Photoproduction of Lambda and Sigma(0) hyperons off protons with linearly polarized photons at E-gamma=1.5-3.0 GeV

doi:10.1103/PhysRevC.97.015208

	Photoproduction of Lambda and Sigma(0) hyperons off protons with linearly polarized photons at E-gamma=1.5-3.0 GeV
	LEPS Collaboration
刊名	PHYSICAL REVIEW C
	2018
卷号	97 期号:1 页码:15208
ISSN号	2469-9985
DOI	10.1103/PhysRevC.97.015208
文献子类	Article
英文摘要	We report the measurement of the gamma p -> K+Lambda and gamma p -> K+Sigma(0) reactions at SPring-8. The differential cross sections and photon-beam asymmetries are measured at forward K+ production angles using linearly polarized tagged-photon beams in the range of E-gamma = 1.5-3.0 GeV. With increasing photon energy, the cross sections for both gamma p -> K+Lambda and gamma p -> K+Sigma(0) reactions decrease slowly. Distinct narrow structures in the production cross section have not been found at E gamma = 1.5-3.0 GeV. The forward peaking in the angular distributions of cross sections, a characteristic feature of t-channel exchange, is observed for the production of Lambda in the whole observed energy range. A lack of similar feature for Sigma(0) production reflects a less dominant role of t-channel contribution in this channel. The photon-beam asymmetries remain positive for both reactions, suggesting the dominance of K* exchange in the t channel. These asymmetries increase gradually with the photon energy, and have a maximum value of +0.6 for both reactions. Comparison with theoretical predictions based on the Regge trajectory in the t channel and the contributions of nucleon resonances indicates the major role of t-channel contributions as well as non-negligible effects of nucleon resonances in accounting for the reaction mechanism of hyperon photoproduction in this photon energy regime.
电子版国际标准刊号	2469-9993
WOS关键词	REACTION GAMMA-P ; BARYON RESONANCES ; CROSS-SECTION ; K+ SIGMA(0) ; ENERGIES ; HYDROGEN ; K+LAMBDA ; NUCLEON ; 16-GEV ; KAON
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000423656700007
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/285578]
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. Photoproduction of Lambda and Sigma(0) hyperons off protons with linearly polarized photons at E-gamma=1.5-3.0 GeV[J]. PHYSICAL REVIEW C,2018,97(1):15208.
APA	LEPS Collaboration.(2018).Photoproduction of Lambda and Sigma(0) hyperons off protons with linearly polarized photons at E-gamma=1.5-3.0 GeV.PHYSICAL REVIEW C,97(1),15208.
MLA	LEPS Collaboration."Photoproduction of Lambda and Sigma(0) hyperons off protons with linearly polarized photons at E-gamma=1.5-3.0 GeV".PHYSICAL REVIEW C 97.1(2018):15208.