Search for Neutral Metastable Penetrating Particles Produced in the SLAC Beam Dump
作者： J. D. Bjorken , S. Ecklund , W. R. Nelson , A. Abashian , C. Church
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摘要: A search was made for neutral objects which might be produced by 20-GeV electrons incident on the SLAC beam dump, penetrate downstream natural shielding, and decay upstream of an electromagnetic shower calorimeter. With about 30 C dumped, no candidate events were found above energy \ensuremath{\sim}2 GeV. The 95%-confidence-level limit product mass lifetime light axionlike bosons decaying primarily into two photons is determined to greater than 1.4 keV sec. Limits photino parameters are also given.
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