Event topology of anomalous e+ e- pair production in 17 Gev/c. pi. /sup -/p collisions

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1981

OSTI ID:5468903

Adams, M R

This dissertation reports the results of an experiment which measured e+ e- production in ..pi../sup -/p collisions. The experiment was conducted at the Multiparticle Spectrometer at Brookhaven National Laboratory. Electron identification was provided by two transition radiation detectors and lead-scintillator shower detectors. Electron pairs with x/sub f/ > .3 were accepted with all p/sub T/ pair masses. Charged and neutral associated particles were observed over nearly the entire 4..pi.. solid angle. We have observed electron pairs with masses up to 1.5 GeV. A clear rho, omega signal is seen and below 600 MeV and x/sub f/ < .5, an excess of events over those expected from eta, and omega Dalitz decays. The anomaly is peaked at x/sub f/, low P/sub T/, and small mass. The associated photon and charged track multiplicities are presented and effective mass combinations of those photons or charged particles and the electron pair are examined. No enhancements in specific particle states are observed and no specific decays can explain the measured anomaly.

• Research Organization: State Univ. of New York, Stony Brook (USA)
• OSTI ID: 5468903
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions &amp; Properties-Experimental-- Electromagnetic Interactions &amp; Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
DATA
ELECTRON PAIRS
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
FERMIONS
GEV RANGE
GEV RANGE 10-100
HADRON-HADRON INTERACTIONS
INFORMATION
INTERACTIONS
LEPTONS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
NUMERICAL DATA
PAIR PRODUCTION
PARTICLE INTERACTIONS
PION MINUS-PROTON INTERACTIONS
PION-NUCLEON INTERACTIONS
PION-PROTON INTERACTIONS
POSITRONS