In-medium ρ0 spectral function study via the H2,He3,C12(γ,π+π) 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, and H. Yamashita (TAGX Collaboration)
Phys. Rev. C 68, 065202 – Published 17 December 2003

Abstract

We report a helicity analysis of subthreshold ρ0 production on H2, He3, and C12 at low photoproduction energies. The results are indicative of a large longitudinal ρ0 polarization (l=1,m=0) and are consistent with a strong helicity-flip production mechanism. This signature is used to extract in-medium ρL0 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 ρ0 spectral function. The H2 and He3 data distributions support the role of N*(1520) excitation in shaping the in-medium ρL0 invariant mass distribution, while the C12 distributions are consistent with quasi-free ρL0 production. The data support an in-medium modification of the ρL0 invariant mass distribution.

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  • Received 21 July 2003

DOI:https://doi.org/10.1103/PhysRevC.68.065202

©2003 American Physical Society

Authors & Affiliations

G. M. Huber, G. J. Lolos, Z. Papandreou, A. Shinozaki, E. J. Brash, and M. Iurescu

  • Department of Physics, University of Regina, Regina, SK, Canada S4S 0A2

G. Garino and K. Maruyama

  • Institute for Nuclear Study, University of Tokyo, Tanashi, Tokyo 188, Japan

K. Maeda, T. Suda, and A. Toyofuku

  • Department of Physics, Tohoku University, Sendai 980, Japan

B. K. Jennings

  • TRIUMF, Vancouver, British Columbia, Canada V6T 2A3

A. Sasaki

  • College of General Education, Akita University, Akita 010, Japan

H. Yamashita

  • Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184, Japan

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Vol. 68, Iss. 6 — December 2003

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