Study of prompt e/sup +/e/sup -/, eta/sup 0/, and. omega. /sup 0/ production in low-energy p-barp annihilations
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), Vol. 21:1
- Country of Publication:
- United States
- Language:
- English
Similar Records
Antiproton-proton annihilation at rest into {omega}{eta}{pi}{sup 0}
Measurement of the final states {omega}{pi}{sup 0}, {rho}{eta}, and {rho}{eta}{sup '} from {psi}(2S) electromagnetic decays and e{sup +}e{sup -}annihilations
Related Subjects
ETA MESONS
PARTICLE PRODUCTION
OMEGA-784 RESONANCES
PROMPT ELECTRONS
PAIR PRODUCTION
PROTON-ANTIPROTON INTERACTIONS
ANNIHILATION
BUBBLE CHAMBERS
GAMMA SPECTRA
INCLUSIVE INTERACTIONS
TRANSVERSE MOMENTUM
ZGS
ACCELERATORS
BARYON-BARYON INTERACTIONS
BASIC INTERACTIONS
BOSONS
CYCLIC ACCELERATORS
ELECTROMAGNETIC INTERACTIONS
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
GAS TRACK DETECTORS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
LEPTONS
LINEAR MOMENTUM
MEASURING INSTRUMENTS
MESON RESONANCES
MESONS
NUCLEON-ANTINUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PSEUDOSCALAR MESONS
RADIATION DETECTORS
RESONANCE PARTICLES
SPECTRA
SYNCHROTRONS
VECTOR MESONS
645205* - High Energy Physics- Particle Interactions & Properties-Theoretical- Strong Interactions
Baryon No. = 0- (-1987)