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

Martel, P. P. and Miskimen, R. and Aguar-Bartolome, P. and Ahrens, J. and Akondi, C. S. and Annand, J. R. M. and Arends, H. J. and Barnes, W. and Beck, R. and Bernstein, A. and Borisov, N. and Braghieri, A. and Briscoe, W. J. and Cherepnya, S. and Collicott, C. and Costanza, S. and Denig, A. and Dieterle, M. and Downie, E. J. and Fil`kov, L. V. and Garni, S. and Glazier, D. I. and Gradl, W. and Gurevich, G. and Barrientos, P. Hall and Hamilton, D. and Hornidge, D. and Howdle, D. and Huber, G. M. and Jude, T. C. and Kaeser, A. and Kashevarov, V. L. and Keshelashvili, I. and Kondratiev, R. and Korolija, M. and Krusche, B. and Lazarev, A. and Lisin, V. and Livingston, K. and MacGregor, I. J. D. and Mancell, J. and Manley, D. M. and Meyer, W. and Middleton, D. G. and Mushkarenkov, A. and Nefkens, B. M. K. and Neganov, A. and Nikolaev, A. and Oberle, M. and Spina, H. Ortega and Ostrick, M. and Ott, P. and Otte, P. B. and Oussena, B. and Pedroni, P. and Polonski, A. and Polyansky, V. and Prakhov, S. and Rajabi, A. and Reicherz, G. and Rostomyan, T. and Sarty, A. and Schrauf, S. and Schumann, S. and Sikora, M. H. and Starostin, A. and Steffen, O. and Strakovsky, I. I. and Strub, T. and Supek, I. and Thiel, M. and Tiator, L. and Thomas, A. and Unverzagt, M. and Usov, Y. and Watts, D. P. and Witthauer, L. and Werthmueller, D. and Wolfes, M.. (2015) Measurements of double-polarized compton scattering asymmetries and extraction of the proton spin polarizabilities. Physical review letters, 114 (11). p. 112501.

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Official URL: http://edoc.unibas.ch/40397/

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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 Delta(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 gamma(E1E1) = -3.5 +/- 1.2, gamma(M1M1) = 3.16 +/- 0.85, gamma(E1M2) = -0.7 +/- 1.2, and gamma(M1E2) = 1.99 +/- 0.29, in units of 10(-4) fm(4).
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
ISSN:0031-9007
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:30 Jun 2016 11:01
Deposited On:09 May 2016 08:18

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