A search for stable particles heavier than the proton and for Q = −23 quarks produced in e+e− annihilation期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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A search for stable particles heavier than the proton and for Q = −23 quarks produced in e+e− annihilation

Authors:	JM Weiss GS Abrams MS Alam CA Blocker A Blondel AM Boyarski M Breidenbach DL Burke WC Carithers W Chinowsky MW Coles S Cooper WE Dieterle JB Dillon J Dorenbosch JM Dorfan MW Eaton GJ Feldman H Zaccone

Institution:	1. Stanford Linear Accelerator Center, Stanford University, Stanford, CA 94305, USA;2. Lawrence Berkeley Laboratory and Department of Physics, University of California, Berkeley, CA 94720, USA

Abstract:	We have searched 1.4 × 10⁶e⁺e^? annihilation events for particles with 1–3 GeV/c² mass and charge $Q = ? 23$ from the processes e⁺e^?→q $q$ X and e⁺e^? → q $q$ . Upper limits of RQ ～ 10^?4 for each process are presented which improve the previous limits on free quark production in electromagnetic interactions by 2 orders of magnitude.

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