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 Υ(4S) resonance. We measure a mean of 4.70±0.04±0.22 neutral pions per Υ(4S) decay.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
- General Physics and Astronomy
- Nuclear and High Energy Physics
- Mathematical Physics