Year: 2020
Type: article
Abstract: 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.
Source: Physical Review Letters
Authors: M. Dieterle, L. Witthauer, A. Fix, S. Abt, P. Achenbach, P. Adlarson, F. Afzal, P. Aguar Bartolome, Z. Ahmed, J. R. M. Annand, H. J. Arends, M. Bashkanov, R. Beck, M. Biroth, N. Borisov, A. Braghieri, W. J. Briscoe, F. Cividini, C. Collicott, S. Costanza, A. Denig, A. S. Dolzhikov, E. J. Downie, P. Drexler, S. Gardner, D. Ghosal, D. I. Glazier, I. Gorodnov, W. Gradl, M. Günther, D. Gurevich, L. Heijkenskjöld, D. Hornidge, G. M. Huber, A. Käser, V. L. Kashevarov, S. Kay, I. Keshelashvili, R. Kondratiev, M. Korolija, B. Krusche, A. Lazarev, V. Lisin, K. Livingston, S. Lutterer, I. J. D. MacGregor, D. M. Manley, P. P. Martel, V. Metag, W. Meyer, D. G. Middleton, R. Miskimen, E. Mornacchi, C. Mullen, A. Mushkarenkov, A. Neganov, A. Neiser, M. Oberle, M. Ostrick, P. B. Otte, D. Paudyal, P. Pedroni, A. Polonski, A. Powell, S. N. Prakhov, G. Reicherz, G. Ron, T. Rostomyan, A. Sarty, C. Sfienti, V. Sokhoyan, K. Spieker, O. Steffen, I. I. Strakovsky, T. 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, M. Wolfes, L. A. Zana
Institutions: University of Basel, Tomsk Polytechnic University, Johannes Gutenberg University Mainz, University of Bonn, University of Regina, University of Glasgow, University of Edinburgh, Joint Institute for Nuclear Research, Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, George Washington University, Saint Mary's University, Justus-Liebig-Universität Gießen, Institute for Nuclear Research, Mount Allison University, Ruđer Bošković Institute, Kent State University, Ruhr University Bochum, University of Massachusetts Amherst, University of California, Los Angeles, Hebrew University of Jerusalem
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,750
Funders: National Science Foundation, U.S. Department of Energy, Deutsche Forschungsgemeinschaft, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Office of Science, Natural Sciences and Engineering Research Council of Canada, Science and Technology Facilities Council, Instituto Nazionale di Fisica Nucleare, Nuclear Physics
Awards: MEDIUM ENERGY NUCLEAR PHYSICS, G1228249363, G1861050445, G222768804, PRECISION STUDIES OF QCD AND ELECTRO-WEAK INTERACTIONS, Illuminating strongly interacting matter, INVESTIGATIONS OF BARYON SPECTROSCOPY VIA ELECTROMAGNETIC AND HADRONIC SCATTERING, G3795454412, Investigation of the Strong Interaction: Elementary Systems and Nuclei, G4663097347, Investigation of the Strong Interaction: Elementary Systems and Nuclei, Chaire De Recherche Du Canada En Environnement Et Bilan Énergétique., G5599649393, EXPERIMENTAL INVESTIGATIONS OF HADRON SPECTROSCOPY AT ACCELERATOR FACILITIES, G628552264, DATA ANALYSIS CENTER FOR ELECTROMAGNETIC AND HADRONIC SCATTERING PROCESSES, Investigations of the Strong Interaction, Consolidated Grant, Illuminating strongly interacting matter, Transfer of Research Grant Funds (from ST/P004008/1 to ST/P003885/1), Investigations of the Strong Interaction, G723336386, G7285675723, BARYON SPECTROSCOPY THROUGH PARTIAL-WAVE ANALYSIS AND MESON PHOTOPRODUCTION, Exploring new states of matter (New Applicant scheme), IRES -Experimental Nuclear Physics at the Mainz Microtron, G8061258908, Edinburgh Nuclear Physics Group Consolidated Grant Proposal, Hunt for Exotic Particles: Dibaryons, Collaborative Research: COSEE: Ocean Communities in Education And social Networks (COSEE-OCEAN), G9000253170
OpenAlex ID: W3047733559