Knowledge Management System of Institute of Theoretical Physics, CAS
Wu, Jia-Jun; Lee, T-S H.; Zou, Bing-Song
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| Nucleon resonances with hidden charm in gamma p reactions | |
| Source Publication | PHYSICAL REVIEW C
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| Language | 英语 |
| Keyword | SHORT-DISTANCE ANALYSIS HEAVY-QUARK SYSTEMS PENTAQUARK STATES PHOTOPRODUCTION SCATTERING MESON DECAY |
| Abstract | The 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 | |
| ISSN | 2469-9985 |
| Volume | 100Issue:3Pages:35206 |
| Cooperation Status | 国际 |
| Subject Area | Physics |
| MOST Discipline Catalogue | Physics, Nuclear |
| DOI | 10.1103/PhysRevC.100.035206 |
| Indexed By | SCIE |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.itp.ac.cn/handle/311006/27043 |
| Collection | SCI期刊论文 |
| Affiliation | 1.[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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