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In-Medium rho^0 Spectral Function Study via the 2H, 3He, 12C(gamma,pi+pi-) Reaction

G. M. Huber·G. J. Lolos·Z. Papandreou·A. Shinozaki·E. J. Brash·M. Iurescu·G. Garino·K. Maruyama·K. Maeda·T. Suda·A. Toyofuku·B. K. Jennings·A. Sasaki·H. Yamashita
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Abstract

We report a helicity analysis of sub-threshold rho^0 production on 2H, 3He and 12C at low photo-production energies. The results are indicative of a large longitudinal rho^0 polarization (l=1, m=0) and are consistent with a strong helicity-flip production mechanism. This signature is used to extract in-medium rho^0_L invariant mass distributions for all three nuclei in a manner which is less model-dependent than previous measurements. The results are compared to kinematic and phenomenological models of the rho^0 spectral function. The 2H and 3He data distributions support the role of N*(1520) excitation in shaping the in-medium rho^0_L invariant mass distribution, while the 12C distributions are consistent with quasi-free rho^0_L production. The data support an in-medium modification of the rho^0_L invariant mass distribution.

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G. M. Huber, G. J. Lolos, Z. Papandreou, A. Shinozaki, E. J. Brash, M. Iurescu, G. Garino, K. Maruyama, K. Maeda, T. Suda, A. Toyofuku, B. K. Jennings, A. Sasaki, H. Yamashita. 2003-10-11. In-Medium rho^0 Spectral Function Study via the 2H, 3He, 12C(gamma,pi+pi-) Reaction. https://doi.org/10.1103/physrevc.68.065202

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