Fulltext

Photoproduction of π0π0 - and π0π+ -pairs off the proton from threshold to the second resonance region

Zehr, F. ; Krusche, B. ; Aguar, P. ; Ahrens, J. ; Annand, J. ; Arends, H. ; Beck, R. ; Bekrenev, V. ; Boillat, B. ; Braghieri, A. ; Branford, D. ; Briscoe, W. ; Brudvik, J. ; Cherepnya, S. ; Codling, R. ; Downie, E. ; Drexler, P. ; Glazier, D. ; Fil'kov, L. ; Fix, A. ; Gregor, R. ; Heid, E. ; Hornidge, D. ; Jaegle, I. ; Jahn, O. ; Kashevarov, V. ; Knezevic, A. ; Kondratiev, R. ; Korolija, M. ; Kotulla, M. ; Krambrich, D. ; Kulbardis, A. ; Lang, M. ; Lisin, V. ; Livingston, K. ; Lugert, S. ; MacGregor, I. ; Manley, D. ; Maghrbi, Y. ; Martinez, M. ; McGeorge, J. ; Mekterovic, D. ; Metag, V. ; Nefkens, B. ; Nikolaev, A. ; Ostrick, M. ; Pedroni, P. ; Pheron, F. ; Polonski, A. ; Prakhov, S. ; Price, J. ; Rosner, G. ; Rost, M. ; Rostomyan, T. ; Schumann, S. ; Sober, D. ; Starostin, A. ; Supek, I. ; Tarbert, C. ; Thomas, A. ; Unverzagt, M. ; Walcher, Th ; Watts, D.

