Abstract
The binary X-ray star Cyg X3, known to be source of high energy particles which produce air showers, was recently found also to originate underground muons. We propose that both air showers and underground muons are produced by the interaction in the atmosphere of a new kind of neutral, light and long-lived hadron. This hadron could be the lightest of the R-hadrons, composed by a gluino and one or more gluons, with a mass near 1 GeV. We show that this particle could easily justify the muon excess observed in the air showers above 10 15 eV associated with Cyg X3, but still have difficulties to explain the large flux of underground muons. However we believe that the idea of a hadronic nature of the primaries coming from Cyg X3 is promising and merits further experimental investigations.
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