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First measurement of coherent ϕ-meson photoproduction from 4He near thresholdстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.
- Авторы: Hiraiwa T., Yosoi M., Niiyama M., Morino Y., Nakatsugawa Y., Sumihama M., Ahn D.S., Ahn J.K., Chang W.C., Chen J.Y., Daté 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.
- Журнал: Physical Review C
- Том: 97
- Номер: 3
- Год издания: 2018
- Издательство: American Physical Society
- Местоположение издательства: College Park, MD
- Первая страница: 035208-1
- Последняя страница: 035208-6
- DOI: 10.1103/physrevc.97.035208
- Аннотация: The differential cross sections and decay angular distributions for coherent ϕ-meson photoproduction from helium-4 are measured for the first time at forward angles with linearly polarized photons in the energy range Eγ=1.685–2.385GeV. Thanks to the target with spin-parity JP=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 (θ=0∘) for the γp→ϕp reaction near threshold, the energy dependence of the forward cross section (θ=0∘) for the γ4He→ϕ4He reaction is analyzed. The comparison to γp→ϕp 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 γp→ϕp reaction near threshold.
- Добавил в систему: Строковский Евгений Афанасьевич