Measurements of double-polarized compton scattering asymmetries and extraction of the proton spin polarizabilities

Martel, P. P. et al. (2015) Measurements of double-polarized compton scattering asymmetries and extraction of the proton spin polarizabilities. Physical Review Letters, 114(11), 112501. (doi:10.1103/PhysRevLett.114.112501)

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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 10−4  fm4.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Glazier, Dr Derek and MacGregor, Professor I and Livingston, Dr Kenneth and Howdle, Mr David and Annand, Dr John and Hamilton, Dr David
Authors: Martel, P. P., Miskimen, R., Aguar-Bartolome, P., Ahrens, J., Akondi, C. S., Annand, J. R. M., Arends, H. J., Barnes, W., Beck, R., Bernstein, A., Borisov, N., Braghieri, A., Briscoe, W. J., Cherepnya, S., Collicott, C., Costanza, S., Denig, A., Dieterle, M., Downie, E. J., Fil’kov, L. V., Garni, S., Glazier, D. I., Gradl, W., Gurevich, G., Hall Barrientos, P., Hamilton, D., Hornidge, D., Howdle, D., Huber, G. M., Jude, T. C., Kaeser, A., Kashevarov, V. L., Keshelashvili, I., Kondratiev, R., Korolija, M., Krusche, B., Lazarev, A., Lisin, V., Livingston, K., MacGregor, I. J. D., Mancell, J., Manley, D. M., Meyer, W., Middleton, D. G., Mushkarenkov, A., Nefkens, B. M. K., Neganov, A., Nikolaev, A., Oberle, M., Ortega Spina, H., Ostrick, M., Ott, P., Otte, P. B., Oussena, B., Pedroni, P., Polonski, A., Polyansky, V., Prakhov, S., Rajabi, A., Reicherz, G., Rostomyan, T., Sarty, A., Schrauf, S., Schumann, S., Sikora, M. H., Starostin, A., Steffen, O., Strakovsky, I. I., Strub, T., Supek, I., Thiel, M., Tiator, L., Thomas, A., Unverzagt, M., Usov, Y., Watts, D. P., Witthauer, L., Werthmüller, D., and Wolfes, M.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN:0031-9007
ISSN (Online):1079-7114
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