Measurements of Double-Polarized Compton Scattering Asymmetries and Extraction of the Proton Spin Polarizabilities
Name
PhysRevLett.114.112501.pdf
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Author(s)
Martel, Philippe Paul
Miskimen, R.
Aguar-Bartolome, P.
Ahrens, J.
Akondi, C. S.
Annand, J. R. M.
Arends, H. J.
Barnes, W.
Beck, R.
Borisov, N.
Date Issued
March 2015
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Martel, P. P., R. Miskimen, P. Aguar-Bartolome, J. Ahrens, C. S. Akondi, J. R. M. Annand, H. J. Arends, et al. “Measurements of Double-Polarized Compton Scattering Asymmetries and Extraction of the Proton Spin Polarizabilities.” Physical Review Letters 114, no. 11 (March 2015). © 2015 American Physical Society
Version
Final published version
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[subscript E1E1] = -3.5 ± 1.2, γ[subscript M1M1] = 3.16 ± 0.85, γ[subscript E1M2] = -0.7 ± 1.2, and γ[subscript M1E2] = 1.99 ± 0.29, in units of 10[superscript -4] fm[superscript 4].
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.114.112501
