eta photoproduction and N* resonances

Abstract

We investigate the eta photoproduction using the effective Lagrangian approach at the tree level. We focus on the new nucleon resonance N*(1675), which was reported by the GRAAL, CB-ELSA and Tohoku LNS, testing its possible spin and parity states theoretically (J^P=1/2^+-,3/2^+-). In addition, we include six nucleon resonances, D_13(1520), S_11(1535), S_11(1650), D_15(1675), P_11(1710), P_13(1720) as well as the possible background contributions. We calculate various cross sections including beam asymmetries for the neutron and proton targets. We find noticeable isospin asymmetry in transition amplitudes for photon and neutron targets. This observation may indicate that the new resonance can be identified as a non-strangeness member of the baryon antidecuplet.

18 pages, 8 figures

References in corpus (23)

• The Cosmological Parameters 2006
• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• Evidence for Narrow S=+1 Baryon Resonance in Photo-production from Neutron
• Soft-core baryon-baryon potentials for the complete baryon octet
• Effective Lagrangian Approach to the Theory of Eta Photoproduction in the $N^{\ast }(1535)$ Region
• Gauge-invariant tree-level photoproduction amplitudes with form factors
• Photoproduction of eta mesons off protons for photon energies from 0.75 GeV to 3 GeV
• An isobar model for eta photo- and electroproduction on the nucleon
• Evidence for a narrow structure at W~1.68 GeV in eta photoproduction on the neutron
• Nonstrange and other unitarity partners of the exotic Theta+ baryon
• Measurement of eta photoproduction on the proton from threshold to 1500 MeV
• eta-photoproduction in the resonance energy region
• Form factors and photoproduction amplitudes
• On photoexcitation of baryon antidecuplet
• Where are the missing members of the baryon antidecuplet?
• The $\rho$ Spectral Function in a Relativistic Resonance Model
• Lambda(1520,3/2^-) photoproduction reaction via gamma N -> K Lambda(1520)
• A new $N^{\ast }(1675)$ resonance in the $\gamma N\to \eta N$ reaction
• Effective Lagrangian approach to the omega meson photoproduction near threshold
• Extraction of radiative decay width for the non-strange partner of Theta^+
• Exotic and nonexotic magnetic transitions in the context of the SELEX and GRAAL experiments
• Exclusive measurement of coherent eta photoproduction from the deuteron
• Suppression of Theta^+(J^P=3/2^(+,-)) photoproduction from the proton

Cited by in corpus (9)

• Eta-meson production in the resonance energy region
• Axial charges of octet and decuplet baryons
• Lambda(1520) photoproduciton off the proton target with Regge contributions
• Axial charges of the nucleon and N* resonances
• Studies on the polarization transfer coefficients C_x and C_z in the gamma p -> K^+ Lambda(1520,3/2^-) reaction process
• Effects of nucleon resonances on $\eta$ photoproduction off the neutron reexamined
• Mass splittings of the baryon decuplet and antidecuplet with the second-order flavor symmetry breakings within a chiral soliton model
• Effect of the final state interaction of ${\eta }^{\prime }N$ on the ${\eta }^{\prime }$ photoproduction off nucleon
• New narrow nucleon resonances $N^{\ast }(1685)$ and $N^{\ast }(1726)$ within the chiral quark-soliton model