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    First measurement of a20(1320) polarized photoproduction cross section

    F. Afzal4, C. S. Akondi10, M. Albrecht27,*, M. Amaryan24, S. Arrigo33, V. Arroyave9, A. Asaturyan27, A. Austregesilo27, Z. Baldwin5 et al. (GlueX Collaboration)

    Z. Baldwin5, F. Barbosa27, J. Barlow10,26, E. Barriga10, R. Barsotti15, D. Barton24, V. Baturin24, V. V. Berdnikov27, T. Black23, W. Boeglin9, M. Boer31, W. J. Briscoe11, T. Britton27, S. Cao10, E. Chudakov27, G. Chung31, P. L. Cole17, O. Cortes11, V. Crede10, M. M. Dalton27, D. Darulis12, A. Deur27, S. Dobbs10, A. Dolgolenko16, M. Dugger1, R. Dzhygadlo13, D. Ebersole10, M. Edo7, H. Egiyan27, T. Erbora9, P. Eugenio10, A. Fabrizi18, C. Fanelli33, S. Fang14, J. Fitches12, A. M. Foda13, S. Furletov27, L. Gan23, H. Gao8, A. Gardner1, A. Gasparian22, D. I. Glazier12, C. Gleason30, V. S. Goryachev16, B. Grube27, J. Guo5, L. Guo9, J. Hernandez10, K. Hernandez1, N. D. Hoffman5, D. Hornidge20, G. Hou14, P. Hurck12, A. Hurley33, W. Imoehl5, D. G. Ireland12, M. M. Ito10, I. Jaegle27, N. S. Jarvis5, T. Jeske27, M. Jing14, R. T. Jones7, V. Kakoyan35, G. Kalicy6, V. Khachatryan15, C. Kourkoumelis2, A. LaDuke5, I. Larin27, D. Lawrence27, D. I. Lersch27, H. Li33, B. Liu14, K. Livingston12, G. J. Lolos25, L. Lorenti33, V. Lyubovitskij29,28, R. Ma14, A. Mahmood25, H. Marukyan35, V. Matveev16, M. McCaughan27, M. McCracken5,32, C. A. Meyer5, R. Miskimen18, R. E. Mitchell15, K. Mizutani27, P. Moran33, V. Neelamana25, L. Ng27,†, E. Nissen27, S. Orešić25, A. I. Ostrovidov10, Z. Papandreou25, C. Paudel9, R. Pedroni22, L. Pentchev27, K. J. Peters13, E. Prather7, L. Puthiya Veetil23, S. Rakshit10, J. Reinhold9, A. Remington10, B. G. Ritchie1, J. Ritman13,3, G. Rodriguez10, D. Romanov19, K. Saldana15, C. Salgado21, S. Schadmand13, A. M. Schertz15, K. Scheuer33, A. Schick18, A. Schmidt11, R. A. Schumacher5, J. Schwiening13, M. Scott11, N. Septian10, P. Sharp11, X. Shen14, M. R. Shepherd15, J. Sikes15, A. Smith27, E. S. Smith33, D. I. Sober6, A. Somov27, S. Somov19, J. R. Stevens33, I. I. Strakovsky11, B. Sumner1, K. Suresh33, V. V. Tarasov16, S. Taylor27, A. Teymurazyan25, A. Thiel4, T. Viducic24, T. Whitlatch27, N. Wickramaarachchi6, Y. Wunderlich4, B. Yu8, J. Zarling25, Z. Zhang34, X. Zhou34, and B. Zihlmann27 (GlueX Collaboration)

    • 1Polytechnic Sciences and Mathematics, School of Applied Sciences and Arts, Arizona State University, Tempe, Arizona 85287, USA
    • 2Department of Physics, National and Kapodistrian University of Athens, 15771 Athens, Greece
    • 3Ruhr-Universität-Bochum, Institut für Experimentalphysik, D-44801 Bochum, Germany
    • 4Helmholtz-Institut für Strahlen- und Kernphysik Universität Bonn, D-53115 Bonn, Germany
    • 5Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
    • 6Department of Physics, The Catholic University of America, Washington, D.C. 20064, USA
    • 7Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA
    • 8Department of Physics, Duke University, Durham, North Carolina 27708, USA
    • 9Department of Physics, Florida International University, Miami, Florida 33199, USA
    • 10Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
    • 11Department of Physics, The George Washington University, Washington, D.C. 20052, USA
    • 12School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
    • 13GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
    • 14Institute of High Energy Physics, Beijing 100049, People's Republic of China
    • 15Department of Physics, Indiana University, Bloomington, Indiana 47405, USA
    • 16National Research Centre Kurchatov Institute, Moscow 123182, Russia
    • 17Department of Physics, Lamar University, Beaumont, Texas 77710, USA
    • 18Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA
    • 19National Research Nuclear University Moscow Engineering Physics Institute, Moscow 115409, Russia
    • 20Department of Physics, Mount Allison University, Sackville, New Brunswick E4L 1E6, Canada
    • 21Department of Physics, Norfolk State University, Norfolk, Virginia 23504, USA
    • 22Department of Physics, North Carolina A&T State University, Greensboro, North Carolina 27411, USA
    • 23Department of Physics and Physical Oceanography, University of North Carolina at Wilmington, Wilmington, North Carolina 28403, USA
    • 24Department of Physics, Old Dominion University, Norfolk, Virginia 23529, USA
    • 25Department of Physics, University of Regina, Regina, Saskatchewan S4S 0A2, Canada
    • 26Department of Mathematics, Physics, and Computer Science, Springfield College, Springfield, Massachusetts, 01109, USA
    • 27Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
    • 28Laboratory of Particle Physics, Tomsk Polytechnic University, 634050 Tomsk, Russia
    • 29Department of Physics, Tomsk State University, 634050 Tomsk, Russia
    • 30Department of Physics and Astronomy, Union College, Schenectady, New York 12308, USA
    • 31Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA
    • 32Department of Physics, Washington & Jefferson College, Washington, Pennsylvania 15301, USA
    • 33Department of Physics, William & Mary, Williamsburg, Virginia 23185, USA
    • 34School of Physics and Technology, Wuhan University, Wuhan, Hubei 430072, People's Republic of China
    • 35A. I. Alikhanyan National Science Laboratory (Yerevan Physics Institute), 0036 Yerevan, Armenia

    • *Contact author: malte@jlab.org
    • †Contact author: lng@jlab.org

    Phys. Rev. C 112, 015204 – Published 8 July, 2025

    DOI: https://doi.org/10.1103/jfzb-rfl4

    Abstract

    We measure for the first time the differential photoproduction cross section dσ/dt of the a2(1320) meson at an average photon beam energy of 8.5 GeV, using data with an integrated luminosity of 104 pb−1 collected by the GlueX experiment. We fully reconstruct the γp→ηπ0p reaction and perform a partial-wave analysis in the a2(1320) mass region with amplitudes that incorporate the linear polarization of the beam. This allows us to separate for the first time the contributions of natural- and unnatural-parity exchanges. These measurements provide novel information about the photoproduction mechanism, which is critical for the search for spin-exotic states.

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