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High statistics study of the reaction γp → pπ0 η

  • Regular Article - Experimental Physics
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Abstract

Photoproduction off protons of the pπ 0 η three-body final state was studied with the Crystal Barrel/TAPS detector, at the electron stretcher accelerator ELSA in Bonn, for incident energies from the π 0 η production threshold up to 2.5 GeV. Differential cross sections and the total cross sections are presented. The use of linearly polarized photons gives access to the polarization observables Σ, I s, and I c, the latter two characterize beam asymmetries in case of three-body final states. Δ(1232)η, N(1535)1/2− π, and pa 0(980) are the dominant isobars contributing to the reaction. The partial wave analysis confirms the existence of some nucleon and Δ resonances, for which so far only fair evidence was reported. A large number of decay modes of known nucleon and Δ resonances is presented. It is shown that detailed investigations of decay branching ratios may provide a key to unravelling the structure of nucleon and Δ resonances.

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Author information

Author notes

  1. V. Sokhoyan & M. Ostrick

    Present address: Institut für Kernphysik, Universität Mainz, Mainz, Germany

  2. V. Kleber

    Present address: German Research School for Simulation Sciences, Jülich, Germany

  3. L. Pant

    Present address: Nucl. Phys. Div., BARC, Mumbai, India

  4. A. Roy, A. Süle & R. Varma

    Present address: Department of Physics, IIT, Mumbai, India

Authors and Affiliations

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

    E. Gutz, V. Sokhoyan, H. van Pee, A. V. Anisovich, O. Bartholomy, D. Bayadilov, R. Beck, M. Fuchs, Ch. Funke, Ph. Hoffmeister, I. Horn, J. Junkersfeld, H. Kalinowsky, E. Klempt, M. Lang, V. A. Nikonov, D. Novinsky, D. Piontek, A. V. Sarantsev, Ch. Schmidt, T. Szczepanek, A. Thiel, U. Thoma, D. Walther, Ch. Wendel & A. Wilson

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

    E. Gutz, R. Gregor, M. Kotulla, S. Lugert, R. Novotny, L. Pant, M. Pfeiffer, A. Roy, D. Trnka & R. Varma

  3. Department of Physics, Florida State University, Tallahassee, USA

    V. Crede, V. Metag, M. Nanova & A. Wilson

  4. Petersburg Nuclear Physics Institute, Gatchina, Russia

    A. V. Anisovich, D. Bayadilov, Y. A. Beloglazov, A. B. Gridnev, I. V. Lopatin, V. A. Nikonov, D. Novinsky, A. V. Sarantsev & V. V. Sumachev

  5. Kernfysisch Versneller Instituut, Groningen, The Netherlands

    J. C. S. Bacelar, R. Castelijns, H. Löhner, J. G. Messchendorp & S. Shende

  6. Physikalisches Institut, Universität Bonn, Bonn, Germany

    B. Bantes, H. Dutz, D. Elsner, R. Ewald, F. Frommberger, W. Hillert, S. Kammer, V. Kleber, Frank Klein, Friedrich Klein, M. Ostrick, H. Schmieden, A. Süle & D. Walther

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

    I. Jaegle, M. Kotulla, B. Krusche & T. Mertens

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  1. E. Gutz
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The CBELSA/TAPS Collaboration

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Correspondence to E. Klempt.

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Communicated by H. Ströher

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The CBELSA/TAPS Collaboration., Gutz, E., Crede, V. et al. High statistics study of the reaction γp → pπ0 η . Eur. Phys. J. A 50, 74 (2014). https://doi.org/10.1140/epja/i2014-14074-1

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  • DOI: https://doi.org/10.1140/epja/i2014-14074-1

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