Using the Belle detector operating at the KEKB e+ e- storage ring, we have measured the mean multiplicity and momentum spectrum of neutral pions from the decays of the Y(4S) resonance. We measure a mean of 4.70±0.04±0.22 neutral pions per Y(4S) decay.
Bibliographical notePublisher Copyright:
© 2001 The American Physical Society.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics