Spin asymmetry for the 16O(gamma,pi- p) reaction in the Delta(1232) region within an effective Lagrangian approach

Abstract

The spin asymmetry of the photon in the exclusive A(gamma,pi N)A-1 reaction is computed employing a recently developed fully relativistic model based on elementary pion production amplitudes that include a consistent treatment of the spin-3/2 nucleon resonances. We compare the results of this model to the only available data on Oxygen [Phys. Rev. C 61 (2000) 054609] and find that, contrary to other models, the predicted spin asymmetry compares well to the available experimental data in the Delta(1232) region. Our results indicate that no major medium modifications in the Delta(1232) properties are needed in order to describe the measured spin asymmetries.

arXiv comment16 pages, 7 figures. To be published in Physics Letters B

References in corpus (28)

• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The Cosmological Parameters 2006
• A unitary isobar model for pion photo- and electroproduction on the proton up to 1 GeV
• Meson-exchange Model for $\pi N$ scattering and $\gamma N->\pi N$ reaction
• Effective theory of the Delta(1232) in Compton scattering off the nucleon
• Analysis of Pion Photoproduction Data
• Dynamical Study of the Delta Excitation in N(e,e' pi) Reactions
• Study of Non-Strange Baryon Resonances with Meson Photoproduction
• Quantization of an interacting spin-3/2 field and the Delta isobar
• Field theory of nucleon to higher-spin baryon transitions
• A unitary model for meson-nucleon scattering
• Multipole Amplitudes of Pion Photoproduction on Nucleons up to 2GeV within Dispersion Relations and Unitary Isobar Model
• Photoproduction of pi0-mesons from nuclei
• Pion photoproduction on the nucleon in the quark model
• Analysis of factorization in (e,e'p) reactions: A survey of the relativistic plane wave impulse approximation
• Effective Lagrangian Approach to pion photoproduction from the nucleon
• A Genetic Algorithm Analysis of N* Resonances in $p(\gamma ,K^{+})\Lambda$ Reactions
• Relativistic current densities for bound spin-orbit partners and the longitudinal-transverse response in (e,e'p) processes
• Pion photoproduction on nucleons in a covariant hadron-exchange model
• Electromagnetic Couplings of Nucleon Resonances
• Measurement of Inverse Pion Photoproduction at Energies Spanning the N(1440) Resonance
• RPWIA analysis of dynamical relativistic contributions in ${}^{16}O(\vec{e},e^{\prime }\vec{p})$ reactions
• A$(\vec{e},e^{\prime }\vec{p})$B responses: from bare nucleons to complex nuclei
• Hints on the quadrupole deformation of the $\Delta$(1232)
• Crossing symmetry and phenomenological widths in effective Lagrangian models of the pion photoproduction process
• Eta Photoproduction as a Test of the Extended Chiral Symmetry
• Analysis of the quadrupole deformation of $\Delta$(1232) within an effective Lagrangian model for pion photoproduction from the nucleon
• Higher Nucleon Resonances in Exclusive $(\gamma ,\pi N)$ Reactions on Nuclei

Cited by in corpus (3)

• Nuclear effects in electron- and neutrino-nucleus scattering within a relativistic quantum mechanical framework
• Electron- versus neutrino-nucleus scattering
• Pion production within the hybrid relativistic plane wave impulse approximation model at MiniBooNE and MINERvA kinematics