Inclusive production of direct photons in 200-GeV/c collisions

Journal Article · Mon Sep 12 04:00:00 EDT 1983 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.51.971· OSTI ID:5666457

McLaughlin, M; Biel, J; Bromberg, C; Brown, B; Chandlee, C; Cihangir, S; Cooper, S R.W.; Ferbel, T; Garelick, D; Glass, G

The authors have measured the inclusive production of direct photons in the transverse momentum (p/sub T/) range 2.1--5.0 GeV/c in 200-GeV/c collisions of protons and ..pi../sup +/ mesons on a carbon target. A significant yield of direct photons was observed for p/sub T/>2.5 GeV/c. The invariant cross section for direct-photon production, when compared with measurements from the CERN intersecting storage rings, can be expressed in terms of p/sub T/ and x/sub T/ = 2p/sub T/root-bars as (42 +- 14)(1-x/sub T/)/sup 8.1plus-or-minus1.0/p /sub T//sup -6.6plus-or-minus0.3/..mu..b/GeV/sup 2/ for the c.m. energy range from ..sqrt..s = 19.4 to 63 GeV, and for the x/sub T/ range from 0.2 to 0.5.

• Research Organization: Fermilab, Batavia, Illinois 60510; Michigan State University, East Lansing, Michigan 48824; University of Minnesota, Minneapolis, Minnesota 55455; Northeastern University, Boston, Massachusetts 02115; and University of Rochester, Rochester, New York 14627
• OSTI ID: 5666457
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 51:11; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

645103* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
645104 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Meson-Induced Interactions-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYON REACTIONS
BASIC INTERACTIONS
BOSONS
CARBON
CERN ISR
CHARGED-PARTICLE REACTIONS
COMPTON EFFECT
CROSS SECTIONS
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
ENERGY SPECTRA
FIELD THEORIES
GEV RANGE
GEV RANGE 100-1000
HADRON REACTIONS
HADRONS
INCLUSIVE INTERACTIONS
INTERACTIONS
LINEAR MOMENTUM
MASSLESS PARTICLES
MESON REACTIONS
MESONS
MONTE CARLO METHOD
NONMETALS
NUCLEAR REACTIONS
NUCLEON REACTIONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTONS
PION PLUS REACTIONS
PION REACTIONS
PIONS
PIONS PLUS
PROTON REACTIONS
PSEUDOSCALAR MESONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SCATTERING
SPECTRA
STORAGE RINGS
TRANSVERSE MOMENTUM