Extracting the spin polarizabilities of the proton by measurement of Compton double-polarization observables

Paudyal, D. and Martel, P. P. and Huber, G. M. and Hornidge, D. and Abt, S. and Achenbach, P. and Adlarson, P. and Afzal, F. and Ahmed, Z. and Akondi, C. S. and Annand, J. R. M. and Arends, H. J. and Bashkanov, M. and Beck, R. and Biroth, M. and Borisov, N. S. and Braghieri, A. and Briscoe, W. J. and Cividini, F. and Costanza, S. and Collicott, C. and Denig, A. and Dieterle, M. and Downie, E. J. and Drexler, P. and Ferretti-Bondy, I. and Gardner, S. and Garni, S. and Glazier, I. and Glowa, D. and Gorodnov, I. and Gradl, W. and Guenther, S. and Gurevich, G. M. and Hamilton, D. and Heijkenskjoeld, L. and Kaeser, A. and Kashevarov, V. L. and Kay, S. and Keshelashvili, I. and Kondratiev, R. and Korolija, M. and Krusche, B. and Lazarev, A. B. and Linturi, J. M. and Lisin, V. and Livingston, K. and Lutterer, S. and MacGregor, I. J. D. and Macrae, R. and Mancell, J. and Manley, D. M. and Metag, V. and Meyer, W. and Miskimen, R. and Mornacchi, E. and Mullen, C. and Mushkarenkov, A. and Neganov, A. B. and Neiser, A. and Oberle, M. and Ostrick, M. and Otte, P. B. and Pedroni, P. and Polonski, A. and Powell, A. and Prakhov, S. N. and Rajabi, A. and Reicherz, G. and Ron, G. and Rostomyan, T. and Sarty, A. and Sfienti, C. and Sikora, M. H. and Sokhoyan, V. and Spieker, K. and Steffen, O. and Strakovsky, I. I. and Strub, Th and Supek, I. and Thiel, A. and Thiel, M. and Thomas, A. and Unverzagt, M. and Usov, Yu A. and Wagner, S. and Walford, N. K. and Watts, D. P. and Werthmueller, D. and Wettig, J. and Witthauer, L. and Wolfes, M. and Zana, L. and A2 Collaboration, . (2020) Extracting the spin polarizabilities of the proton by measurement of Compton double-polarization observables. Physical Review C, 102 (3). 035205.

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The Compton double-polarization observable Sigma(2z) has been measured for the first time in the Delta(1232) resonance region using a circularly polarized photon beam incident on a longitudinally polarized proton target at the Mainz Microtron. This paper reports these results, together with the model-dependent extraction of four proton spin polarizabilities from fits to additional asymmetry data using either a dispersion relation calculation or a baryon chiral perturbation theory calculations with the weighted average of these two fits resulting -2.87 0.52, gamma(E1E1) = 2.70 0.43, gamma(E1M2) = in gamma(E1M2) = -0.85 +/- 0.72, and gamma(M1E2) = 2.04 +/- 0.43, in units of 10(-4) fm(4).
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:29 Mar 2021 08:36
Deposited On:29 Mar 2021 08:36

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