First measurement of coherent phi-meson photoproduction from He-4 near threshold
- Authors
- Hiraiwa, T.; Yosoi, M.; Niiyama, M.; Morino, Y.; Nakatsugawa, Y.; Sumihama, M.; Ahn, D. S.; Ahn, J. K.; Chang, W. C.; Chen, J. Y.; Date, S.; Fujimura, H.; Fukui, S.; Hicks, K.; Hotta, T.; Hwang, S. H.; Ishikawa, T.; Kato, Y.; Kawai, H.; Kohri, H.; Kon, Y.; Lin, P. J.; Maeda, Y.; Miyabe, M.; Mizutani, K.; Muramatsu, N.; Nakano, T.; Nozawa, Y.; Ohashi, Y.; Ohta, T.; Oka, M.; Rangacharyulu, C.; Ryu, S. Y.; Saito, T.; Sawada, T.; Shimizu, H.; Strokovsky, E. A.; Sugaya, Y.; Suzuki, K.; Tokiyasu, A. O.; Tomioka, T.; Tsunemi, T.; Uchida, M.; Yorita, T.
- Issue Date
- 27-3월-2018
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW C, v.97, no.3
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW C
- Volume
- 97
- Number
- 3
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/76686
- DOI
- 10.1103/PhysRevC.97.035208
- ISSN
- 2469-9985
- Abstract
- The differential cross sections and decay angular distributions for coherent phi-meson photoproduction from helium-4 are measured for the first time at forward angles with linearly polarized photons in the energy range E-gamma = 1.685-2.385 GeV. Thanks to the target with spin-parity J(P) = 0(+), unnatural-parity exchanges are absent, and thus natural-parity exchanges can be investigated clearly. The decay asymmetry with respect to photon polarization is shown to be very close to the maximal value. This ensures the strong dominance (> 94%) of natural-parity exchanges in this reaction. To evaluate the contribution from natural-parity exchanges to the forward cross section (theta = 0 degrees) for the gamma p -> phi p reaction near threshold, the energy dependence of the forward cross section (theta = 0 degrees) for the gamma He-4 -> phi He-4 reaction is analyzed. The comparison to gamma p ->phi p data suggests that enhancement of the forward cross section arising from natural-parity exchanges and/or destructive interference between natural-parity and unnatural-parity exchanges is needed in the gamma p ->phi p reaction near threshold.
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