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.
@article{arxiv.nucl-ex/0103013,
title = {Helicity Signatures in Subthreshold rho Production on Nuclei},
author = {G. J. Lolos and G. M. Huber and A. Shinozaki and Z. Papandreou and E. J. Brash and K. Hossain and M. Iurescu and D. Nordin and G. Garino and K. Maruyama and K. Maeda and T. Suda and A. Toyofuku and A. Sasaki and H. Yamashita},
journal= {arXiv preprint arXiv:nucl-ex/0103013},
year = {2020}
}