Measurements of double-polarized compton scattering asymmetries and extraction of the proton spin polarizabilities.
Phys Rev Lett
; 114(11): 112501, 2015 Mar 20.
Article
em En
| MEDLINE
| ID: mdl-25839263
ABSTRACT
The spin polarizabilities of the nucleon describe how the spin of the nucleon responds to an incident polarized photon. The most model-independent way to extract the nucleon spin polarizabilities is through polarized Compton scattering. Double-polarized Compton scattering asymmetries on the proton were measured in the Δ(1232) region using circularly polarized incident photons and a transversely polarized proton target at the Mainz Microtron. Fits to asymmetry data were performed using a dispersion model calculation and a baryon chiral perturbation theory calculation, and a separation of all four proton spin polarizabilities in the multipole basis was achieved. The analysis based on a dispersion model calculation yields γ(E1E1)=-3.5±1.2, γ(M1M1)=3.16±0.85, γ(E1M2)=-0.7±1.2, and γ(M1E2)=1.99±0.29, in units of 10(-4) fm(4).
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MEDLINE
Idioma:
En
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Phys Rev Lett
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Estados Unidos