A search for long-lived low mass states coupling to e sup + e sup minus

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:7095980

Henderson, S D; Greenberg, J S; McDonough, J; Phlips, B F ^[1]; Kumar, P A; Huomo, H; Lynn, K G; McCorkle, S; Vehanen, A; Weber, M ^[2]

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1. Yale Univ., New Haven, CT (USA). Wright Nuclear Structure Lab.
2. Brookhaven National Lab., Upton, NY (USA)

Since the observation by the EPOS group at GS in 1985 of correlated electron-positron pair emission in superheavy ion-atom collision systems there have been many attempts to explain the phenomenon. The EPOS coincidence data show a series of narrow sum-energy lines in the laboratory kinetic energy range 610--820 keV. Recently, similar observations were reported by another group. For lack of conventional explanations for the narrow sum peaks, the production of a previously unobserved neutral system in the heavy ion collision which subsequently decays to e{sup +}e{sup {minus}} was considered as a possibility. If such an object were to exist, then it should be possible to produce it through the s-channel of ordinary electron-positron scattering. We describe the results of a set of experiments to search for such a neutral object directly in e{sup +}e{sup {minus}} collisions.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC02-76CH00016; AC02-76ER03074
• OSTI ID: 7095980
• Report Number(s): BNL-44713; CONF-900601--1; ON: DE90012870
• Country of Publication: United States
• Language: English

Related Subjects

645100 -- High Energy Physics-- Particle Interactions & Properties-Experimental
651000* -- Nuclear Physics
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BHABHA SCATTERING
CHARGED-PARTICLE REACTIONS
ELASTIC SCATTERING
ELECTRON-POSITRON INTERACTIONS
ENERGY LEVELS
EXCITED STATES
HEAVY ION REACTIONS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LIFETIME
NUCLEAR REACTIONS
PARTICLE INTERACTIONS
S CHANNEL
SCATTERING