Measurements of Double-Polarized Compton Scattering Asymmetries and Extraction of the Proton Spin Polarizabilities
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. · Barrientos, P. Hall · 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. · Spina, H. Ortega · 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. · Wolfes, M.
الأصل · EN
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 measure 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.
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