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EnglishFixed-t subtracted dispersion relations are presented for Compton scattering off the nucleon at energies Eγ<~500 MeV, as a formalism to extract the nucleon polarizabilities with a minimum of model dependence. The subtracted dispersion integrals are mainly saturated by πN intermediate states in the s channel, γN⃗πN⃗γN, and ππ intermediate states in the t channel, γγ⃗ππ⃗NN̅ . For the subprocess γγ⃗ππ, we construct a unitarized amplitude and find a good description of the available data. We show results for Compton scattering using the subtracted dispersion relations and display the sensitivity on the scalar polarizability difference α-β and the backward spin polarizability γπ, which enter directly as fit parameters in the present formalism. Double polarization observables are shown to have a unique potential for measuring the spin polarizabilities of the nucleon.
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| Titolo: | Fixed-t subtracted dispersion relations for real Compton scattering off the nucleon |
| Autori: | |
| Data di pubblicazione: | 2000 |
| Rivista: | |
| Abstract: | Fixed-t subtracted dispersion relations are presented for Compton scattering off the nucleon at energies Eγ<~500 MeV, as a formalism to extract the nucleon polarizabilities with a minimum of model dependence. The subtracted dispersion integrals are mainly saturated by πN intermediate states in the s channel, γN⃗πN⃗γN, and ππ intermediate states in the t channel, γγ⃗ππ⃗NN̅ . For the subprocess γγ⃗ππ, we construct a unitarized amplitude and find a good description of the available data. We show results for Compton scattering using the subtracted dispersion relations and display the sensitivity on the scalar polarizability difference α-β and the backward spin polarizability γπ, which enter directly as fit parameters in the present formalism. Double polarization observables are shown to have a unique potential for measuring the spin polarizabilities of the nucleon. |
| Handle: | http://hdl.handle.net/11571/115697 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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