In: The European Physical Journal A, 2012, vol. 48, no. 7, p. 1-19

Aggiungi alla tua lista
    Titre
    • Photoproduction of π0π0 - and π0π+ -pairs off the proton from threshold to the second resonance region
    Auteur
    • Zehr, F.. Department of Physics, University of Basel, Ch-4056, Basel, Switzerland
    • Krusche, B.. Department of Physics, University of Basel, Ch-4056, Basel, Switzerland
    • Aguar, P.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Ahrens, J.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Annand, J.. SUPA, School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • Arends, H.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Beck, R.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Bekrenev, V.. Petersburg Nuclear Physics Institute, RU-188300, Gatchina, Russia
    • Boillat, B.. Department of Physics, University of Basel, Ch-4056, Basel, Switzerland
    • Braghieri, A.. INFN, Sezione di Pavia, I-27100 Pavia, Pavia, Italy
    • Branford, D.. School of Physics, University of Edinburgh, EH9 3JZ, Edinburgh, UK
    • Briscoe, W.. Center for Nuclear Studies, The George Washington University, DC 20052, Washington, USA
    • Brudvik, J.. University of California Los Angeles, 90095-1547, Los Angeles, California, USA
    • Cherepnya, S.. Lebedev Physical Institute, RU-119991, Moscow, Russia
    • Codling, R.. SUPA, School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • Downie, E.. SUPA, School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • Drexler, P.. II. Physikalisches Institut, University of Giessen, D-35392, Giessen, Germany
    • Glazier, D.. School of Physics, University of Edinburgh, EH9 3JZ, Edinburgh, UK
    • Fil'kov, L.. Lebedev Physical Institute, RU-119991, Moscow, Russia
    • Fix, A.. Laboratory of Mathematical Physics, Tomsk Polytechnic University, Tomsk, Russia
    • Gregor, R.. II. Physikalisches Institut, University of Giessen, D-35392, Giessen, Germany
    • Heid, E.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Hornidge, D.. Mount Allison University, Sackville, E4L3B5, New Brunswick, Canada
    • Jaegle, I.. Department of Physics, University of Basel, Ch-4056, Basel, Switzerland
    • Jahn, O.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Kashevarov, V.. Lebedev Physical Institute, RU-119991, Moscow, Russia
    • Knezevic, A.. Rudjer Boskovic Institute, HR-10000, Zagreb, Croatia
    • Kondratiev, R.. Institute for Nuclear Research, RU-125047, Moscow, Russia
    • Korolija, M.. Rudjer Boskovic Institute, HR-10000, Zagreb, Croatia
    • Kotulla, M.. Department of Physics, University of Basel, Ch-4056, Basel, Switzerland
    • Krambrich, D.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Kulbardis, A.. Petersburg Nuclear Physics Institute, RU-188300, Gatchina, Russia
    • Lang, M.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Lisin, V.. Institute for Nuclear Research, RU-125047, Moscow, Russia
    • Livingston, K.. SUPA, School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • Lugert, S.. II. Physikalisches Institut, University of Giessen, D-35392, Giessen, Germany
    • MacGregor, I.. SUPA, School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • Manley, D.. Kent State University, 44242, Kent, Ohio, USA
    • Maghrbi, Y.. Department of Physics, University of Basel, Ch-4056, Basel, Switzerland
    • Martinez, M.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • McGeorge, J.. SUPA, School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • Mekterovic, D.. Rudjer Boskovic Institute, HR-10000, Zagreb, Croatia
    • Metag, V.. II. Physikalisches Institut, University of Giessen, D-35392, Giessen, Germany
    • Nefkens, B.. University of California Los Angeles, 90095-1547, Los Angeles, California, USA
    • Nikolaev, A.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Ostrick, M.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Pedroni, P.. INFN, Sezione di Pavia, I-27100 Pavia, Pavia, Italy
    • Pheron, F.. Department of Physics, University of Basel, Ch-4056, Basel, Switzerland
    • Polonski, A.. Institute for Nuclear Research, RU-125047, Moscow, Russia
    • Prakhov, S.. University of California Los Angeles, 90095-1547, Los Angeles, California, USA
    • Price, J.. University of California Los Angeles, 90095-1547, Los Angeles, California, USA
    • Rosner, G.. SUPA, School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • Rost, M.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Rostomyan, T.. INFN, Sezione di Pavia, I-27100 Pavia, Pavia, Italy
    • Schumann, S.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Sober, D.. The Catholic University of America, DC 20064, Washington, USA
    • Starostin, A.. University of California Los Angeles, 90095-1547, Los Angeles, California, USA
    • Supek, I.. Rudjer Boskovic Institute, HR-10000, Zagreb, Croatia
    • Tarbert, C.. School of Physics, University of Edinburgh, EH9 3JZ, Edinburgh, UK
    • Thomas, A.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Unverzagt, M.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Walcher, Th. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Watts, D.. School of Physics, University of Edinburgh, EH9 3JZ, Edinburgh, UK
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • The European Physical Journal A, 2012, vol. 48, no. 7, p. 1-19. Springer Berlin Heidelberg
    Autre version électronique
    Classification
    • Technologie, Sciences de l'ingénieur
    Identifiant OAI-PMH
    • oai:doc.rero.ch:320898
    Summary
    Precise total cross-sections and invariant-mass distributions have been measured for photoproduction of pion pairs off the proton producing $\ensuremath p\pi^0\pi^0$ and $\ensuremath n\pi^+\pi^0$ final states from the threshold region up to 800MeV incident photon energy. Additionally, beam helicity asymmetries have been measured in the second resonance region (550MeV-820MeV). The experiment was performed at the tagged photon beam of the Mainz MAMI accelerator with the Crystal Ball and TAPS detectors combined to give an almost 4 $ \pi$ solid-angle electromagnetic calorimeter. The results are much more precise than any previous measurements and confirm the chiral perturbation theory predictions for the threshold behavior of these reactions. In the second resonance region, the invariant-mass distributions of meson-meson and meson-nucleon pairs are in reasonable agreement with model predictions, but none of the models reproduce the asymmetries for the mixed-charge channel