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Possible mechanism for producing the threshold enhancement in J/psi -> gamma p(p)over-bar
Liu XH(刘晓海); Zhang YJ(张远江); Zhao Q(赵强); Liu, XH; Zhang, YJ; Zhao, Q
2009
发表期刊PHYSICAL REVIEW D
卷号80期号:3页码:34032
通讯作者[Liu, Xiao-Hai ; Zhang, Yuan-Jiang ; Zhao, Qiang] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China ; [Zhao, Qiang] CAS, Theoret Phys Ctr Sci Facil, Beijing 100049, Peoples R China
文章类型Article
摘要In the J/psi radiative decay channels J/psi -> gamma V (V) over bar, the result of partial wave analysis indicates that the V (V) over bar systems are predominately pseudoscalar component, and most of these channels have relatively large branching ratios at an order of 10(-3). Meanwhile, vector mesons, such as rho, omega, and K*, have strong couplings with nucleons and/or hyperons. This suggests a dynamical mechanism describing the eta p (p) over bar form factors for higher eta mesons, such as eta(1405/1475) and eta(1760). It is thus natural to expect that rescatterings of these vector meson pairs into p (p) over bar of 0(-) partial wave could be an important source contributing to J/psi -> gamma p (p) over bar of which the branching ratio is at the order of 10(-4). Our calculation justifies this point. In particular, we find that interferences between different rescattering amplitudes can produce a significant threshold enhancement in the invariant mass spectrum of p (p) over bar. Without introducing dramatic ingredients, our model provides a natural explanation for the peculiar threshold enhancement observed by BES-II in J/psi -> gamma p (p) over bar. Additional experimental constraints on the V (V) over bar -> p (p) over bar transitions are examined. This mechanism in J/psi -> omega p (p) over bar is also discussed.
学科领域Astronomy & Astrophysics; Physics
研究领域[WOS]Astronomy & Astrophysics ; Physics ; Astronomy & Astrophysics ; Physics
DOI10.1103/PhysRevD.80.034032
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语种英语
研究领域[WOS]Astronomy & Astrophysics ; Physics ; Astronomy & Astrophysics ; Physics
WOS类目Astronomy & Astrophysics ; Physics, Particles & Fields
WOS记录号WOS:000269641100054
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被引频次:7[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/240565
专题理论物理室
作者单位中国科学院高能物理研究所
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Liu XH,Zhang YJ,Zhao Q,et al. Possible mechanism for producing the threshold enhancement in J/psi -> gamma p(p)over-bar[J]. PHYSICAL REVIEW D,2009,80(3):34032.
APA 刘晓海,张远江,赵强,Liu, XH,Zhang, YJ,&Zhao, Q.(2009).Possible mechanism for producing the threshold enhancement in J/psi -> gamma p(p)over-bar.PHYSICAL REVIEW D,80(3),34032.
MLA 刘晓海,et al."Possible mechanism for producing the threshold enhancement in J/psi -> gamma p(p)over-bar".PHYSICAL REVIEW D 80.3(2009):34032.
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