Abstract
The meson with mass MeV/ and width MeV (full width at half maximum) was measured for the first time in photoproduction from a proton target using CLAS at Jefferson Lab. Differential cross sections were obtained via the , and decay channels from threshold up to a center-of-mass energy of 2.8 GeV. The mass, width, and an amplitude analysis of the final-state Dalitz distribution are consistent with the axial-vector identity, rather than the pseudoscalar . The production mechanism is more consistent with -channel decay of a high-mass state and not with -channel meson exchange. Decays to go dominantly via the intermediate states, with the branching ratio . The branching ratios and were also obtained. The first is in agreement with previous data for the , while the latter is lower than the world average.
9 More- Received 28 April 2016
DOI:https://doi.org/10.1103/PhysRevC.93.065202
©2016 American Physical Society