jets produced in QCD vacuum and highly excited QCD media, like the jet shape parameters jT and kT, the jet conditional yields (number of associated hadrons per high pT trigger hadron) and the jet fragmentation function.;The analysis of pp data starts with the measurement of the vacuum fragmentation function from which the pT dependence of the mean fragmentation momentum fraction 〈z〉 is extracted. We obtain a constant value of 〈z〉 = 0.74 +/- 0.02 for pT above 3 GeV/c. Soft (non-perturbative) parton fragmentation becomes significant below 3 GeV/c and the slope of the fragmentation function is pT dependent in this region. Gaussian fits to jet induced azimuthal correlations are employed to measure the mean jet fragmentation transverse momentum 〈| jTy|〉 = 359 +/- 11 (stat) +/- 6 (syst) MeV/c and the mean partonic transverse momentum 〈|k Ty|〉 = 964 +/- 49 (stat) +/- 16 (syst) MeV/c.;The analysis of AuAu data is based on azimuthal correlation functions between charged hadrons in the 1.5--3 GeV/c and 3--5 GeV/c pT regions in five classes of collision centrality. The mean jet fragmentation transverse momentum 〈|jTy|〉 is centrality independent and consistent with the value in pp data mentioned above. A strong broadening with the centrality of the extracted mean partonic transverse momentum 〈|kTy|〉 (multiplied by 〈ztrigg〉) is observed. This is an important finding because hadronic jet quenching through energy loss is expected to be accompanied by a broadening effect.;Another important finding is that the jet conditional yields in both the near (Delta&phis; ~ 0) and away (Delta&phis; ~ pi) regions exhibit a slightly raising trend with centrality. This was also expected to accompany the jet quenching found at higher pT based on simple energy conservation considerations.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/1152/
dc.identifier.articleid 2151
dc.identifier.contextkey 6090586
dc.identifier.doi https://doi.org/10.31274/rtd-180813-12558
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/1152
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/64786
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/1152/r_3158324.pdf|||Fri Jan 14 18:52:17 UTC 2022
dc.subject.disciplines Elementary Particles and Fields and String Theory
dc.subject.disciplines Nuclear
dc.subject.keywords Physics and astronomy
dc.subject.keywords Nuclear physics
dc.title Extraction of jet properties from two particle azimuthal correlations in pp and AuAu collisions at [square root of s subscript NN] = 200 GeV
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication 4a05cd4d-8749-4cff-96b1-32eca381d930
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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