Search in s channel for production of 1--2 MeV/ c sup 2 long-lived e sup + e minus resonances
Journal Article
·
· Physical Review Letters; (United States)
- A. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511 (United States) Department of Physics, Brookhaven National Laboratory, Upton, New York 11973 (United States)
The search for {ital s}-channel production of light neutral particles coupled to {ital e}{sup +}{ital e{minus}} has been extended by more than 3 orders of magnitude in lifetime beyond the region which is accessible to elastic {ital e}{sup +}{ital e{minus}} scattering. The whole mass range 1500{approx lt}{ital M}{sub {ital X}}{sup 0}{approx lt}1860 keV/{ital c}{sup 2} suggested by the observation of anomalous {ital e}{sup +}{ital e{minus}} pairs in heavy-ion collisions has been investigated. These measurements find no evidence for {ital e}{sup +}{ital e{minus}} states within lifetime ranges (90% C.L.) of 1.4{times}10{sup {minus}12}{approx lt}{tau}{approx lt}4{times}10{sup {minus}10} sec ({ital J}=0) and 1.4{times}10{sup {minus}12}{approx lt}{tau}{approx lt}6{times}10{sup {minus}10} sec ({ital J}=1), assuming that the state does not break up by interacting within the target.
- DOE Contract Number:
- AC02-76CH00016; AC02-76ER03074
- OSTI ID:
- 7030170
- 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
ANNIHILATION
BASIC INTERACTIONS
DATA
DATA ANALYSIS
ELECTROMAGNETIC INTERACTIONS
ELECTRON-POSITRON INTERACTIONS
ENERGY RANGE
EXPERIMENTAL DATA
INFORMATION
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LIMITING VALUES
MASS SPECTRA
MEV RANGE
MEV RANGE 01-10
MONTE CARLO METHOD
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
SPECTRA
662440 -- Properties of Other Particles Including Hypothetical Particles-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
BASIC INTERACTIONS
DATA
DATA ANALYSIS
ELECTROMAGNETIC INTERACTIONS
ELECTRON-POSITRON INTERACTIONS
ENERGY RANGE
EXPERIMENTAL DATA
INFORMATION
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LIMITING VALUES
MASS SPECTRA
MEV RANGE
MEV RANGE 01-10
MONTE CARLO METHOD
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
SPECTRA