Neutral pion photoproduction on the nucleon in a chiral quark model

doi:10.1103/PhysRevC.92.035202

	Neutral pion photoproduction on the nucleon in a chiral quark model
	Xiao, Li-Ye 1,2; Cao, Xu 3; Zhong, Xian-Hui 1,2
刊名	PHYSICAL REVIEW C
	2015-09-08
卷号	92 页码:19
ISSN号	0556-2813
DOI	10.1103/PhysRevC.92.035202
英文摘要	Achiral quark-model approach is adopted to study the gamma p -> pi(0) p and gamma n -> pi(0) n reactions. Good descriptions of the total and differential cross sections and single-polarization observables are obtained from the pion production threshold up to the second resonance region. It is found that (i) the n = 0 shell resonance Delta(1232)P-33, the n = 1 shell resonances N(1535)S-11 and N(1520)D-13, and the n = 2 shell resonance N(1720)P-13 play crucial roles in these two processes. They are responsible for the first, second, and third bump structures in the cross sections, respectively. (ii) Furthermore, obvious evidence of N(1650)S-11 and Delta(1620)S-31 is also found in the reactions. They notably affect the cross sections and the polarization observables from the second resonance region to the third resonance region. (iii) The u-channel background plays a crucial role in the reactions. It has strong interferences with the s-channel resonances. (iv) The t-channel background seems to be needed in the reactions. Including the t-channel vector-meson exchange contribution, the descriptions in the energy region E-gamma = 600-900 MeV are improved significantly. The helicity amplitudes of the main resonances, Delta(1232)P-33, N(1535)S-11, N(1520)D-13, N(1720)P-13, N(1650)S-11, and Delta(1620)S-31, are extracted and compared with the results from other groups.
资助项目	National Natural Science Foundation of China[11075051] ; National Natural Science Foundation of China[11375061] ; National Natural Science Foundation of China[11405222] ; Hunan Provincial Natural Science Foundation[13JJ1018]
WOS关键词	POLARIZED TARGET ASYMMETRY ; RECOIL-PROTON POLARIZATION ; PARTIAL-WAVE ANALYSIS ; BARYON RESONANCES ; PI(0) PHOTOPRODUCTION ; ETA-PHOTOPRODUCTION ; ENERGY REGION ; MESON PHOTOPRODUCTION ; ANGULAR-DEPENDENCE ; PHOTON ENERGIES
WOS研究方向	Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000360885600003
资助机构	National Natural Science Foundation of China ; Hunan Provincial Natural Science Foundation
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/40643]
专题	中国科学院近代物理研究所
通讯作者	Xiao, Li-Ye
作者单位	1.Hunan Normal Univ, Dept Phys, Changsha 410081, Hunan, Peoples R China 2.Minist Educ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Hunan, Peoples R China 3.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Xiao, Li-Ye,Cao, Xu,Zhong, Xian-Hui. Neutral pion photoproduction on the nucleon in a chiral quark model[J]. PHYSICAL REVIEW C,2015,92:19.
APA	Xiao, Li-Ye,Cao, Xu,&Zhong, Xian-Hui.(2015).Neutral pion photoproduction on the nucleon in a chiral quark model.PHYSICAL REVIEW C,92,19.
MLA	Xiao, Li-Ye,et al."Neutral pion photoproduction on the nucleon in a chiral quark model".PHYSICAL REVIEW C 92(2015):19.