Polarization Transfer in Wide-Angle Compton Scattering and Single-Pion Photoproduction from the Proton

doi:10.1103/PhysRevLett.115.152001

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	Polarization Transfer in Wide-Angle Compton Scattering and Single-Pion Photoproduction from the Proton
	Fanelli, C; Cisbani, E; Hamilton, DJ; Salme, G; Wojtsekhowski, B; Ahmidouch, A; Annand, JRM; Baghdasaryan, H; Beaufait, J; Bosted, P
刊名	PHYSICAL REVIEW LETTERS
	2015-10-06
卷号	115 期号:15
ISSN号	0031-9007
DOI	10.1103/PhysRevLett.115.152001
文献子类	Article
英文摘要	Wide-angle exclusive Compton scattering and single-pion photoproduction from the proton have been investigated via measurement of the polarization transfer from a circularly polarized photon beam to the recoil proton. The wide-angle Compton scattering polarization transfer was analyzed at an incident photon energy of 3.7 GeV at a proton scattering angle of theta(p)(cm) cm = 70 degrees. The longitudinal transfer K-LL, measured to be 0.645 +/- 0.059 +/- 0.048, where the first error is statistical and the second is systematic, has the same sign as predicted for the reaction mechanism in which the photon interacts with a single quark carrying the spin of the proton. However, the observed value is similar to 3 times larger than predicted by the generalized-parton-distribution-based calculations, which indicates a significant unknown contribution to the scattering amplitude.
学科主题	Physics
出版地	COLLEGE PK
资助项目	美国国家科学基金项目 ; 美国能源部项目
项目编号	INFN gruppo Sanita ; National Science Foundation ; UK Science and Technology Facilities Council [STFC 57071/1, 50727/1] ; DOE [DE-AC05-84ER40150, M175]
语种	英语
WOS记录号	WOS:000362337200003
资助机构	US NSF ; US DOE
内容类型	期刊论文
源URL	[http://ir.lzu.edu.cn/handle/262010/178456]
专题	学院待认领_期刊论文
通讯作者	Wojtsekhowski, B (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA.
推荐引用方式 GB/T 7714	Fanelli, C,Cisbani, E,Hamilton, DJ,et al. Polarization Transfer in Wide-Angle Compton Scattering and Single-Pion Photoproduction from the Proton[J]. PHYSICAL REVIEW LETTERS,2015,115(15).
APA	Fanelli, C.,Cisbani, E.,Hamilton, DJ.,Salme, G.,Wojtsekhowski, B.,...&Wojtsekhowski, B .(2015).Polarization Transfer in Wide-Angle Compton Scattering and Single-Pion Photoproduction from the Proton.PHYSICAL REVIEW LETTERS,115(15).
MLA	Fanelli, C,et al."Polarization Transfer in Wide-Angle Compton Scattering and Single-Pion Photoproduction from the Proton".PHYSICAL REVIEW LETTERS 115.15(2015).