Photoproduction of neutral pion pairs in the Coulomb field of the nucleus

Abstract

The total cross section for Coulomb photoproduction of neutral pion pairs in the reaction gamma A --> pi0 pi0 A is estimated within the effective chiral lagrangian approach. The amplitude of gamma gamma* --> pi0 pi0 with one off-shell photon is calculated at O(p^6) in the momentum expansion; in addition, nuclear absorption is taken into account. Besides its experimental feasibility, the results of the calculation demonstrate that the reaction gamma A --> pi0 pi0 A is a powerful source of information on the process gamma gamma --> pi0 pi0 close to threshold.

18 pages, 6 figures, uses epsf, ioplppt.sty, iopl12.sty (included); Added a discussion of main background from double pion photoproduction on nucleon gamma N --> 2pi0 N via baryon resonance exchange mechanism

References in corpus (8)

• Nambu Jona-Lasinio Like Models and the Low Energy Effective Action of QCD
• Extension of the Chiral Perturbation Theory Meson Lagrangian to Order $P^6$
• Low-Energy Photon-Photon Collisions to Two-Loop Order
• Double Pion Photoproduction on the Nucleon: Study of the Isospin Channels
• Photon-Photon Scattering, Pion Polarizability and Chiral Symmetry
• The Reaction $\gamma \gamma \to {\pi }^0{\pi }^0$ in Generalized Chiral Perturbation Theory
• $\gamma \gamma \to {\pi }^0{\pi }^0$ and $\eta \to {\pi }^0\gamma \gamma$ at $O(p^6)$ in the NJL model
• An Effective Chiral Meson Lagrangian at $O(P^6)$ from the NJL Model

Cited by in corpus (1)

• Generalized polarizabilities of the pion in chiral perturbation theory