Spin polarizabilities of the proton by measurement of Compton
  double-polarization observables

Paudyal, D.; Martel, P. P.; Huber, G. M.; Hornidge, D.; Abt, S; Achenbach, P.; Adlarson, P.; Afzal, F; Ahmed, Z.; Akondi, C. S.; Annand, J. R. M.; Arends, H. J.; Bashkanov, M.; Beck, R.; Biroth, M.; Borisov, N. S.; Braghieri, A; Briscoe, W. J.; Cividini, F.; Costanza, S; Collicott, C.; Denig, A.; Dieterle, M; Downie, E. J.; Drexler, P.; Ferretti-Bondy, M. I.; Gardner, S.; Garni, S.; Glazier, D. I.; Glowa, D.; Gorodnov, I.; Gradl, W; Günther, S.; Gurevich, G. M.; Hamilton, D.; Käser, A.; Kashevarov, V. L.; Kay, S; Keshelashvili, I.; Kondratiev, R.; Korolija, M.; Krusche, B; Lazarev, A. B.; Linturi, J. M.; Lisin, V.; Livingston, K.; Lutterer, S.; MacGregor, I. J. D.; MacRae, R.; Mancell, J.; Manley, D. M.; Metag, V.; Meyer, W.; Miskimen, R.; Mornacchi, E.; Mullen, C.; Mushkarenkov, A.; Neganov, A. B.; Neiser, A.; Oberle, M; Ostrick, M.; Otte, P. B.; Pedroni, P; Polonski, A.; Powell, A.; Prakhov, S. N.; Rajabi, A; Reicherz, G.; Ron, G.; Rostomyan, T.; Sarty, A.; Sfienti, C; Sikora, M. H.; Sokhoyan, V.; Spieker, K; Steffen, O.; Strakovsky, I. I.; Strub, Th.; Supek, I.; Thiel, A.; Thiel, M.; Thomas, A.; Unverzagt, M.; Usov, Yu. A.; Wagner, S.; Walford, N. K.; Watts, D. P.; Werthmüller, D.; Wettig, J.; Witthauer, L.; Wolfes, M.; Zana, L.

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Spin polarizabilities of the proton by measurement of Compton double-polarization observables

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Author(s): D. Paudyal , P. P. Martel , G. M. Huber , D. Hornidge , S. Abt , P. Achenbach , P. Adlarson , F. Afzal , Z. Ahmed , C. S. Akondi , J. R. M. Annand , H. J. Arends , M. Bashkanov , R. Beck , M. Biroth , N. S. Borisov , A. Braghieri , W. J. Briscoe , F. Cividini , S. Costanza , C. Collicott , A. Denig , M. Dieterle , E. J. Downie , P. Drexler , M. I. Ferretti-Bondy , S. Gardner , S. Garni , D. I. Glazier , D. Glowa , I. Gorodnov , W. Gradl , S. Günther , G. M. Gurevich , D. Hamilton , A. Käser , V. L. Kashevarov , S. Kay , I. Keshelashvili , R. Kondratiev , M. Korolija , B. Krusche , A. B. Lazarev , J. M. Linturi , V. Lisin , K. Livingston , S. Lutterer , I. J. D. MacGregor , R. Macrae , J. Mancell , D. M. Manley , V. Metag , W. Meyer , R. Miskimen , E. Mornacchi , C. Mullen , A. Mushkarenkov , A. B. Neganov , A. Neiser , M. Oberle , M. Ostrick , P. B. Otte , P. Pedroni , A. Polonski , A. Powell , S. N. Prakhov , A. Rajabi , G. Reicherz , G. Ron , T. Rostomyan , A. Sarty , C. Sfienti , M. H. Sikora , V. Sokhoyan , K. Spieker , O. Steffen , I. I. Strakovsky , Th. Strub , I. Supek , A. Thiel , M. Thiel , A. Thomas , M. Unverzagt , Yu. A. Usov , S. Wagner , N. K. Walford , D. P. Watts , D. Werthmüller , J. Wettig , L. Witthauer , M. Wolfes , L. Zana

Publication date Created: 04 September 2019

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Abstract

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 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 dispersion relation and chiral perturbation theory calculations, with the former resulting in: \(\gamma_{E1E1} = -3.18 \pm 0.52\), \(\gamma_{M1M1} = 2.98 \pm 0.43\), \(\gamma_{E1M2} = -0.44 \pm 0.67\) and \(\gamma_{M1E2} = 1.58 \pm 0.43\), in units of \(10^{-4}~\mathrm{fm}^{4}\).