Abstract
We study the reaction mechanism of \(\phi \)-meson photoproduction on the nucleon and \({}^4\)He targets by using a dynamical model based on a Hamiltonian. In addition to the dominant contribution of the Pomeron exchange, various meson exchanges are considered in the t channel to describe the CLAS data in the low energy region \({\sqrt{s}} = (1.97 - 2.84)\) GeV. The direct \(\phi \) radiations are taken into account in the s- and u-channels. The backward structures at \({\sqrt{s}} \approx 2.1\) and 2.3 GeV are well reproduced by the inclusion of the s-channel \(N(2000,5/2^+)\) and \(N(2300,1/2^+)\) resonances, respectively. We also consider the final \(\phi N\) interactions by the gluon exchange, the direct \(\phi N\) interactions, and the box diagrams arising from the couplings with the \(\pi N\), \(\rho N\), \(K \Lambda \), and \(K \Sigma \) channels. The effects of the final state interactions are found to be very weak. Then the resulting Hamiltonian is used to study the coherent \(\gamma {}^4{\textrm{He}} \rightarrow \phi {}^4{\textrm{He}}\) reaction within the distorted-weave impulse approximation. The calculated differential cross sections account for the LEPS data quite well.
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Data set presented in the manuscript is just a probe of obtained results and is available from the corresponding author on reasonable request.
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Acknowledgements
The work of S.-H.K was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) under Grants No. 2021R1A6A1A03043957 and No. 2022R1I1A1A01054390. T.-S.H.L was supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract DE-AC02-06CH11357. The work of S.i.N was supported by the NRF under Grants Nos. 2018R1A5A1025563, 2022R1A2C1003964, and 2022K2A9A1A0609176.
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Kim, SH., Lee, TS.H., Nam, Si. et al. \(\phi \) Meson Photoproduction on the Nucleon and \({}^4\)He Targets. Few-Body Syst 65, 19 (2024). https://doi.org/10.1007/s00601-024-01894-5
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DOI: https://doi.org/10.1007/s00601-024-01894-5