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Double-polarization observable G in neutral-pion photoproduction off the proton

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Abstract.

This paper reports on a measurement of the double-polarization observable G in \( \pi^0\) photoproduction off the proton using the CBELSA/TAPS experiment at the ELSA accelerator in Bonn. The observable G is determined from reactions of linearly polarized photons with longitudinally polarized protons. The polarized photons are produced by bremsstrahlung off a diamond radiator of well-defined orientation. A frozen spin butanol target provides the polarized protons. The data cover the photon energy range from 617 to 1325 MeV and a wide angular range. The experimental results for G are compared to predictions by the Bonn-Gatchina (BnGa), Jülich-Bonn (JüBo), MAID and SAID partial wave analyses. Implications of the new data for the pion photoproduction multipoles are discussed.

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Authors and Affiliations

  1. Helmholtz-Institut für Strahlen, und Kernphysik der Universität Bonn, Bonn, Germany

    A. Thiel, M. Lang, F. Afzal, A. V. Anisovich, D. Bayadilov, R. Beck, K. -T. Brinkmann, S. Böse, Ch. Funke, M. Gottschall, M. Grüner, E. Gutz, Ch. Hammann, J. Hannappel, J. Hartmann, Ph. Hoffmeister, Ch. Honisch, D. Kaiser, H. Kalinowsky, F. Kalischewski, P. Klassen, E. Klempt, K. Koop, M. Kube, Ph. Mahlberg, J. Müller, J. Müllers, V. Nikonov, D. Piontek, A. Sarantsev, Ch. Schmidt, T. Seifen, V. Sokhoyan, K. Spieker, U. Thoma, M. Urban, H. van Pee, D. Walther, Ch. Wendel, A. Wilson & A. Winnebeck

  2. Physikalisches Institut, Universität Bonn, Bonn, Germany

    H. Eberhardt, B. Bantes, H. Dutz, D. Elsner, R. Ewald, K. Fornet-Ponse, F. Frommberger, St. Goertz, D. Hammann, W. Hillert, T. Jude, S. Kammer, V. Kleber, F. Klein, S. Reeve, S. Runkel & H. Schmieden

  3. Petersburg Nuclear Physics Institute, Gatchina, Russia

    A. V. Anisovich, D. Bayadilov, A. Gridnev, I. Lopatin, V. Nikonov & A. Sarantsev

  4. Institut für Experimentalphysik I, Ruhr-Universität Bochum, Bochum, Germany

    M. Bichow, W. Meyer & G. Reicherz

  5. Institut für Physik, Universität Basel, Basel, Switzerland

    M. Dieterle, I. Keshelashvili, B. Krusche & L. Witthauer

  6. Department of Physics, Florida State University, Tallahassee, FL, USA

    V. Crede & A. Wilson

  7. II. Physikalisches Institut, Universität Gießen, Gießen, Germany

    K. -T. Brinkmann, St. Friedrich, E. Gutz, K. Makonyi, V. Metag & M. Nanova

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  1. A. Thiel
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  2. H. Eberhardt
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  3. M. Lang
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Consortia

The CBELSA/TAPS Collaboration

Corresponding author

Correspondence to A. Thiel.

Additional information

Communicated by Z.-E. Meziani

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The CBELSA/TAPS Collaboration., Thiel, A., Eberhardt, H. et al. Double-polarization observable G in neutral-pion photoproduction off the proton. Eur. Phys. J. A 53, 8 (2017). https://doi.org/10.1140/epja/i2017-12194-8

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