Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-02-16
Nucl.Phys.A866:79-92,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, 3 figures, revised version
Scientific paper
10.1016/j.nuclphysa.2011.07.005
Proton Compton scattering 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. We present and discuss predictions for various spin observables and polarizabilties of the proton. While for the transition polarizabilities $\gamma_{E1M2}, \gamma_{M1E2}$ we recover the results of strict chiral perturbation theory, for the diagonal $\gamma_{E1E1}, \gamma_{M1M1}$ elements we find significant effects from rescattering.
Gasparyan A. M.
Lutz Matthias F. M.
Pasquini Barbara
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