Abstract
In this work, we perform a study of nucleon resonance production in the $\gamma p \to p\eta\phi$ reaction within an effective Lagrangian approach. In our model, we consider the excitation of the $N^*(1535)$, $N^*(1650)$, $N^*(1710)$ and $N^*(1720)$ in the intermediate state and the background term. We find that this reaction is dominated by the excitation of the $N^*(1535)$ in the near threshold region. Especially, we study the possible role of the scalar meson exchange in this reaction. It is found that the $f_0(980)$ exchange may give a significant contribution and the parity asymmetry can be used to identify its role in this reaction.
Highlights
To study the properties of nucleon resonance is a central task in hadronic physics
We investigate the γp → pηφ reaction within an effective Lagrangian approach
We consider the contribution of the N ∗(1535), N ∗(1650), N ∗(1710), and N ∗(1720) in the intermediate state and the background contribution
Summary
To study the properties of nucleon resonance is a central task in hadronic physics. Despite decades of studies of the nucleon resonances, there are still some controversies involving the nature and structure of some nucleon resonances. By inspecting the production mechanisms of nucleon resonance in multimeson production processes, it is possible to learn about their couplings with various channels [9,10] These studies are helpful for us to better understand the nature and properties of the N ∗s. The resonance contribution in the φη and φp channels is ignored in this work, because in the energy region under study no significant resonance signals are found in these two channels [11] According to this assumption, it seems that the present reaction may be a good place to study the excitation mechanisms of the nucleon resonances in the γp → φN ∗ process since the decay process of N ∗ → ηN is relatively well known. As for the a0(980) and a1(1235), we choose to ignore their contributions at present partially because their couplings to
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