Search for direct gamma production at low transverse momentum in 63-GeV pp collisions

Journal Article · Sun Nov 01 04:00:00 EST 1987 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.36.2615· OSTI ID:5946618

Akesson, T; Albrow, c M.G.; Almehed, k S; Anassontzis, m E; Batley, l R; Benary, c O; Boggild, p H; Botner, f O; Breuker, f H; Burkert, c V; others, and

We have searched for direct photons of low P/sub T/ (less than or equal to1.0 GeV/c) at theta/sub c.m./ = 90/sup 0/ in pp collisions at ..sqrt..s = 63 GeV. We used two independent methods: direct detection in NaI crystals and conversion to e/sup +/e/sup -/ pairs. No signal is observed; the photon spectrum is well described by the decay of hadrons. The result is consistent with a direct low-P/sub T/ photon signal reported at ..sqrt..s = 12 GeV, but excludes a rapid growth of soft-photon production with ..sqrt..s .

• Research Organization: aBrookhaven National Laboratory, Upton, New York 11973
• OSTI ID: 5946618
• Journal Information: Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 36:9; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645103* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BARYON-BARYON INTERACTIONS
BREMSSTRAHLUNG
CENTER-OF-MASS SYSTEM
DECAY
DISTRIBUTION
DRIFT CHAMBERS
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
GEV RANGE
GEV RANGE 10-100
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
ISABELLE STORAGE RINGS
LEPTONS
LINEAR MOMENTUM
MASSLESS PARTICLES
MEASURING INSTRUMENTS
MULTIWIRE PROPORTIONAL CHAMBERS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE IDENTIFICATION
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTONS
POSITRONS
PROPORTIONAL COUNTERS
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
RADIATION DETECTORS
RADIATIONS
SPECTROMETERS
STORAGE RINGS
TRANSVERSE MOMENTUM