Observed differences in event structures of high-p/sub T/. pi. /sup 0/ and single photon events produced in pp collisions at the CERN ISR. [. sqrt. s = 31 to 63 GeV, p/sub T/ up to 9 GeV]

Conference · Tue Jan 01 00:00:00 EST 1980

OSTI ID:6847690

Rahm, D C

The direct photon production in pp collisions for c.m. energies 31 less than or equal to 63 GeV and transverse momenta of up to 9 GeV/c were measured at the ISR by use of a segmented lead/liquid argon calorimeter. The observed ..gamma../..pi../sup 0/ ratio was found to be a significantly larger than zero at 4 GeV/c in p/sub T/, increasing to 0.4 at 9 GeV/c. The average multiplicity on the trigger side for the single-photon events was found to be significantly lower than for ..pi../sup 0/ events. The correlations in ..delta..y and ..delta..phi between the trigger particle and an additional particle were found to differe mainly at small ..delta..y and ..delta..phi. 3 figures.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6847690
• Report Number(s): BNL-28452; CONF-800724-50; TRN: 80-018961
• Resource Relation: Conference: 20. international conference on high energy physics, Madison, WI, USA, 17 Jul 1980
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PHOTONS
MULTIPLE PRODUCTION
PIONS NEUTRAL
PROTON-PROTON INTERACTIONS
CORRELATIONS
EXPERIMENTAL DATA
GEV RANGE 10-100
MULTIPLICITY
SHOWER COUNTERS
BARYON-BARYON INTERACTIONS
BOSONS
DATA
ELEMENTARY PARTICLES
ENERGY RANGE
GEV RANGE
HADRON-HADRON INTERACTIONS
HADRONS
INFORMATION
INTERACTIONS
MASSLESS PARTICLES
MEASURING INSTRUMENTS
MESONS
NUCLEON-NUCLEON INTERACTIONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PIONS
PROTON-NUCLEON INTERACTIONS
PSEUDOSCALAR MESONS
RADIATION DETECTORS
645103* - High Energy Physics- Particle Interactions & Properties-Experimental- Strong Interactions & Baryon & Meson Properties