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Title: High p T Direct Photon and pi 0 Triggered Azimuthal Jet Correlations and Measurement of k T for Isolated Direct Photons in p+p Collisions at s = 200 GeV

Abstract

Correlations of charged hadrons of 1 < p{sub T} < 10 Gev/c with high p{sub T} direct photons and {pi}{sup 0} mesons in the range 5 < p{sub T} < 15 Gev/c are used to study jet fragmentation in the {gamma} + jet and dijet channels, respectively. The magnitude of the partonic transverse momentum, k{sub T}, is obtained by comparing to a model incorporating a Gaussian k{sub T} smearing. The sensitivity of the associated charged hadron spectra to the underlying fragmentation function is tested and the data are compared to calculations using recent global fit results. The shape of the direct photon-associated hadron spectrum as well as its charge asymmetry are found to be consistent with a sample dominated by quark-gluon Compton scattering. No significant evidence of fragmentation photon correlated production is observed within experimental uncertainties.

Authors:
 [1];  [2];  [2];  [3];  [4];  [2];  [2];  [5];  [2]
  1. University of Colorado, Boulder
  2. ORNL
  3. University of Tennessee, Knoxville (UTK) & Oak Ridge National Laboratory (ORNL)
  4. Oak Ridge National Laboratory (ORNL)
  5. University of Tennessee, Knoxville (UTK)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
990231
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 82; Journal Issue: 7; Journal ID: ISSN 1550-7998
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; COMPTON EFFECT; FRAGMENTATION; HADRONS; MESONS; PHOTONS; PRODUCTION; SENSITIVITY; SHAPE; SPECTRA; TRANSVERSE MOMENTUM

Citation Formats

Adare, A, Awes, Terry C, Cianciolo, Vince, Efremenko, Yuri, Enokizono, Akitomo, Read, Jr, Kenneth F, Silvermyr, David O, Sorensen, Soren P, Stankus, Paul W, and PHENIX, Collaboration. High pT Direct Photon and pi0 Triggered Azimuthal Jet Correlations and Measurement of kT for Isolated Direct Photons in p+p Collisions at s = 200 GeV. United States: N. p., 2010. Web. doi:10.1103/PhysRevD.82.072001.
Adare, A, Awes, Terry C, Cianciolo, Vince, Efremenko, Yuri, Enokizono, Akitomo, Read, Jr, Kenneth F, Silvermyr, David O, Sorensen, Soren P, Stankus, Paul W, & PHENIX, Collaboration. High pT Direct Photon and pi0 Triggered Azimuthal Jet Correlations and Measurement of kT for Isolated Direct Photons in p+p Collisions at s = 200 GeV. United States. https://doi.org/10.1103/PhysRevD.82.072001
Adare, A, Awes, Terry C, Cianciolo, Vince, Efremenko, Yuri, Enokizono, Akitomo, Read, Jr, Kenneth F, Silvermyr, David O, Sorensen, Soren P, Stankus, Paul W, and PHENIX, Collaboration. Fri . "High pT Direct Photon and pi0 Triggered Azimuthal Jet Correlations and Measurement of kT for Isolated Direct Photons in p+p Collisions at s = 200 GeV". United States. https://doi.org/10.1103/PhysRevD.82.072001.
@article{osti_990231,
title = {High pT Direct Photon and pi0 Triggered Azimuthal Jet Correlations and Measurement of kT for Isolated Direct Photons in p+p Collisions at s = 200 GeV},
author = {Adare, A and Awes, Terry C and Cianciolo, Vince and Efremenko, Yuri and Enokizono, Akitomo and Read, Jr, Kenneth F and Silvermyr, David O and Sorensen, Soren P and Stankus, Paul W and PHENIX, Collaboration},
abstractNote = {Correlations of charged hadrons of 1 < p{sub T} < 10 Gev/c with high p{sub T} direct photons and {pi}{sup 0} mesons in the range 5 < p{sub T} < 15 Gev/c are used to study jet fragmentation in the {gamma} + jet and dijet channels, respectively. The magnitude of the partonic transverse momentum, k{sub T}, is obtained by comparing to a model incorporating a Gaussian k{sub T} smearing. The sensitivity of the associated charged hadron spectra to the underlying fragmentation function is tested and the data are compared to calculations using recent global fit results. The shape of the direct photon-associated hadron spectrum as well as its charge asymmetry are found to be consistent with a sample dominated by quark-gluon Compton scattering. No significant evidence of fragmentation photon correlated production is observed within experimental uncertainties.},
doi = {10.1103/PhysRevD.82.072001},
url = {https://www.osti.gov/biblio/990231}, journal = {Physical Review D},
issn = {1550-7998},
number = 7,
volume = 82,
place = {United States},
year = {2010},
month = {1}
}