Extracting the 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.; Heijkenskjöld, L.; Käser, A.; Kashevarov, V. L.; Kay, S.; Keshelashvili, I.; Kondratiev, R.; Korolija, M.; Krusche, B.; Lazarev, A. B.; Linturi, James 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.
Date:
2020-09
Abstract:
The Compton double-polarization observable
Σ
2
z
has been measured for the first time in the
Δ
(
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 in
γ
E
1
E
1
=
−
2.87
±
0.52
,
γ
M
1
M
1
=
2.70
±
0.43
,
γ
E
1
M
2
=
−
0.85
±
0.72
, and
γ
M
1
E
2
=
2.04
±
0.43
, in units of
10
−
4
fm
4
.
Description:
DOI: 10.1103/PhysRevC.102.035205
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