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    Photoproduction of η mesons off the proton for 1.2<Eγ<4.7GeV using CLAS at Jefferson Laboratory

    T. Hu15, Z. Akbar15,*, V. Crede15,†, K. P. Adhikari35,‡, S. Adhikari14, M. J. Amaryan35, G. Angelini16, G. Asryan51, H. Atac41 et al. (CLAS Collaboration)

    H. Atac41, C. Ayerbe Gayoso50, L. Barion18, M. Battaglieri42,20, I. Bedlinskiy31, F. Benmokhtar11, A. Bianconi45,23, A. S. Biselli12, F. Bossù7, S. Boiarinov42, W. J. Briscoe16, W. K. Brooks43, D. S. Carman42, J. Carvajal14, A. Celentano20, P. Chatagnon24, T. Chetry30, G. Ciullo18,13, L. Clark46, B. A. Clary9, P. L. Cole28,17, M. Contalbrigo18, R. Cruz-Torres29, A. D'Angelo21,38, N. Dashyan51, R. De Vita20, M. Defurne7, A. Deur42, S. Diehl9, C. Djalali34,40, M. Dugger2, R. Dupre24, H. Egiyan42, M. Ehrhart1, A. El Alaoui43, L. El Fassi30,1, P. Eugenio15, G. Fedotov39,§, R. Fersch8, A. Filippi22, G. Gavalian42,35, G. P. Gilfoyle37, F. X. Girod42,7, D. I. Glazier46, E. Golovatch39, R. W. Gothe40, K. A. Griffioen50, M. Guidal24, L. Guo14,42, K. Hafidi1, H. Hakobyan43,51, C. Hanretty42, N. Harrison42, M. Hattawy35, T. B. Hayward50, D. Heddle8,42, K. Hicks34, A. Hobart24, M. Holtrop32, Y. Ilieva40, I. Illari16, D. G. Ireland46, B. S. Ishkhanov39, E. L. Isupov39, D. Jenkins48, H. S. Jo27, K. Joo9, S. Joosten1,41, D. Keller49,34, M. Khachatryan35, A. Khanal14, M. Khandaker33,∥, A. Kim9, C. W. Kim16, W. Kim27, F. J. Klein6, V. Kubarovsky42, L. Lanza21, M. Leali45,23, P. Lenisa13,18, K. Livingston46, I. J. D. MacGregor46, D. Marchand24, N. Markov9, V. Mascagna44,23,¶, M. E. McCracken5, B. McKinnon46, C. A. Meyer5, Z. E. Meziani1,41, T. Mineeva43, V. Mokeev42, A. Movsisyan18, E. Munevar16,#, C. Munoz Camacho24, P. Nadel-Turonski42,6, S. Niccolai24, G. Niculescu26, T. O'Connell9, M. Osipenko20, A. I. Ostrovidov15, M. Paolone41, L. L. Pappalardo13,18, R. Paremuzyan32, E. Pasyuk42, W. Phelps8, O. Pogorelko31, J. Poudel35, J. W. Price3, Y. Prok35, D. Protopopescu46, B. A. Raue14,42, M. Ripani20, J. Ritman25, A. Rizzo21,38, G. Rosner46, J. Rowley34, F. Sabatié7, C. Salgado33, A. Schmidt29,**, R. A. Schumacher5, Y. G. Sharabian42, U. Shrestha34, Iu. Skorodumina40,39, D. Sokhan46, O. Soto19, N. Sparveris41, S. Stepanyan42, P. Stoler36, I. I. Strakovsky16, S. Strauch40, J. A. Tan27, N. Tyler40, M. Ungaro42,9, L. Venturelli45,23, H. Voskanyan51, E. Voutier24, D. P. Watts47, K. Wei9, X. Wei42, M. H. Wood4, N. Zachariou47, J. Zhang49,35, and Z. W. Zhao10,35 (CLAS Collaboration)

