Helicity Signatures in Subthreshold rho Production on Nuclei
arXiv:nucl-ex/0103013 · doi:10.1016/S0370-2693(02)01194-2
Abstract
We report a helicity analysis of subthreshold rho production on 2H and 12C nuclei at low photoproduction energies and large |t|. The results are indicative of a large longitudinal rho polarization (l=1, m=0) and are consistent with a strong helicity-flip mechanism of rho production. The analysis is model-independent and supports the large mass shift reported from the earlier 3He experiments.
9 pages, 4 figures