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Measurements of Double-Polarized Compton Scattering Asymmetries and Extraction of the Proton Spin Polarizabilities.
- Source :
-
Physical Review Letters . 3/20/2015, Vol. 114 Issue 11, p112501-1-112501-5. 5p. - Publication Year :
- 2015
-
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 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- 4fm4. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00319007
- Volume :
- 114
- Issue :
- 11
- Database :
- Academic Search Index
- Journal :
- Physical Review Letters
- Publication Type :
- Academic Journal
- Accession number :
- 102088584
- Full Text :
- https://doi.org/10.1103/PhysRevLett.114.112501