Observation of eta' Implies mu exp + mu exp - gamma Decay

摘要

The mass spectrum for mu exp + mu exp - gamma systems produced in pi exp - p interactions at 25 and 33 GeV/c has been studied. To detect muon pairs and photons a wide-aperture magnetic spectrometer and a hodoscope gamma -detector were used. In the mass spectrum a clear peak is seen corresponding to the eta' implies mu exp + mu exp - gamma decay previously not observed. The branching for this decay, 8x10 exp -5 , and the muon pair spectrum are in agreement with the eta' formfactor model, based on the vector dominance. (Atomindex citation 11:519978)