Physics Letters B (Feb 2019)
Non-strange dibaryons studied in the γd → π0π0d reaction
- T. Ishikawa,
- H. Fujimura,
- H. Fukasawa,
- R. Hashimoto,
- Q. He,
- Y. Honda,
- T. Iwata,
- S. Kaida,
- H. Kanda,
- J. Kasagi,
- A. Kawano,
- S. Kuwasaki,
- K. Maeda,
- S. Masumoto,
- M. Miyabe,
- F. Miyahara,
- K. Mochizuki,
- N. Muramatsu,
- A. Nakamura,
- K. Nawa,
- S. Ogushi,
- Y. Okada,
- K. Okamura,
- Y. Onodera,
- K. Ozawa,
- Y. Sakamoto,
- M. Sato,
- H. Shimizu,
- H. Sugai,
- K. Suzuki,
- Y. Tajima,
- S. Takahashi,
- Y. Taniguchi,
- Y. Tsuchikawa,
- H. Yamazaki,
- R. Yamazaki,
- H.Y. Yoshida
Affiliations
- T. Ishikawa
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan; Corresponding author.
- H. Fujimura
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- H. Fukasawa
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- R. Hashimoto
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- Q. He
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- Y. Honda
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- T. Iwata
- Department of Physics, Yamagata University, Yamagata 990-8560, Japan
- S. Kaida
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- H. Kanda
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
- J. Kasagi
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- A. Kawano
- Department of Information Science, Tohoku Gakuin University, Sendai 981-3193, Japan
- S. Kuwasaki
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- K. Maeda
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
- S. Masumoto
- Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
- M. Miyabe
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- F. Miyahara
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- K. Mochizuki
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- N. Muramatsu
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- A. Nakamura
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- K. Nawa
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- S. Ogushi
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- Y. Okada
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- K. Okamura
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- Y. Onodera
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- K. Ozawa
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
- Y. Sakamoto
- Department of Information Science, Tohoku Gakuin University, Sendai 981-3193, Japan
- M. Sato
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- H. Shimizu
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- H. Sugai
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- K. Suzuki
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- Y. Tajima
- Department of Physics, Yamagata University, Yamagata 990-8560, Japan
- S. Takahashi
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- Y. Taniguchi
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- Y. Tsuchikawa
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- H. Yamazaki
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- R. Yamazaki
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
- H.Y. Yoshida
- Department of Physics, Yamagata University, Yamagata 990-8560, Japan
- Journal volume & issue
-
Vol. 789
pp. 413 – 418
Abstract
Coherent double neutral-pion photoproduction on the deuteron, γd→π0π0d, has been experimentally studied at incident photon energies ranging from 0.75 to 1.15 GeV. The total cross section as a function of the γd center-of-mass energy shows resonance-like behavior, which peaks at approximately 2.47 and 2.63 GeV. The measured angular distribution of deuteron emission is rather flat, which cannot be reproduced by the kinematics of quasi-free π0π0 production with deuteron coalescence. In π0d invariant-mass distributions, a clear peak is observed at 2.14±0.01 GeV/c2 with a width of 0.09±0.01 GeV/c2. The spin-parity of this state is restricted to 1+, 2+ or 3− from the angular distributions of the two π0s. The present work shows strong evidence for the existence of an isovector dibaryon resonance with a mass of 2.14 GeV/c2. The 2+ assignment is consistent with the theoretically predicted D12 state, and also with the energy dependence of the πd partial-wave amplitude P23 for the π±d→π±d and π+d→pp reactions. Keywords: Coherent meson photoproduction, Dibaryon resonance
