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

Journal Article · Tue May 20 04:00:00 EDT 1997 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.54357· OSTI ID:21175438

Ginther, George ^[1]

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1. University of Rochester, Rochester, New York 14627 (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<p{sub T}<12 GeV/c with central rapidities have been measured for 530 and 800 GeV/c proton beams and a 515 GeV/c {pi}{sup -} 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.

• OSTI ID: 21175438
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 412; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CROSS SECTIONS
DEEP INELASTIC SCATTERING
DISTRIBUTION FUNCTIONS
DRELL MODEL
FERMILAB COLLIDER DETECTOR
GEV RANGE
GLUONS
INCLUSIVE INTERACTIONS
JET MODEL
PARTICLE RAPIDITY
PERTURBATION THEORY
PHOTONS
PIONS NEUTRAL
PROTON REACTIONS
QUANTUM CHROMODYNAMICS
QUARKS
STATISTICS
TRANSVERSE MOMENTUM