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VOLUME 40 (1984) | ISSUE 10 | PAGE 440
Search for light particles with a charge of 2/3 in e+e- annihilation
An upper limit has been found on the cross section for the production of particles with a charge of 2/3 and a mass up to 0.4 GeV in the reaction e^e~^qq from measurements by the OLYa detector on the VEPP-2M storage ring: aqq/ σμμ < Ю-4. This limit is two orders of magnitude lower than the results of previous experiments sensitive to quarks of small mass.