Elsevier

Nuclear Physics B

Volume 89, Issue 1, 14 April 1975, Pages 1-18
Nuclear Physics B

Discovery of the new particle J

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Abstract

We present a description of an experiment carried out at the 30 GeV Alternating Gradient Synchrotron of the Brookhaven National Laboratory. The experiment used a high intensity slow extracted proton beam of between 1010 and 2·1012 protons per pulse and measured the e+e mass spectrum from the reaction p + Be→e+e + X. The results of this experiment shows the production of a new type of particle, J, which decays to e+e with a width consistent with zero.

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Work supported in part by the US Atomic Energy Commission through AEC contract No. AT (11-1)-3069.

Permanent address: Institut de Physique Nucléaire, Orsay, France.

‡‡

Present address: Rutgers University, New Brunswick, NJ 08903.

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Present address: Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510.

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Deutsches Elektronen-Synchrotron, Hamburg, West Germany.

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