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Measurement of direct photon production at large transverse momentum in. pi. /sup -/p,. pi. /sup +/p, and pp collisions at 300 GeV/c

Journal Article · · Phys. Rev. D; (United States)
; ; ; ; ; ; ; ; ; ;
Cross sections for inclusive direct photon production in ..pi../sup -/p, ..pi../sup +/p, and pp collisions at 300 GeV/c are measured at transverse momenta p/sub T/ up to 7 GeV/c (x/sub T/ = 0.6). For ..pi../sup -/p..--> gamma..X also the rapidity distribution is presented. The cross-section ratio sigma(..pi../sup -/p..--> gamma..X)/sigma(..pi../sup +/p..--> gamma..X) is found to be 1 at p/sub T/ = 4 GeV/c and rises with increasing p/sub T/. This observation signals the occurrence of valence-quark--antiquark annihilation. The results are in good agreement with QCD predictions.
Research Organization:
Dipartimento di Fisica dell'Universita di Bari and Istituto Nazionale di Fisica Nucleare, Bari, Italy
OSTI ID:
5892967
Journal Information:
Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 36:1; ISSN PRVDA
Country of Publication:
United States
Language:
English

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Related Subjects

645103* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
BARYON-BARYON INTERACTIONS
BASIC INTERACTIONS
CHERENKOV COUNTERS
CROSS SECTIONS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FIELD THEORIES
GEV RANGE
GEV RANGE 100-1000
HADRON-HADRON INTERACTIONS
HYDROGEN
INCLUSIVE INTERACTIONS
INTERACTIONS
LINEAR MOMENTUM
MASSLESS PARTICLES
MEASURING INSTRUMENTS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
NONMETALS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PARTICLE RAPIDITY
PHOTONS
PION MINUS-PROTON INTERACTIONS
PION PLUS-PROTON INTERACTIONS
PION-NUCLEON INTERACTIONS
PION-PROTON INTERACTIONS
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK-ANTIQUARK INTERACTIONS
RADIATION DETECTORS
TRANSVERSE MOMENTUM