Coherent eta-photoproduction from nuclei in a relativistic impulse approximation approach

Abstract

We study coherent eta-photoproduction from nuclei in a relativistic impulse approximation approach. For the elementary production amplitude we use a standard relativistic parameterization based on a set of four Lorentz- and gauge-invariant amplitudes. The photonuclear amplitude is evaluated without recourse to a nonrelativistic reduction; the full relativistic structure of the amplitude is maintained. On general arguments we show that the coherent process is sensitive to only one of the elementary amplitudes. Moreover, we show that the nuclear structure information is fully contained in the ground-state tensor density. The tensor density is evaluated in a mean-field approximation to the Walecka model and it is shown to be sensitive to relativistic effects. Distortion effects are incorporated through an eta-nucleus optical potential that is computed in a simple t-rho approximation.

arXiv comment11 pages and 4 postscript figures

References in corpus (2)

• Effective Lagrangian Approach to the Theory of Eta Photoproduction in the $N^{\ast }(1535)$ Region
• Extraction of the Ratio of the N^*(1535) Electromagnetic Helicity Amplitudes from Eta Photoproduction off Neutrons and Protons

Cited by in corpus (11)

• Coherent Photoproduction of Pions on Spin-Zero Nuclei in a relativistic, non-local Model
• A Covariant OBE Model for $\eta$ Production in NN Collisions
• Coherent Photoproduction of Eta-Mesons on Spin-Zero Nuclei in a Relativistic, Non-local Model
• Primakoff production of ${\pi }^0$, $\eta$ and ${\eta }^{\prime }$ in the Coulomb field of a nucleus
• Lessons to be learned from the coherent photoproduction of pseudoscalar mesons
• Nuclear dependence of the coherent eta photoproduction reaction in a relativistic approach
• Quasifree kaon-photoproduction from nuclei in a relativistic approach
• Relativistic Calculations for Incoherent Photoproduction of Eta Mesons
• Non-locality and Medium Effects in the Exclusive Photoproduction of Eta Mesons on Nuclei
• Quasifree eta photoproduction from nuclei and medium modifications of resonances
• Associated hyperon-kaon production via neutrino-nucleus scattering