Extracting the Spin Polarizabilities of the Proton by Measurement of Compton Double-Polarization Observables

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. Ferretti-Bondy,S. Gardner,S. Garni,D. Glazier,D. Glowa,I Gorodnov,W. Gradl, S. Guenther,G. M. Gurevich,D. Hamilton,L. Heijkenskjoeld,A. Kaeser,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. Werthmueller,J. Wettig,L. Witthauer,M. Wolfes,L. Zana

Physical review C（2020）

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摘要

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).

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