First measurement of coherent phi-meson photoproduction from He-4 near threshold

doi:10.1103/PhysRevC.97.035208

	First measurement of coherent phi-meson photoproduction from He-4 near threshold
	LEPS Collaboration
刊名	PHYSICAL REVIEW C
	2018
卷号	97 期号:3 页码:35208
ISSN号	2469-9985
DOI	10.1103/PhysRevC.97.035208
文献子类	Article
英文摘要	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.
电子版国际标准刊号	2469-9993
WOS关键词	SCATTERING ; POMERON ; PHOTON ; SLOPE
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000428389300004
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/285791]
专题	高能物理研究所_实验物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	LEPS Collaboration. First measurement of coherent phi-meson photoproduction from He-4 near threshold[J]. PHYSICAL REVIEW C,2018,97(3):35208.
APA	LEPS Collaboration.(2018).First measurement of coherent phi-meson photoproduction from He-4 near threshold.PHYSICAL REVIEW C,97(3),35208.
MLA	LEPS Collaboration."First measurement of coherent phi-meson photoproduction from He-4 near threshold".PHYSICAL REVIEW C 97.3(2018):35208.