    • 1Argonne National Laboratory, Argonne, Illinois 60439, USA
    • 2Arizona State University, Tempe, Arizona 85287-1504, USA
    • 3California State University, Dominguez Hills, Carson, California 90747, USA
    • 4Canisius College, Buffalo, New York 14208, USA
    • 5Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
    • 6Catholic University of America, Washington, DC 20064, USA
    • 7IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
    • 8Christopher Newport University, Newport News, Virginia 23606, USA
    • 9University of Connecticut, Storrs, Connecticut 06269, USA
    • 10Duke University, Durham, North Carolina 27708-0305, USA
    • 11Duquesne University, Pittsburgh, Pennsylvania 15282, USA
    • 12Fairfield University, Fairfield, Connecticut 06824, USA
    • 13Università di Ferrara, 44121 Ferrara, Italy
    • 14Florida International University, Miami, Florida 33199, USA
    • 15Florida State University, Tallahassee, Florida 32306, USA
    • 16The George Washington University, Washington, DC 20052, USA
    • 17Idaho State University, Pocatello, Idaho 83209, USA
    • 18INFN, Sezione di Ferrara, 44100 Ferrara, Italy
    • 19INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy
    • 20INFN, Sezione di Genova, 16146 Genova, Italy
    • 21INFN, Sezione di Roma Tor Vergata, 00133 Rome, Italy
    • 22INFN, Sezione di Torino, 10125 Torino, Italy
    • 23INFN, Sezione di Pavia, 27100 Pavia, Italy
    • 24Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
    • 25Institute für Kernphysik, 52425 Jülich, Germany
    • 26James Madison University, Harrisonburg, Virginia 22807, USA
    • 27Kyungpook National University, Daegu 41566, Republic of Korea
    • 28Lamar University, 4400 MLK Blvd, P.O. Box 10009, Beaumont, Texas 77710, USA
    • 29Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
    • 30Mississippi State University, Mississippi State, Mississippi 39762-5167, USA
    • 31National Research Centre Kurchatov Institute-ITEP, Moscow, 117259, Russia
    • 32University of New Hampshire, Durham, New Hampshire 03824-3568, USA
    • 33Norfolk State University, Norfolk, Virginia 23504, USA
    • 34Ohio University, Athens, Ohio 45701, USA
    • 35Old Dominion University, Norfolk, Virginia 23529, USA
    • 36Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA
    • 37University of Richmond, Richmond, Virginia 23173, USA
    • 38Università di Roma Tor Vergata, 00133 Rome, Italy
    • 39Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, Russia
    • 40University of South Carolina, Columbia, South Carolina 29208, USA
    • 41Temple University, Philadelphia, Pennsylvania 19122, USA
    • 42Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
    • 43Universidad Técnica Federico Santa María, Casilla 110-V Valparaíso, Chile
    • 44Università degli Studi dell'Insubria, 22100 Como, Italy
    • 45Università degli Studi di Brescia, 25123 Brescia, Italy
    • 46University of Glasgow, Glasgow G12 8QQ, United Kingdom
    • 47University of York, York YO10 5DD, United Kingdom
    • 48Virginia Tech, Blacksburg, Virginia 24061-0435, USA
    • 49University of Virginia, Charlottesville, Virginia 22901, USA
    • 50College of William and Mary, Williamsburg, Virginia 23187-8795, USA
    • 51Yerevan Physics Institute, 375036 Yerevan, Armenia

    • *Present address: University of Virginia, Charlottesville, Virginia 22901, USA.
    • †crede@fsu.edu
    • ‡Present address: Mississippi State University, Mississippi State, Mississippi 39762-5167, USA.
    • §Present address: Ohio University, Athens, Ohio 45701, USA.
    • ∥Present address: Idaho State University, Pocatello, Idaho 83209, USA.
    • Present address: Università degli Studi di Brescia, 25123 Brescia, Italy.
    • #Present address: Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
    • **Present address: The George Washington University, Washington, DC 20052, USA.

    Phys. Rev. C 102, 065203 – Published 14 December, 2020

    DOI: https://doi.org/10.1103/PhysRevC.102.065203

    Abstract

    Photoproduction cross sections are reported for the reaction γp→pη using energy-tagged photons and the CLAS spectrometer at Jefferson Laboratory. The η mesons are detected in their dominant charged decay mode, η→π+π−π0, and results on differential cross sections are presented for incident photon energies between 1.2 and 4.7 GeV. These new η photoproduction data are consistent with earlier CLAS results but extend the energy range beyond the nucleon resonance region into the Regge regime. The normalized angular distributions are also compared with the experimental results from several other experiments, and with predictions of η-MAID 2018 and the latest solution of the Bonn-Gatchina coupled-channel analysis. Differential cross sections dσ/dt are presented for incident photon energies Eγ>2.9GeV (W>2.5GeV), and compared with predictions which are based on Regge trajectories exchange in the t-channel (Regge models). The data confirm the expected dominance of ρ, ω vector-meson exchange in an analysis by the Joint Physics Analysis Center.

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