A coupled-channel analysis for phi-photoproduction with Lambda(1520)

Abstract

We investigate photoproduction of $\varphi$-mesons off protons within a coupled-channel effective-Lagrangian method which is based on the K-matrix approach. Since the threshold energy of the $K\Lambda (1520)$ channel is close to that of $\varphi N$, the contribution of this channel to $\varphi$-photoproduction near the threshold energy region may give rise to some unexpected structures. In the transition amplitude $K\Lambda (1520)\to \varphi N$, the kinematics allows an intermediate kaon to be on-shell. This happens in the energy region where a peak structure has been observed in $\varphi$-photoproduction. In our calculations the on-shell kaon effect indeed reproduces a peak structure, however, with a magnitude that is far too small to explain the observed effect. As a following step we introduce a nucleon resonance in our model. The coupling of the resonance to the $K\Lambda (1520)$ and $\varphi N$ channels is not suppressed by the OZI rule if the resonance contains a dominant hidden strangeness component. We find that the resonance can reproduce a peak structure of the correct magnitude at the right energy. We also investigate the effects of coupled channels and the resonance on the angular distribution and the spin density matrices for $\varphi$ photoproduction.

28 pages, 21 figures

References in corpus (11)

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Cited by in corpus (20)

• Data analysis techniques, differential cross sections, and spin density matrix elements for the reaction $\gamma p\to \varphi p$
• Vector meson-Baryon dynamics and generation of resonances
• Near-threshold Lambda(1520) production by the gamma p -> K+Lambda(1520) reaction at forward K+ angles
• The role of the $N^{\ast }(2080)$ resonance in the $\vec{\gamma }p\to K^{+}\Lambda (1520)$ reaction
• Is the nonmonotonic behavior in the cross section of phi photoproduction near threshold a signature of a resonance?
• Measurement of Spin-Density Matrix Elements for $\varphi$-Meson Photoproduction from Protons and Deuterons Near Threshold
• Decay behavior of the strange and beauty partners of $P_c$ hadronic molecules
• Charged K* Photoproduction in a Regge model
• On the near-threshold peak structure in the differential cross section of ϕ-meson photoproduction: indication of a missing resonance with non-negligible strangeness content
• Interference effect between $\varphi$ and $\Lambda (1520)$ production channels in the $\gamma p\to K^{+}{K}^{-}p$ reaction near threshold
• $\varphi$ photoproduction on the proton at $E_{\gamma }$ = 1.5 - 2.9 GeV
• First measurement of coherent $\varphi$-meson photoproduction from helium-4 near threshold
• Searching for the odderon in $pp\to pp{K}^{+}{K}^{-}$ and $pp\to pp{\mu }^{+}{\mu }^{-}$ reactions in the $\varphi (1020)$ resonance region at the LHC
• A study of the $KN$-$K^{\ast }N$ coupled systems
• Role of $\sigma$ exchange in the $\gamma p\to \varphi p$ process and scaling with the $f_1$ axial vector meson from a Reggeized model
• Pomeron, nucleon-resonance, and $(0^{+},0^{-},1^{+})$-meson contributions in $\varphi$-meson photoproduction
• Electroproduction of $\Lambda (1520)$ off the nucleon target with the nucleon resonances
• Decay patterns of low-lying $N_{s\bar{s}}$ states to the strangeness channels
• Analysis of the interaction between $\varphi$ meson and nucleus
• Vector- and Pseudoscalar-baryon coupled channel systems