Photoproduction $\ensuremath{\gamma}p\ensuremath{\rightarrow}{K}^{*+}\mathrm{\ensuremath{\Lambda}}$ in a Reggeized model

Photoproduction $γ p \to K^{* +} Λ$ in a Reggeized model

Ai-Chao Wang, Fei Huang, Wen-Ling Wang, and Guang-Xiong Peng

Phys. Rev. C 102, 015203 – Published 8 July 2020

Abstract

The high-precision differential cross-section data for the reaction $γ p \to K^{* +} Λ$ are reanalyzed within a Regge-inspired effective Lagrangian approach. The model adopts Regge phenomenology to constrain the $t$ -channel contributions from the $κ$ , $K$ , and $K^{*}$ exchanges. A minimal number of resonances in the $s$ channel are introduced in constructing the reaction amplitudes in order to describe the data. It is shown that the differential cross-section data for $γ p \to K^{* +} Λ$ can be satisfactorily described by introducing the only $N (2060) {5 / 2}^{-}$ resonance in the $s$ channel, which is quite different from our earlier work performed in an effective Lagrangian approach [A. C. Wang et al., Phys. Rev. C 96, 035206 (2017)], where the amplitudes are computed by evaluating Feynman diagrams and it is found that introducing at least one additional resonance apart from the $N (2060) {5 / 2}^{-}$ is indispensable for reproducing the data. The roles of individual contributions from meson and baryon exchanges on the angular distributions are found to be highly model dependent. The extracted mass of $N (2060) {5 / 2}^{-}$ turns out to be well determined, independent of how the $t$ -channel amplitudes are constructed, whereas the width does not.

Received 15 February 2019
Revised 15 August 2019
Accepted 24 June 2020

DOI:https://doi.org/10.1103/PhysRevC.102.015203

Physics Subject Headings (PhySH)

Particle interactions Particle production Photonuclear reactions Strong interaction

Baryons

Nuclear PhysicsParticles & Fields

Authors & Affiliations

Ai-Chao Wang¹, Fei Huang ^1,*, Wen-Ling Wang², and Guang-Xiong Peng¹

¹School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
²School of Physics, Beihang University, Beijing 100191, China

^*Corresponding author: huangfei@ucas.ac.cn

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Vol. 102, Iss. 1 — July 2020

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Figure 1
Generic structure of the amplitude for $γ N \to K^{*} Λ$ . Time proceeds from left to right.
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Figure 2
Differential cross sections for $γ p \to K^{* +} Λ$ as a function of $cos θ$ in the center-of-mass frame in the near-threshold region. The black solid lines and the blue dashed lines correspond to the results fitted with the $N (2100) 1 / 2^{+}$ resonance and the results fitted with the $N (2060) 5 / 2^{-}$ resonance in model II (the interpolated Regge model), respectively. The scattered symbols denote the CLAS data from Ref. [3]. The numbers in parentheses denote the photon laboratory incident energy (left number) and the total center-of-mass energy of the system (right number), in MeV.
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Figure 3
Differential cross sections for $γ p \to K^{* +} Λ$ as a function of $cos θ$ (black solid lines) from model I (Regge model). The scattered symbols denote the CLAS data from Ref. [3]. The blue dashed and green dash-dotted lines represent the individual contributions from the $K$ and $N (2060) 5 / 2^{-}$ exchanges, respectively. The numbers in parentheses denote the photon laboratory incident energy (left number) and the corresponding total center-of-mass energy of the system (right number), in MeV.
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Figure 4
Differential cross sections for $γ p \to K^{* +} Λ$ as a function of $cos θ$ (black solid lines) from model II (interpolated Regge model). In addition to the same notations as in Fig. 3, the red dash-double-dotted and cyan dotted lines represent the contributions from the $K^{*}$ exchange and the interaction current, respectively.
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Figure 5
Total cross sections with individual contributions for $γ p \to K^{* +} Λ$ . The left graph is for model I (Regge model), the middle one corresponds to model II (interpolated Regge model), and the right one is for model I of Ref. [10] (Feynman model). The black solid lines represent the full results. The green dash-dotted, blue dashed, red dash-double-dotted, and cyan dotted lines represent the individual contributions from the $N (2060) 5 / 2^{-}$ , $K$ , $K^{*}$ exchanges and the interaction current, respectively. The olive short-dash-dotted lines represent the contributions from the Born term which consists of the coherent sum of all the contributions other than the $s$ -channel resonance exchanges. In the right graph, the purple double-dash-dotted line represents the contributions from the $N (2000) 5 / 2^{+}$ exchange. The contributions from the $K^{*}$ exchange and the interaction current in the left and right graphs are not presented, and so are the contributions from other terms in these three graphs, since these contributions are too small to be clearly seen with the scale used in this figure. The scattered symbols are data from CLAS Collaboration [3].
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Physical Review C

covering nuclear physics

Photoproduction $γ p \to K^{* +} Λ$ in a Reggeized model

Ai-Chao Wang, Fei Huang, Wen-Ling Wang, and Guang-Xiong Peng

Phys. Rev. C 102, 015203 – Published 8 July 2020

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Physical Review C

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Photoproduction γp→K*+Λ in a Reggeized model

Ai-Chao Wang, Fei Huang, Wen-Ling Wang, and Guang-Xiong Peng

Phys. Rev. C 102, 015203 – Published 8 July 2020

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Photoproduction $γ p \to K^{* +} Λ$ in a Reggeized model