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Title: High p{sub T} direct photon and {pi}{sup 0} triggered azimuthal jet correlations and measurement of k{sub T} for isolated direct photons in p+p collisions at {radical}(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];  [3]; ; ;  [4]
  1. University of Colorado, Boulder, Colorado 80309 (United States)
  2. Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region (Russian Federation)
  3. Columbia University, New York, New York 10027 and Nevis Laboratories, Irvington, New York 10533 (United States)
  4. Chemistry Department, Stony Brook University, SUNY, Stony Brook, New York 11794-3400 (United States)
Publication Date:
OSTI Identifier:
21421335
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 82; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevD.82.072001; (c) 2010 American Institute of Physics; Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; COLLISIONS; COMPTON EFFECT; CORRELATIONS; FRAGMENTATION; GEV RANGE 100-1000; GLUONS; PHOTONS; PIONS NEUTRAL; PROTON-PROTON INTERACTIONS; QUARK-GLUON INTERACTIONS; QUARKS; SCATTERING; SENSITIVITY; SPECTRA; TRANSVERSE MOMENTUM; BARYON-BARYON INTERACTIONS; BASIC INTERACTIONS; BOSONS; ELASTIC SCATTERING; ELECTROMAGNETIC INTERACTIONS; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; GEV RANGE; HADRON-HADRON INTERACTIONS; HADRONS; INTERACTIONS; LINEAR MOMENTUM; MASSLESS PARTICLES; MESONS; NUCLEON-NUCLEON INTERACTIONS; PARTICLE INTERACTIONS; PIONS; PROTON-NUCLEON INTERACTIONS; PSEUDOSCALAR MESONS

Citation Formats

Adare, A, Bickley, A A, Ellinghaus, F, Glenn, A, Kinney, E, Kiriluk, K, Nagle, J L, Seele, J, Wysocki, M, Afanasiev, S, Isupov, A, Litvinenko, A, Malakhov, A, Peresedov, V, Rukoyatkin, P, Zolin, L, Aidala, C, Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003-9337, Ajitanand, N N, Alexander, J, and Chung, P. High p{sub T} direct photon and {pi}{sup 0} triggered azimuthal jet correlations and measurement of k{sub T} for isolated direct photons in p+p collisions at {radical}(s)=200 GeV. United States: N. p., 2010. Web. doi:10.1103/PHYSREVD.82.072001.
Adare, A, Bickley, A A, Ellinghaus, F, Glenn, A, Kinney, E, Kiriluk, K, Nagle, J L, Seele, J, Wysocki, M, Afanasiev, S, Isupov, A, Litvinenko, A, Malakhov, A, Peresedov, V, Rukoyatkin, P, Zolin, L, Aidala, C, Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003-9337, Ajitanand, N N, Alexander, J, & Chung, P. High p{sub T} direct photon and {pi}{sup 0} triggered azimuthal jet correlations and measurement of k{sub T} for isolated direct photons in p+p collisions at {radical}(s)=200 GeV. United States. https://doi.org/10.1103/PHYSREVD.82.072001
Adare, A, Bickley, A A, Ellinghaus, F, Glenn, A, Kinney, E, Kiriluk, K, Nagle, J L, Seele, J, Wysocki, M, Afanasiev, S, Isupov, A, Litvinenko, A, Malakhov, A, Peresedov, V, Rukoyatkin, P, Zolin, L, Aidala, C, Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003-9337, Ajitanand, N N, Alexander, J, and Chung, P. Fri . "High p{sub T} direct photon and {pi}{sup 0} triggered azimuthal jet correlations and measurement of k{sub T} for isolated direct photons in p+p collisions at {radical}(s)=200 GeV". United States. https://doi.org/10.1103/PHYSREVD.82.072001.
@article{osti_21421335,
title = {High p{sub T} direct photon and {pi}{sup 0} triggered azimuthal jet correlations and measurement of k{sub T} for isolated direct photons in p+p collisions at {radical}(s)=200 GeV},
author = {Adare, A and Bickley, A A and Ellinghaus, F and Glenn, A and Kinney, E and Kiriluk, K and Nagle, J L and Seele, J and Wysocki, M and Afanasiev, S and Isupov, A and Litvinenko, A and Malakhov, A and Peresedov, V and Rukoyatkin, P and Zolin, L and Aidala, C and Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003-9337 and Ajitanand, N N and Alexander, J and Chung, P},
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/21421335}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 7,
volume = 82,
place = {United States},
year = {2010},
month = {10}
}