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Effects of the hadronic molecule N(2080)3/2− on K*+Λ photoproduction

Wen-Ya Tian1, Neng-Chang Wei2, Yu-Fei Wang1, Fei Huang1,*, and Bing-Song Zou3,4,5,6,†

  • *Contact author: huangfei@ucas.ac.cn
  • †Contact author: zoubs@mail.tsinghua.edu.cn

Phys. Rev. C 112, 055203 – Published 12 November, 2025

DOI: https://doi.org/10.1103/qp7h-tshk

Abstract

In our previous work [Phys. Rev. C 101, 014003 (2020)], we analyzed all available data on differential cross sections and spin density matrix elements for the γp→K*+Λ reaction using an effective Lagrangian approach. There, the t-channel K, K*, and κ exchanges, the u-channel Λ, Σ, and Σ* exchanges, the s-channel N, N(2060)5/2−, and N(2000)5/2+ exchanges, and the interaction current were taken into account in constructing the reaction amplitudes. It was found that, overall, the agreement of the theoretical results with the corresponding data is fairly good. However, noticeable discrepancies between the model results and the data on spin density matrix elements ρ00 are still observed in the center-of-mass energy region around W≈2.08 GeV, indicating the need for additional reaction mechanisms. On the other hand, the hidden-strange pentaquark-like state N(2080)3/2−, which is proposed to be a K*Σ molecular state as the strange partner of the Pc(4457) hadronic molecule, has been found to play quite active roles in reproducing the data for K*+Σ0, K*0Σ+, and ϕp photoproduction reactions. Based on these observations, in the present work, we reanalyze the data for the γp→K*+Λ reaction by incorporating the pentaquark-like state N(2080)3/2− in our previously proposed model. The results show that, with the inclusion of the contributions of N(2080)3/2−, the quality of the theoretical description of the γp→K*+Λ data can be considerably improved. In particular, the data on spin density matrix elements ρ00 and Reρ10 in the near-threshold energy region are significantly better reproduced. This achievement indicates that the hypothesis of the N(2080)3/2− molecular state is compatible with the available data for the γp→K*+Λ reaction. The reaction mechanism of γp→K*+Λ is analyzed and the N(2080)3/2−, N(2060)5/2−, N(2000)5/2+, and K exchanges are found to provide dominant contributions.

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