Abstract
We use ’s in the 100–200 GeV energy range to produce 147 candidate events of the axial vector pair in the nuclear Coulomb field of a Pb target and determine the radiative widths and . These first measurements appear to be lower than the quark-model predictions. We also place upper limits on the radiative widths for and and find that the latter is vanishingly small in accord with SU(3) invariance in the naive quark model.
- Received 10 October 2001
DOI:https://doi.org/10.1103/PhysRevLett.89.072001
©2002 American Physical Society