First measurement of differential cross sections and photon beam asymmetries for photoproduction of the <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mi>f</mi><mn>0</mn></msub><mrow><mo>(</mo><mn>980</mn><mo>)</mo></mrow></mrow></math> meson decaying into <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msup><mi>π</mi><mn>0</mn></msup><msup><mi>π</mi><mn>0</mn></msup></mrow></math> at <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mi>E</mi><mi>γ</mi></msub><mo><</mo><mn>2.4</mn></mrow></math> GeV

LEPS2/BGOegg Collaboration; N. Muramatsu; S. K. Wang; Q. H. He; J. K. Ahn; W. C. Chang; J. Y. Chen; M. L. Chu; S. Daté; T. Gogami; H. Goto; H. Hamano; T. Hashimoto; K. Hicks; T. Hiraiwa; Y. Honda; T. Hotta; H. Ikuno; Y. Inoue; T. Ishikawa; I. Jaegle; J. M. Jo; Y. Kasamatsu; H. Katsuragawa; S. Kido; Y. Kon; S. Masumoto; Y. Matsumura; M. Miyabe; K. Mizutani; T. Nakamura; T. Nakano; T. Nam; M. Niiyama; Y. Nozawa; Y. Ohashi; H. Ohnishi; T. Ohta; M. Okabe; K. Ozawa; C. Rangacharyulu; S. Y. Ryu; Y. Sada; T. Shibukawa; H. Shimizu; R. Shirai; K. Shiraishi; E. A. Strokovsky; Y. Sugaya; M. Sumihama; S. Suzuki; S. Tanaka; Y. Taniguchi; A. Tokiyasu; N. Tomida; Y. Tsuchikawa; T. Ueda; T. F. Wang; H. Yamazaki; R. Yamazaki; Y. Yanai; T. Yorita; C. Yoshida; M. Yosoi

doi:10.1103/PhysRevC.107.L042201

Letter

First measurement of differential cross sections and photon beam asymmetries for photoproduction of the $f_{0} (980)$ meson decaying into $π^{0} π^{0}$ at $E_{γ} < 2.4$ GeV

N. Muramatsu ^1,2, S. K. Wang², Q. H. He², J. K. Ahn³, W. C. Chang⁴, J. Y. Chen⁵, M. L. Chu⁴, S. Daté^6,7, T. Gogami⁸ et al. (LEPS2/BGOegg Collaboration)

T. Gogami⁸, H. Goto⁷, H. Hamano⁷, T. Hashimoto⁷, K. Hicks⁹, T. Hiraiwa¹⁰, Y. Honda¹, T. Hotta⁷, H. Ikuno⁷, Y. Inoue¹, T. Ishikawa⁷, I. Jaegle¹¹, J. M. Jo³, Y. Kasamatsu⁷, H. Katsuragawa⁷, S. Kido¹, Y. Kon⁷, S. Masumoto¹², Y. Matsumura¹, M. Miyabe¹, K. Mizutani¹¹, T. Nakamura¹³, T. Nakano⁷, T. Nam¹⁴, M. Niiyama¹⁵, Y. Nozawa¹⁶, Y. Ohashi^6,7, H. Ohnishi¹, T. Ohta¹⁶, M. Okabe¹, K. Ozawa¹⁷, C. Rangacharyulu¹⁸, S. Y. Ryu⁷, Y. Sada¹, T. Shibukawa¹², H. Shimizu¹, R. Shirai¹, K. Shiraishi¹, E. A. Strokovsky^19,7, Y. Sugaya⁷, M. Sumihama^13,7, S. Suzuki⁶, S. Tanaka⁷, Y. Taniguchi¹, A. Tokiyasu¹, N. Tomida²⁰, Y. Tsuchikawa²¹, T. Ueda¹, T. F. Wang²², H. Yamazaki²³, R. Yamazaki¹, Y. Yanai⁷, T. Yorita⁷, C. Yoshida¹, and M. Yosoi⁷ (LEPS2/BGOegg Collaboration)

¹Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
²Department of Nuclear Science and Technology, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
³Department of Physics, Korea University, Seoul 02841, Republic of Korea
⁴Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
⁵National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
⁶Japan Synchrotron Radiation Research Institute (SPring-8), Sayo, Hyogo 679-5198, Japan
⁷Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
⁸Department of Physics, Kyoto University, Kyoto 606-8502, Japan
⁹Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA
¹⁰RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
¹¹Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
¹²Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
¹³Department of Education, Gifu University, Gifu 501-1193, Japan
¹⁴Dalat Nuclear Research Institute, Dalat, Lam Dong 66106, Vietnam
¹⁵Department of Physics, Kyoto Sangyo University, Kyoto 603-8555, Japan
¹⁶Department of Radiology, The University of Tokyo Hospital, Tokyo 113-8655, Japan
¹⁷Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
¹⁸Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon SK S7N 5E2, Canada
¹⁹Laboratory of High Energy Physics, Joint Institute for Nuclear Research, Dubna, Moscow Region, 142281, Russia
²⁰Center for Science Adventure and Collaborative Research Advancement (SACRA), Kyoto University, Kyoto 606-8502, Japan
²¹J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
²²School of Physics, Beihang University, Beijing 100191, China
²³Radiation Science Center, High Energy Accelerator Research Organization (KEK), Tokai, Ibaraki 319-1195, Japan

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Phys. Rev. C 107, L042201 – Published 7 April, 2023

DOI: https://doi.org/10.1103/PhysRevC.107.L042201

Abstract

For the first time, differential cross sections and photon beam asymmetries were measured for the reaction $γ p \to f_{0} (980) p \to π^{0} π^{0} p$ by using a linearly polarized photon beam up to $2.4 GeV$ and a liquid hydrogen target. The $f_{0}$ (980) photoproduction signal was clearly observed owing to the absence of contributions from vector-meson photoproduction. The results indicate the $t$ -channel exchange of vector mesons as a mechanism of the $f_{0} (980)$ photoproduction at $E_{γ} \approx 2.1 GeV$ , putting constraints on the nature of $f_{0} (980)$ .

Physical Review C

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First measurement of differential cross sections and photon beam asymmetries for photoproduction of the $f_{0} (980)$ meson decaying into $π^{0} π^{0}$ at $E_{γ} < 2.4$ GeV

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First measurement of differential cross sections and photon beam asymmetries for photoproduction of the f0(980) meson decaying into π0π0 at Eγ<2.4 GeV

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First measurement of differential cross sections and photon beam asymmetries for photoproduction of the $f_{0} (980)$ meson decaying into $π^{0} π^{0}$ at $E_{γ} < 2.4$ GeV