Possibility to study the pentaquark states P-c(4312), P-c(4440), and P-c(4457) in the reaction gamma p -> J/psi p

doi:10.1103/PhysRevD.99.114007

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	Possibility to study the pentaquark states P-c(4312), P-c(4440), and P-c(4457) in the reaction gamma p -> J/psi p
	Wang, Xiao-Yun 1; Chen, Xu-Rong 2; He, Jun 3,4
刊名	PHYSICAL REVIEW D
	2019-06-11
卷号	99 期号:11
ISSN号	2470-0010
DOI	10.1103/PhysRevD.99.114007
英文摘要	Inspired by the observation of the pentaquark states P-c(4312), P-c(1440), and P-c(4457) at LHCb, photoproduction of these three P-c states via the interaction gamma p -> J/psi p is investigated in an effective Lagrangian approach. The t-channel Pomeron exchange diffractive process is considered as the main background for the J/psi, photoproduction. The numerical results show that the theoretical cross section, which is calculated by assuming a branching ratio Br[P-c -> J/psi p] similar or equal to 3%, is consistent with the existing experimental data of the gamma p -> J/psi p process. With such a branching ratio, if experimental precision reaches 0.1 nb within a bin of 100 MeV for photon energy, two peaks arc expected to be obviously observed in the J/psi p photoproduction. To observe the two-peak structure from P-c(4440) and P-c(4457), higher precision, about 0.1 nb/10 MeV, is required to distinguish two close pentaquarks. If the physical branching ratio is larger, the requirement of experimental precision will be reduced. The differential cross sections for reaction gamma p -> J/psi p are also present. It is found that the t-channel Pomeron exchange provides a sharp increase at extreme forward angles and gives a sizable contribution at most energy points, while the contributions from the s-channel P-c exchanges play important roles at threshold energies. The experimental measurement of the gamma p -> J/psi p process in the near-threshold energy region around E-gamma similar or equal to 9.4-10.5 GeV is suggested and is accessible at CEBAF@JLab and COMPASS.
资助项目	Natural Science Foundation of Gansu province[17JR5RA113]
WOS研究方向	Astronomy & Astrophysics ; Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000471984900003
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/31804]
专题	理学院外国语学院
通讯作者	Wang, Xiao-Yun; Chen, Xu-Rong; He, Jun
作者单位	1.Lanzhou Univ Technol, Dept Phys, Lanzhou 730050, Gansu, Peoples R China 2.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China 3.Nanjing Normal Univ, Dept Phys, Nanjing 210097, Jiangsu, Peoples R China 4.Nanjing Normal Univ, Inst Theoret Phys, Nanjing 210097, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Wang, Xiao-Yun,Chen, Xu-Rong,He, Jun. Possibility to study the pentaquark states P-c(4312), P-c(4440), and P-c(4457) in the reaction gamma p -> J/psi p[J]. PHYSICAL REVIEW D,2019,99(11).
APA	Wang, Xiao-Yun,Chen, Xu-Rong,&He, Jun.(2019).Possibility to study the pentaquark states P-c(4312), P-c(4440), and P-c(4457) in the reaction gamma p -> J/psi p.PHYSICAL REVIEW D,99(11).
MLA	Wang, Xiao-Yun,et al."Possibility to study the pentaquark states P-c(4312), P-c(4440), and P-c(4457) in the reaction gamma p -> J/psi p".PHYSICAL REVIEW D 99.11(2019).