A REINTERPRETATION OF THE EXOTIC EVENT OBSERVED IN THE COSMIC-RAY AT YUNNAN COSMIC-RAY STATION

The exotic event observed in 1972 at Yunan Cosmic Ray Station (YCRS) h as been re-interpreted as a collision between a high energy heavy part icle with a nucleon, with three charged particles identified as the fi nal products. If no other missing neutral particles were produced in t his collision, then one of the three particles C+ could be assigned wi th mass M(c)(+) > 43 GeV, and life-time tau > 0.406 x 10(-9) s. If Cis instable, it can decay via weak interaction to C degrees and a pair of leptons. The mass difference between C+ and C degrees is estimated as less than 0.270 GeV. The relevance of this event to the dark matte r problem in the Universe is also discussed.