Nucleon resonances in $\gamma p\to K^{\ast +}\Lambda$

Abstract

The high-precision cross-section data for the reaction $\gamma p\to K^{\ast +}\Lambda$ reported by the CLAS Collaboration at the Thomas Jefferson National Accelerator Facility have been analyzed based on an effective Lagrangian approach in the tree-level approximation. Apart from the $t$-channel $K$, $\kappa$, $K^{\ast }$ exchanges, the $s$-channel nucleon ($N$) exchange, the $u$-channel $\Lambda$, $\Sigma$, ${\Sigma }^{\ast }(1385)$ exchanges, and the generalized contact term, the contributions from the near-threshold nucleon resonances in the $s$-channel are also taken into account in constructing the reaction amplitude. It is found that, to achieve a satisfactory description of the differential cross section data, at least two nucleon resonances should be included. By including the $N(2060){5/2}^{-}$ resonance, which is responsible for the shape of the angular distribution near the $K^{\ast }\Lambda$ threshold, and one of the $N(2000){5/2}^{+}$, $N(2040){3/2}^{+}$, $N(2100){1/2}^{+}$, $N(2120){3/2}^{-}$ and $N(2190){7/2}^{-}$ resonances, one can describe the cross-section data quite well, with the fitted resonance masses and widths compatible with those advocated by the Particle Data Group. The resulted predictions of the beam, target, and recoil asymmetries are found to be quite different from various fits, indicating the necessity of the spin observable data for $\gamma p\to K^{\ast +}\Lambda$ to further pin down the resonance contents and associated parameters in this reaction.

19 pages, 14 figures

References in corpus (10)

• The Flavor Structure of the Excited Baryon Spectra from Lattice QCD
• Gauge-invariant approach to meson photoproduction including the final-state interaction
• Coupled-Channel Model for $\bar{K}N$ Scattering in the Resonant Region
• K* photoproduction off the nucleon: gamma N --> K* Lambda
• Scalar kappa meson in K* photoproduction
• Photoproduction of Xi off nucleons
• $\bar{K}+N\to K+\Xi$ reaction and $S=-1$ hyperon resonances
• Role of high-spin hyperon resonances in the reaction of $\gamma p\to K^{+}{K}^{+}{\Xi }^{-}$
• The $K^{\ast 0}\Lambda$ photoproduction off a neutron
• Regge approach to the reaction of $\gamma N\to K^{\ast }\Lambda$

Cited by in corpus (20)

• Light Baryon Spectroscopy
• Effects of $\Delta (1905)5/2^{+}$ on $K^{\ast }\Sigma$ photoproduction
• Towards the Minimal Spectrum of Excited Baryons
• Nucleon resonances in $\gamma p\to \omega p$ reaction
• Nucleon and $\Delta$ resonances in $\gamma p\to K^{+}{\Sigma }^0(1385)$ photoproduction
• Radiative decays of $f_1(1285)$ as the $K^{\ast }\bar{K}$ molecular state
• Photoproduction $\gamma p\to K^{+}\Lambda (1520)$ in an effective Lagrangian approach
• Effects of $N(2000){5/2}^{+}$ on $\gamma p\to K^{+}\Lambda (1405)$
• Analysis of the data on spin density matrix elements for $\gamma p\to K^{\ast +}\Lambda$
• Photoproduction $\gamma p\to K^{\ast +}\Lambda$ in a Reggeized model
• Analysis of the differential cross section and photon beam asymmetry data for $\gamma p\to {\eta }^{\prime }p$
• Gauge invariance of meson photo- and electroproduction currents revisited
• Combined analysis of the $\gamma n\to K^0{\Sigma }^0$ and $\gamma n\to K^{+}{\Sigma }^{-}$ reactions
• Analysis of the data for $\gamma p\to f_1(1285)p$ photoproduction
• Towers of baryons of the $\mathcal{N}=2$ quark model band in the large $N_c$ limit
• Studies on photo- and electro-productions of $\Lambda (1405)$ via ${\gamma }^{(\ast )}p\to K^{\ast +}{\pi }^0{\Sigma }^0$
• First Measurements of the Double-Polarization Observables $F$, $P$, and $H$ in $\omega$ Photoproduction off Transversely Polarized Protons in the $N^{\ast }$ Resonance Region
• Photoproduction $\gamma p\to K^{+}\Lambda (1690)$ in an effective Lagrangian approach
• Combined analysis of the data on cross sections and spin density matrix elements for $K^{\ast }\Sigma$ photoproduction reactions
• Role of the $\Lambda (1600)$ in the $K^{-}p\to \Lambda {\pi }^0{\pi }^0$ reaction