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Title: MIT bag model inspired partonic transverse momentum distribution for prompt photon production in pp collisions

Abstract

We consider the prompt photon production in pp collisions using, within the framework of perturbative QCD, a non-Gaussian distribution for the transverse momentum distribution of the partons inside the proton. Our description adopts the widely used in the literature factorization of the partonic momentum distribution into longitudinal and transverse components. It is argued that the non-Gaussian distribution of the intrinsic transverse momenta of the partons is dictated by the asymptotic freedom as well as the 3D confinement of the partons in the proton. To make this association more transparent we use the MIT bag model, which plainly incorporates both properties (asymptotic freedom, confinement), in order to determine in a simplified way the partonic transverse momentum distribution. A large set of data from six different experiments have been fitted with this simple description using as a single free parameter the mean partonic transverse momentum <k{sub T}>. Surprisingly enough, a perfect fit of the experimental data turns out to require <k{sub T}> values which are compatible with Heisenberg's uncertainty relation for the proton and decrease almost smoothly as a function of the scaled variable z=(p{sub T}/{radical}(s)), where p{sub T} is the transverse momentum of the final photon and {radical}(s) is the beammore » energy in the center of mass frame. Our analysis indicates that asymptotic freedom and 3D confinement may influence significantly the form of the partonic transverse momentum distribution leaving an imprint on the pp{yields}{gamma}+X cross section.« less

Authors:
; ;  [1]
  1. Department of Physics, University of Athens, GR-15771 Athens (Greece)
Publication Date:
OSTI Identifier:
21250731
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 78; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevD.78.054023; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMPTOTIC SOLUTIONS; BAG MODEL; BEAMS; CENTER-OF-MASS SYSTEM; CONFINEMENT; CROSS SECTIONS; DISTRIBUTION; FACTORIZATION; GAUSS FUNCTION; PARTICLE PRODUCTION; PERTURBATION THEORY; PHOTONS; PROTON-PROTON INTERACTIONS; QUANTUM CHROMODYNAMICS; TRANSVERSE MOMENTUM

Citation Formats

Diakonos, F K, Kaplis, N K, and Maintas, X N. MIT bag model inspired partonic transverse momentum distribution for prompt photon production in pp collisions. United States: N. p., 2008. Web. doi:10.1103/PHYSREVD.78.054023.
Diakonos, F K, Kaplis, N K, & Maintas, X N. MIT bag model inspired partonic transverse momentum distribution for prompt photon production in pp collisions. United States. https://doi.org/10.1103/PHYSREVD.78.054023
Diakonos, F K, Kaplis, N K, and Maintas, X N. Mon . "MIT bag model inspired partonic transverse momentum distribution for prompt photon production in pp collisions". United States. https://doi.org/10.1103/PHYSREVD.78.054023.
@article{osti_21250731,
title = {MIT bag model inspired partonic transverse momentum distribution for prompt photon production in pp collisions},
author = {Diakonos, F K and Kaplis, N K and Maintas, X N},
abstractNote = {We consider the prompt photon production in pp collisions using, within the framework of perturbative QCD, a non-Gaussian distribution for the transverse momentum distribution of the partons inside the proton. Our description adopts the widely used in the literature factorization of the partonic momentum distribution into longitudinal and transverse components. It is argued that the non-Gaussian distribution of the intrinsic transverse momenta of the partons is dictated by the asymptotic freedom as well as the 3D confinement of the partons in the proton. To make this association more transparent we use the MIT bag model, which plainly incorporates both properties (asymptotic freedom, confinement), in order to determine in a simplified way the partonic transverse momentum distribution. A large set of data from six different experiments have been fitted with this simple description using as a single free parameter the mean partonic transverse momentum <k{sub T}>. Surprisingly enough, a perfect fit of the experimental data turns out to require <k{sub T}> values which are compatible with Heisenberg's uncertainty relation for the proton and decrease almost smoothly as a function of the scaled variable z=(p{sub T}/{radical}(s)), where p{sub T} is the transverse momentum of the final photon and {radical}(s) is the beam energy in the center of mass frame. Our analysis indicates that asymptotic freedom and 3D confinement may influence significantly the form of the partonic transverse momentum distribution leaving an imprint on the pp{yields}{gamma}+X cross section.},
doi = {10.1103/PHYSREVD.78.054023},
url = {https://www.osti.gov/biblio/21250731}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 5,
volume = 78,
place = {United States},
year = {2008},
month = {9}
}