Search for neutral metastable penetrating particles produced in the SLAC beam dump

Journal Article · Thu Dec 01 04:00:00 EST 1988 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.38.3375· OSTI ID:6642020

Bjorken, J D; Ecklund, S; Nelson, W R; Abashian, A; Church, C; Lu, B; Mo, L W; Nunamaker, T A; Rassmann, P

A search was made for neutral objects which might be produced by 20-GeV electrons incident on the SLAC beam dump, penetrate the downstream natural shielding, and decay upstream of an electromagnetic shower calorimeter. With about 30 C of electrons dumped, no candidate events were found above an energy of /similar to/ GeV. The 95%-confidence-level limit on the product of mass and lifetime of light axionlike bosons decaying primarily into two photons is determined to be greater than 1.4 keV sec. Limits on photino parameters are also given.

• Research Organization: Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510
• OSTI ID: 6642020
• Journal Information: Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Journal Issue: 11 Vol. 38:11; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645102* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
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BEAM DUMPS
BOSONS
CALORIMETERS
CHARGED-PARTICLE REACTIONS
DECAY
ELECTROMAGNETIC RADIATION
ELECTRON REACTIONS
ELEMENTARY PARTICLES
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GEV RANGE 10-100
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MEASURING INSTRUMENTS
NATIONAL ORGANIZATIONS
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NUCLEAR REACTIONS
PARTICLE IDENTIFICATION
PARTICLE PRODUCTION
PARTICLES
PHOTONS
POSTULATED PARTICLES
RADIATIONS
STANFORD LINEAR ACCELERATOR CENTER
SYMMETRY BREAKING
US DOE
US ERDA
US ORGANIZATIONS