Differential cross section and photon-beam asymmetry for the (gamma)over-right-arrow p -> pi(+) n reaction at forward pi(+) angles at E-gamma=1.5-2.95 GeV

doi:10.1103/PhysRevC.97.015205

	Differential cross section and photon-beam asymmetry for the (gamma)over-right-arrow p -> pi(+) n reaction at forward pi(+) angles at E-gamma=1.5-2.95 GeV
	LEPS Collaboration
刊名	PHYSICAL REVIEW C
	2018
卷号	97 期号:1 页码:15205
ISSN号	2469-9985
DOI	10.1103/PhysRevC.97.015205
文献子类	Article
英文摘要	Differential cross sections and photon-beam asymmetries for the (gamma) over right arrowp -> pi(+) n reaction have been measured for 0.6 < cos theta(pi) < 1 and E-gamma = 1.5-2.95 GeV at SPring-8/LEPS. The cross sections monotonically decrease as the photon beam energy increases for 0.6 < cos theta(pi) < 0.9. However, the energy dependence of the cross sections for 0.9 < cos theta(pi) < 1 and E-gamma = 1.5-2.2 GeV (W = 1.9-2.2 GeV) is different, which may be due to a nucleon or Delta resonance. The present cross sections agree well with the previous cross sections measured by other groups and show forward peaking, suggesting significant t-channel contributions in this kinematical region. The asymmetries are found to be positive, which can be explained by rho exchange in the t channel. Large positive asymmetries in the small-vertical bar t vertical bar region, where the rho-exchange contribution becomes small, could be explained by introducing p-exchange interference with the s channel.
电子版国际标准刊号	2469-9993
WOS关键词	LINEARLY POLARIZED PHOTONS ; CHARGED-PION-PHOTOPRODUCTION ; MESON PHOTOPRODUCTION ; PI+ PHOTOPRODUCTION ; NEAR-THRESHOLD ; HYDROGEN ; ENERGIES ; SPRING-8
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000423230200009
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/285551]
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. Differential cross section and photon-beam asymmetry for the (gamma)over-right-arrow p -> pi(+) n reaction at forward pi(+) angles at E-gamma=1.5-2.95 GeV[J]. PHYSICAL REVIEW C,2018,97(1):15205.
APA	LEPS Collaboration.(2018).Differential cross section and photon-beam asymmetry for the (gamma)over-right-arrow p -> pi(+) n reaction at forward pi(+) angles at E-gamma=1.5-2.95 GeV.PHYSICAL REVIEW C,97(1),15205.
MLA	LEPS Collaboration."Differential cross section and photon-beam asymmetry for the (gamma)over-right-arrow p -> pi(+) n reaction at forward pi(+) angles at E-gamma=1.5-2.95 GeV".PHYSICAL REVIEW C 97.1(2018):15205.