The role of vector-baryon channels and resonances in the $\gamma p\to K^0{\Sigma }^{+}$ and $\gamma n\to K^0{\Sigma }^0$ reactions near the $K^{\ast }\Lambda$ threshold

Abstract

We have studied the $\gamma p\to K^0{\Sigma }^{+}$ reaction in the energy region around the $K^{\ast }\Lambda$ and $K^{\ast }\Sigma$ thresholds, where the CBELSA/TAPS cross section shows a sudden drop and the differential cross section experiences a transition from a forward-peaked distribution to a flat one. Our coupled channel model incorporates the dynamics of the vector meson-baryon interaction which is obtained from the hidden gauge formalism. We find that the cross section in this energy region results from a delicate interference between amplitudes having $K^{\ast }\Lambda$ and $K^{\ast }\Sigma$ intermediate states. The sharp downfall is dictated by the presence of a nearby $N^{\ast }$ resonance produced by our model, a feature that we have employed to predict its properties. We also show results for the complementary $\gamma n\to K^0{\Sigma }^0$ reaction, the measurement of which would test the mechanism proposed in this work.

12 pages, 5 figures, version to appear in Phys. Lett. B

References in corpus (7)

• The ρρinteraction in the hidden gauge formalism and the f_0(1370) and f_2(1270) resonances
• Hidden gauge formalism for the radiative decays of axial-vector mesons
• Measurement of the reaction gamma p --> K0 Sigma+ at photon energies up to 2.6 GeV
• Interaction of vector mesons with baryons and nuclei
• Nucleon resonance decay by the $K^0{\Sigma }^{+}$ channel
• The role of the $N^{\ast }(2080)$ resonance in the $\vec{\gamma }p\to K^{+}\Lambda (1520)$ reaction
• A case in favor of the $N^{\ast }(1700)(3/2^{-})$

Cited by in corpus (23)

• Role of a triangle singularity in the $\gamma p\to K^{+}\Lambda (1405)$ reaction
• Light baryon resonances from a coupled-channel study including $\mathbf{K\Sigma }$ photoproduction
• $\bar{K}+N\to K+\Xi$ reaction and $S=-1$ hyperon resonances
• Triangular singularity and a possible $\varphi p$ resonance in the ${\Lambda }_c^{+}\to {\pi }^0\varphi p$ decay
• $\varphi$ meson self-energy in nuclear matter from $\varphi N$ resonant interactions
• Re-analysis of the $\Lambda (1520)$ photoproduction reaction
• Indication of a p-$\varphi$ bound state from a correlation function analysis
• $\varphi$ meson transparency in nuclei from $\varphi N$ resonant interactions
• $f_2(1810)$ as a triangle singularity
• Photoproduction of $K^{+}\Lambda (1405)\to K^{+}{\pi }^0{\Sigma }^0$ extending to forward angles and low momentum transfer
• The role of the triangle singularity in $\Lambda (1405)$ production in the ${\pi }^{-}p\to K^0\pi \Sigma$ and $pp\to p{K}^{+}\pi \Sigma$ processes
• Observation of a cusp-like structure in the $\gamma p\to K^{+}{\Sigma }^0$ cross section at forward angles and low momentum transfer
• Photoproduction of the $f_2^{\prime }(1525)$ and $K_2^{\ast }(1430)$
• Photoproduction of the $f_2(1270)$ resonance
• Measurement of double polarisation asymmetries in $\omega$-photoproduction
• The $\rho (\omega )B^{\ast }(B)$ interaction and states of $J=0,1,2$
• Examination of the $\varphi -NN$ bound-state problem with lattice QCD $N-\varphi$ potentials
• Measurement of polarisation observables in $K_s^0{\Sigma }^{+}$ photoproduction off the proton
• The molecular nature of some exotic hadrons
• Strange meson-baryon interaction in hot and dense medium: recent progress for a road to GSI/FAIR
• The scalar-isovector sector in the extended Linear Sigma Model
• Studies on the $K^{\ast }\Sigma$ bound-state via $K^{+}p\to K^{+}\varphi p$
• Recent Developments on Hadron Interaction and Dynamically Generated Resonances