Spin observables in pion photoproduction from a unitary and causal effective field theory

Details Spin observables in pion photoproduction from a unitary and causal effective field theory Spin observables in pion photoproduction from a unitary and causal effective field theory

2010-12-29

arxiv.org/abs/1012.5948v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 5 figures, writeup of two talks presented at the NAPP 2010 conference and the Crystal-Ball Collaboration meeting in

Scientific paper

Pion photoproduction is analyzed with the chiral Lagrangian. Partial-wave amplitudes are obtained by an analytic extrapolation of subthreshold reaction amplitudes computed in chiral perturbation theory, where the constraints set by electromagnetic-gauge invariance, causality and unitarity are used to stabilize the extrapolation. The experimental data set is reproduced up to energies $\sqrt{s}\simeq 1300$ MeV in terms of the parameters relevant at order $Q^3$. We present and discuss predictions for various spin observables.

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