Study of prompt e/sup +/e/sup -/, eta/sup 0/, and. omega. /sup 0/ production in low-energy p-barp annihilations
Journal Article
·
· Phys. Rev., D; (United States)
A study of prompt e/sup +/e/sup -/ production has been made using the Argonne 12-foot bubble chamber exposed to a low-energy p-bar beam. We found eleven annihilation events with e/sup +/e/sup -/ pairs of invariant mass greater than the ..pi../sup 0/ mass. The background to direct e/sup +/e/sup -/ pair production comes mainly from eta/sup 0/ ..-->.. ..gamma..e/sup +/e/sup -/ and ..omega../sup 0/ ..-->.. ..pi../sup 0/e/sup +/e/sup -/ Dalitz pairs. To determine these backgrounds, we have measured the inclusive eta/sup 0/ and ..omega../sup 0/ production rates using externally converted ..gamma.. rays. We find ..omega../sup 0//..pi../sup 0/=0.20 +- 0.07 and eta/sup 0//..pi../sup 0/<0.11 at the 90% confidence level. The (eta/sup 0/+..omega../sup 0/) Dalitz background plus other small backgrounds yield 7.0/sup +4.4//sub -3.0/ events. The remaining events yield a 90%-confidence-level upper limit for the ratio of prompt e/sup +/e/sup -/ pairs to ..pi../sup 0/ production of 4 x 10/sup -5/.
- Research Organization:
- Argonne National Laboratory, Argonne, Illinois 60439
- OSTI ID:
- 5541958
- Journal Information:
- Phys. Rev., D; (United States), Journal Name: Phys. Rev., D; (United States) Vol. 21:1; ISSN PRVDA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
645205* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions
Baryon No. = 0-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
ANNIHILATION
BARYON-BARYON INTERACTIONS
BASIC INTERACTIONS
BOSONS
BUBBLE CHAMBERS
CYCLIC ACCELERATORS
ELECTROMAGNETIC INTERACTIONS
ELECTRONS
ELEMENTARY PARTICLES
ETA MESONS
FERMIONS
GAMMA SPECTRA
GAS TRACK DETECTORS
HADRON-HADRON INTERACTIONS
HADRONS
INCLUSIVE INTERACTIONS
INTERACTIONS
LEPTONS
LINEAR MOMENTUM
MEASURING INSTRUMENTS
MESON RESONANCES
MESONS
NUCLEON-ANTINUCLEON INTERACTIONS
OMEGA-784 RESONANCES
PAIR PRODUCTION
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PROMPT ELECTRONS
PROTON-ANTIPROTON INTERACTIONS
PSEUDOSCALAR MESONS
RADIATION DETECTORS
RESONANCE PARTICLES
SPECTRA
SYNCHROTRONS
TRANSVERSE MOMENTUM
VECTOR MESONS
ZGS
Baryon No. = 0-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
ANNIHILATION
BARYON-BARYON INTERACTIONS
BASIC INTERACTIONS
BOSONS
BUBBLE CHAMBERS
CYCLIC ACCELERATORS
ELECTROMAGNETIC INTERACTIONS
ELECTRONS
ELEMENTARY PARTICLES
ETA MESONS
FERMIONS
GAMMA SPECTRA
GAS TRACK DETECTORS
HADRON-HADRON INTERACTIONS
HADRONS
INCLUSIVE INTERACTIONS
INTERACTIONS
LEPTONS
LINEAR MOMENTUM
MEASURING INSTRUMENTS
MESON RESONANCES
MESONS
NUCLEON-ANTINUCLEON INTERACTIONS
OMEGA-784 RESONANCES
PAIR PRODUCTION
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PROMPT ELECTRONS
PROTON-ANTIPROTON INTERACTIONS
PSEUDOSCALAR MESONS
RADIATION DETECTORS
RESONANCE PARTICLES
SPECTRA
SYNCHROTRONS
TRANSVERSE MOMENTUM
VECTOR MESONS
ZGS