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Wu, Jia-Jun; Lee, T-S H.; Zou, Bing-Song
Nucleon resonances with hidden charm in gamma p reactions
Source PublicationPHYSICAL REVIEW C
Language英语
KeywordSHORT-DISTANCE ANALYSIS HEAVY-QUARK SYSTEMS PENTAQUARK STATES PHOTOPRODUCTION SCATTERING MESON DECAY
AbstractThe excitations of nucleon resonances with hidden charm, N-c (c) over bar*, in gamma p reactions are investigated by using the predictions from the available meson-baryon (MB) coupled-channel models of N-c (c) over bar*, with MB = rho N, omega N, J/psi N, (D) over bar Lambda(c), (D) over bar*Lambda(c), (D) over bar Sigma(c), (D) over bar*Sigma(c), (D) over bar Sigma(c)* . For the gamma p -> J/psi p process, we first apply the model of Donnachie and Landshoff to calculate the Pomeron-exchange amplitudes with the parameters determined from fitting the available total cross section data up to invariant mass W = 300 GeV. We then add the resonant gamma p -> N-c (c) over bar* -> J/psi p amplitudes to examine the effects of N-c (c) over bar* excitations on the cross sections of gamma p -> J/psi p in the near threshold energy region covered by the recent experiments at Jefferson Lab. The N-c (c) over bar* -> MB transition matrix elements are determined from the partial decay widths predicted by the considered meson-baryon coupled-channel models of N-c (c) over bar*. The gamma p -> N-c (c) over bar* transition amplitudes are calculated from the vector meson dominance (VMD) model as gamma p -> Vp -> N-c (c) over bar* with V = rho, omega, J/psi. The total gamma p -> J/psi p amplitudes then depend on an off-shell form factor, parametrized as F-V (q(2)) = Lambda(4)(V)/[Lambda(4)(V) + (q(2) - m(V)(2))(2)], which is needed to account for the q(2) dependence of the photon-vector meson coupling constant e m(V)(2)/f(V) of the VMD model. It was found that, with Lambda(V) = 0.55 GeV, the predicted total cross sections are within the range of the data in the energy region near the J/psi production threshold. We then demonstrate that the N-c (c) over bar* can be most easily identified in the differential cross sections at large angles where the contribution from Pomeron exchange becomes negligible. With the same VMD model and the same coupled-channel models of N-c (c) over bar*, we also calculate the resonant amplitudes for the gamma p -> Vp -> N-c (c) over bar* -> (D) over bar (0)Lambda(+)(c)((D) over bar*(0)Lambda(+)(c)) processes. By adding the nonresonant amplitudes due to the exchange of (D) over bar*(0) ((D) over bar (0)), we then predict the cross sections of gamma p -> (D) over bar (0)Lambda(+)(c)((D) over bar*(0)Lambda(+)(c)) for additional experimental tests of the available meson-baryon coupled-channel models of N-c (c) over bar*.
2019
ISSN2469-9985
Volume100Issue:3Pages:35206
Cooperation Status国际
Subject AreaPhysics
MOST Discipline CataloguePhysics, Nuclear
DOI10.1103/PhysRevC.100.035206
Indexed BySCIE
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/27043
CollectionSCI期刊论文
Affiliation1.[Wu, Jia-Jun
2.Univ Chinese Acad Sci, Sch Phys, Beijing 100049, Peoples R China
3.[Lee, T-S H.] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA
4.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China
5.Cent S Univ, Sch Phys & Elect, Changsha 410083, Hunan, Peoples R China
Recommended Citation
GB/T 7714
Wu, Jia-Jun,Lee, T-S H.,Zou, Bing-Song. Nucleon resonances with hidden charm in gamma p reactions[J]. PHYSICAL REVIEW C,2019,100(3):35206.
APA Wu, Jia-Jun,Lee, T-S H.,&Zou, Bing-Song.(2019).Nucleon resonances with hidden charm in gamma p reactions.PHYSICAL REVIEW C,100(3),35206.
MLA Wu, Jia-Jun,et al."Nucleon resonances with hidden charm in gamma p reactions".PHYSICAL REVIEW C 100.3(2019):35206.
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