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Helicity-Dependent Cross Sections for the Photoproduction of π^{0} Pairs from Nucleons.

  • Dieterle M Department of Physics, University of Basel, CH-4056 Basel, Switzerland.
  • Witthauer L Department of Physics, University of Basel, CH-4056 Basel, Switzerland.
  • Fix A Laboratory of Mathematical Physics, Tomsk Polytechnic University, 634034 Tomsk, Russia.
  • Abt S Department of Physics, University of Basel, CH-4056 Basel, Switzerland.
  • Achenbach P Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Adlarson P Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Afzal F Helmholtz-Institut für Strahlen- und Kernphysik, University Bonn, D-53115 Bonn, Germany.
  • Aguar Bartolome P Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Ahmed Z University of Regina, Regina, Saskatchewan S4S-0A2 Canada.
  • Annand JRM SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.
  • Arends HJ Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Bashkanov M SUPA School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.
  • Beck R Helmholtz-Institut für Strahlen- und Kernphysik, University Bonn, D-53115 Bonn, Germany.
  • Biroth M Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Borisov N Joint Institute for Nuclear Research, 141980 Dubna, Russia.
  • Braghieri A INFN Sezione di Pavia, I-27100 Pavia, Pavia, Italy.
  • Briscoe WJ Center for Nuclear Studies, The George Washington University, Washington, DC 20052, USA.
  • Cividini F Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Collicott C Department of Astronomy and Physics, Saint Mary's University, E4L1E6 Halifax, Canada.
  • Costanza S INFN Sezione di Pavia, I-27100 Pavia, Pavia, Italy.
  • Denig A Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Dolzhikov AS Joint Institute for Nuclear Research, 141980 Dubna, Russia.
  • Downie EJ Center for Nuclear Studies, The George Washington University, Washington, DC 20052, USA.
  • Drexler P Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Gardner S SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.
  • Ghosal D Department of Physics, University of Basel, CH-4056 Basel, Switzerland.
  • Glazier DI SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.
  • Gorodnov I Joint Institute for Nuclear Research, 141980 Dubna, Russia.
  • Gradl W Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Günther M Department of Physics, University of Basel, CH-4056 Basel, Switzerland.
  • Gurevich D Institute for Nuclear Research, RU-125047 Moscow, Russia.
  • Heijkenskjöld L Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Hornidge D Mount Allison University, Sackville, New Brunswick E4L1E6, Canada.
  • Huber GM University of Regina, Regina, Saskatchewan S4S-0A2 Canada.
  • Käser A Department of Physics, University of Basel, CH-4056 Basel, Switzerland.
  • Kashevarov VL Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Kay S SUPA School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.
  • Keshelashvili I Department of Physics, University of Basel, CH-4056 Basel, Switzerland.
  • Kondratiev R Institute for Nuclear Research, RU-125047 Moscow, Russia.
  • Korolija M Rudjer Boskovic Institute, HR-10000 Zagreb, Croatia.
  • Krusche B Department of Physics, University of Basel, CH-4056 Basel, Switzerland.
  • Lazarev A Joint Institute for Nuclear Research, 141980 Dubna, Russia.
  • Lisin V Institute for Nuclear Research, RU-125047 Moscow, Russia.
  • Livingston K SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.
  • Lutterer S Department of Physics, University of Basel, CH-4056 Basel, Switzerland.
  • MacGregor IJD SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.
  • Manley DM Kent State University, Kent, Ohio 44242, USA.
  • Martel PP Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Metag V II. Physikalisches Institut, University of Giessen, D-35392 Giessen, Germany.
  • Meyer W Institut für Experimentalphysik, Ruhr Universität, 44780 Bochum, Germany.
  • Middleton DG Mount Allison University, Sackville, New Brunswick E4L3B5, Canada.
  • Miskimen R University of Massachusetts, Amherst, Massachusetts 01003, USA.
  • Mornacchi E Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Mullen C SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.
  • Mushkarenkov A INFN Sezione di Pavia, I-27100 Pavia, Pavia, Italy.
  • Neganov A Joint Institute for Nuclear Research, 141980 Dubna, Russia.
  • Neiser A Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Oberle M Department of Physics, University of Basel, CH-4056 Basel, Switzerland.
  • Ostrick M Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Otte PB Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Paudyal D University of Regina, Regina, Saskatchewan S4S-0A2 Canada.
  • Pedroni P INFN Sezione di Pavia, I-27100 Pavia, Pavia, Italy.
  • Polonski A Institute for Nuclear Research, RU-125047 Moscow, Russia.
  • Powell A SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.
  • Prakhov SN University of California Los Angeles, Los Angeles, California 90095-1547, USA.
  • Reicherz G Institut für Experimentalphysik, Ruhr Universität, 44780 Bochum, Germany.
  • Ron G Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem 91904, Israel.
  • Rostomyan T Department of Physics, University of Basel, CH-4056 Basel, Switzerland.
  • Sarty A Department of Astronomy and Physics, Saint Mary's University, E4L1E6 Halifax, Canada.
  • Sfienti C Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Sokhoyan V Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Spieker K Helmholtz-Institut für Strahlen- und Kernphysik, University Bonn, D-53115 Bonn, Germany.
  • Steffen O Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Strakovsky II Center for Nuclear Studies, The George Washington University, Washington, DC 20052, USA.
  • Strub T Department of Physics, University of Basel, CH-4056 Basel, Switzerland.
  • Supek I Rudjer Boskovic Institute, HR-10000 Zagreb, Croatia.
  • Thiel A Helmholtz-Institut für Strahlen- und Kernphysik, University Bonn, D-53115 Bonn, Germany.
  • Thiel M Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Thomas A Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Unverzagt M Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Usov YA Joint Institute for Nuclear Research, 141980 Dubna, Russia.
  • Wagner S Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Walford NK Department of Physics, University of Basel, CH-4056 Basel, Switzerland.
  • Watts DP SUPA School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.
  • Werthmüller D Department of Physics, University of Basel, CH-4056 Basel, Switzerland.
  • Wettig J Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Wolfes M Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Zana LA SUPA School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.
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  • 2020-08-27
Published in:
  • Physical review letters. - 2020
English The double-polarization observable E and helicity-dependent cross sections σ_{1/2}, σ_{3/2} have been measured for the photoproduction of π^{0} pairs off quasifree protons and neutrons at the Mainz MAMI accelerator with the Crystal Ball/TAPS setup. A circularly polarized photon beam was produced by bremsstrahlung from longitudinally polarized electrons and impinged on a longitudinally polarized deuterated butanol target. The reaction products were detected with an almost 4π covering calorimeter. The results reveal for the first time the helicity- and isospin-dependent structure of the γN→Nπ^{0}π^{0} reaction. They are compared to predictions from reaction models in view of nucleon resonance contributions and also to a refit of one model that predicted results for the proton and for the neutron target. The comparison of the prediction and the refit demonstrates the large impact of the new data.
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