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Title: High pT direct photon and π0 triggered azimuthal jet correlations and measurement of kT for isolated direct photons in p + p collisions at √S = 200 GeV

Abstract

Correlations of charged hadrons of 1 < p{sub T} < 10Gev/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:
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) Relativistic Heavy Ion Collider
Sponsoring Org.:
DOE - Office Of Science
OSTI Identifier:
993057
Report Number(s):
BNL-94210-2010-JA
Journal ID: ISSN 1550-7998; PRVDAQ; R&D Project: PO 003; KB0201021; TRN: US1007909
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
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; PHOTONS; TRANSVERSE MOMENTUM; PROTON-PROTON INTERACTIONS; PIONS NEUTRAL; HADRONS; JETS; relativistic heavy ion collider

Citation Formats

Adare, A, and PHENIX Collaboration. High pT direct photon and π0 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, & PHENIX Collaboration. High pT direct photon and π0 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, and PHENIX Collaboration. Tue . "High pT direct photon and π0 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_993057,
title = {High pT direct photon and π0 triggered azimuthal jet correlations and measurement of kT for isolated direct photons in p + p collisions at √S = 200 GeV},
author = {Adare, A and PHENIX Collaboration},
abstractNote = {Correlations of charged hadrons of 1 < p{sub T} < 10Gev/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/993057}, journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
issn = {1550-7998},
number = 7,
volume = 82,
place = {United States},
year = {2010},
month = {10}
}