Precise Determination of ρ-ω Interference Parameters from Photoproduction of Vector Mesons Off Nucleon and Nuclei
Abstract
We have studied ρ-ω interference in di-pion photoproduction in the energy range 5-7 GeV with a total of 630 000 pion pairs from hydrogen, carbon, and lead. The mass spectra show clear interference in the vicinity of the ω mass. A branching ratio Γω-->2πΓω-->all=(1.22+/-0.30)% and a relative phase to the ρ-->ππ amplitude of 96°+/-15° is found, where the errors include model-dependent uncertainties and are twice the size of the statistical errors alone.
- Publication:
-
Physical Review Letters
- Pub Date:
- September 1971
- DOI:
- 10.1103/PhysRevLett.27.888
- Bibcode:
- 1971PhRvL..27..888A