High P{sub T} production of neutral mesons and direct photons

Journal Article · Thu May 01 04:00:00 EDT 1997 · AIP Conference Proceedings

OSTI ID:627696

Ginther, G ^[1]

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1. University of Rochester, Rochester, New York14627 (United States)

Perturbative QCD (pQCD) calculations of the inclusive production of mesons and direct photons at high p{sub T} have been tested using high-statistics measurements from Fermilab experiment E706. Inclusive {pi}{sup 0} and direct-{gamma} cross sections in the kinematic range 3.5{lt}p{sub T}{lt}12GeV/c with central rapidities have been measured for 530 and 800GeV/c proton beams and a 515GeV/c{pi}{sup {minus}} beam incident on nuclear targets. Current Next-to-Leading Log (NLL) pQCD calculations fail to describe the data for usual choices of scales. Other aspects of our data indicate the presence of a substantial initial state parton transverse momentum (k{sub T}) in the hard scattering. Incorporating a kinematic model of k{sub T} effects improves the agreement between the calculations and the measured cross sections. Gluon distributions are extracted from Deep Inelastic Scattering (DIS). Drell-Yan (DY), and our direct-{gamma} data using fitting procedures similar to those used by the CTEQ collaboration; jet cross section calculations using this gluon distribution function are consistent with D0 and CDF measurements. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 627696
• Report Number(s): CONF-970564--
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 412; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BERYLLIUM 9 TARGET
DIFFERENTIAL CROSS SECTIONS
GEV RANGE 100-1000
INCLUSIVE INTERACTIONS
PARTICLE PRODUCTION
PERTURBATION THEORY
PHOTONS
PION MINUS REACTIONS
PIONS NEUTRAL
PROTON REACTIONS
QUANTUM CHROMODYNAMICS