Non-strange dibaryons studied in coherent double neutral-meson photoproduction on the deuteron

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. NawaS. Ogushi, Y. Okada, 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

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Abstract

We have investigated the γd → π0π0d reaction to study dibaryon resonances. The total cross section as a function of the γd center-of-mass energy shows resonance-like behavior peaked at around 2.47 and 2.63 GeV. The measured angular distribution of deuteron emission is rather flat, which cannot be reproduced by kinematics for quasi-free π0π0 production with deuteron coalescence. A clear peak is observed at 2.14 GeV in the π0d invariant-mass distributions. The present work shows a sequential process γd → RIS → π0RIV → π0π0d is dominant with two 2.47- and 2.63-GeV isoscalar dibaryons (RIS) and a 2.14-GeV isovector dibaryon (RIV).

Original languageEnglish
Pages (from-to)329-332
Number of pages4
JournalActa Physica Polonica B
Volume51
Issue number1
DOIs
Publication statusPublished - 2020

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Ishikawa, T., Fujimura, H., Fukasawa, H., Hashimoto, R., He, Q., Honda, Y., Iwata, T., Kaida, S., Kanda, H., Kasagi, J., Kawano, A., Kuwasaki, S., Maeda, K., Masumoto, S., Miyabe, M., Miyahara, F., Mochizuki, K., Muramatsu, N., Nakamura, A., ... Yoshida, H. Y. (2020). Non-strange dibaryons studied in coherent double neutral-meson photoproduction on the deuteron. Acta Physica Polonica B, 51(1), 329-332. https://doi.org/10.5506/APhysPolB.51.329