Naslov
Measurements of Double-Polarized Compton Scattering Asymmetries and Extraction of the Proton Spin Polarizabilities

Autori
Martel, P.P. ; ... ; Korolija, Milorad ; ... ; Supek, Ivan ; ... ; Wolfes. M.

Izvornik
Physical Review Letters (0031-9007) 114 (2015); 112501-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
spin polarizabilities; nucleon; photon; ∆(1232) region; MAMI

Sažetak
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 γE1E1=-3.5±1.2, γM1M1=3.16±0.85, γE1M2=-0.7±1.2, and γM1E2=1.99±0.29, in units of 10-4  fm4.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA