Abstract
We have observed the decay of the in the production reaction at 20 GeV. Using a calculation which takes into account the interference of the with the and a Drell background, we find good evidence that this resonance is a radial excitation of the . The background interference strongly distorts the angular distributions predicted by a purely -channel helicity-conserving production mechanism. We measure GeV/ and GeV/.
- Received 25 May 1984
DOI:https://doi.org/10.1103/PhysRevLett.53.751
©1984 American Physical Society