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29 March 2024
 
  » arxiv » 1909.2032

 Article overview


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.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 ;
Date 4 Sep 2019
AbstractThe 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 $10^{-4}~mathrm{fm}^{4}$.
Source arXiv, 1909.2032
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