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arXiv · 1909.02032

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·L. Heijkenskjöld·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
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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 $10^{-4}~\mathrm{fm}^{4}$.

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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, L. Heijkenskjöld, 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. 2019-09-04. Spin polarizabilities of the proton by measurement of Compton double-polarization observables. https://doi.org/10.1103/physrevc.102.035205

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