Search for low-mass states in elastic e sup + e minus scattering
Journal Article
·
· Physical Review Letters; (United States)
- Department of Physics, Brookhaven National Laboratory, Upton, New York, 11973 (United States) A. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511 (United States) Department of Physics, City College of New York, New York, 10031 (United States)
We report results of an experiment to search for a resonance enhancement of the {ital e}{sup +}{ital e{minus}} scattering cross section in a metallic Li target utilizing an energy-tunable monoenergetic positron beam. Within statistical uncertainties (0.27%) no evidence has been observed for deviations from Bhabha scattering over the entire invariant-mass region 1560 keV/{ital c}{sup 2}{lt}{ital M}{sub {ital X}}{sup 0}{lt}1860 keV/{ital c}{sup 2} that can be associated with the {ital e}{sup +}{ital e{minus}} sum-peak energies in GSI heavy-ion experiments. Under the assumptions that the {ital e}{sup +}{ital e{minus}} channel dominates, we deduce lower limits on lifetimes {tau}{gt}3.3{times}10{sup {minus}13} sec ({ital J}=0) and {tau}{gt}8.2{times}10{sup {minus}13} sec ({ital J}=1), at 90% C.L.
- DOE Contract Number:
- AC02-76CH00016; AC02-76ER03074
- OSTI ID:
- 7002191
- Journal Information:
- Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 69:12; ISSN PRLTA; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
662310* -- Weak & Electromagnetic Interactions of Leptons-- (1992-)
662440 -- Properties of Other Particles Including Hypothetical Particles-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BHABHA SCATTERING
CROSS SECTIONS
DATA
ELASTIC SCATTERING
ELECTRON-POSITRON INTERACTIONS
ENERGY RANGE
ENERGY SPECTRA
EXPERIMENTAL DATA
INFORMATION
INTERACTIONS
KEV RANGE
KEV RANGE 100-1000
LEPTON-LEPTON INTERACTIONS
LIMITING VALUES
MEV RANGE
MEV RANGE 01-10
MONTE CARLO METHOD
MOTT SCATTERING
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
SCATTERING
SPECTRA
UNITARITY
662440 -- Properties of Other Particles Including Hypothetical Particles-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BHABHA SCATTERING
CROSS SECTIONS
DATA
ELASTIC SCATTERING
ELECTRON-POSITRON INTERACTIONS
ENERGY RANGE
ENERGY SPECTRA
EXPERIMENTAL DATA
INFORMATION
INTERACTIONS
KEV RANGE
KEV RANGE 100-1000
LEPTON-LEPTON INTERACTIONS
LIMITING VALUES
MEV RANGE
MEV RANGE 01-10
MONTE CARLO METHOD
MOTT SCATTERING
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
SCATTERING
SPECTRA
UNITARITY