Resonance-like structure near the ηd threshold in the γd→π0ηd reaction

T. Ishikawa; H. Fujimura; H. Fukasawa; R. Hashimoto; Q. He; Y. Honda; T. Iwata; S. Kaida; J. Kasagi; A. Kawano; S. Kuwasaki; K. Maeda; S. Masumoto; M. Miyabe; F. Miyahara; K. Mochizuki; N. Muramatsu; A. Nakamura; K. Nawa; Y. Obara; S. Ogushi; Y. Okada; K. Okamura; Y. Onodera; K. Ozawa; Y. Sakamoto; M. Sato; Hajime Shimizu; Hiroyuki Sugai; K. Suzuki; Y. Tajima; S. Takahashi; Y. Taniguchi; Y. Tsuchikawa; Hirohito Yamazaki; R. Yamazaki; H. Y. Yoshida

doi:10.1103/PhysRevC.104.L052201

Resonance-like structure near the ηd threshold in the γd→π0ηd reaction

T. Ishikawa, H. Fujimura, H. Fukasawa, R. Hashimoto, Q. He, Y. Honda, T. Iwata, S. Kaida, J. Kasagi, A. Kawano, S. Kuwasaki, K. Maeda, S. Masumoto, M. Miyabe, F. Miyahara, K. Mochizuki, N. Muramatsu, A. Nakamura, K. Nawa, Y. ObaraS. Ogushi, Y. Okada, K. Okamura, Y. Onodera, K. Ozawa, Y. Sakamoto, M. Sato, Hajime Shimizu, Hiroyuki Sugai, K. Suzuki, Y. Tajima, S. Takahashi, Y. Taniguchi, Y. Tsuchikawa, Hirohito Yamazaki, R. Yamazaki, H. Y. Yoshida

Research Center for Electron Photon Science (ELPH)

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

To investigate the interaction between the nucleon N and nucleon resonance N(1535)1/2-, the ηd threshold structure connected to the isoscalar S-wave N-N(1535)1/2- system has been experimentally studied in the γd→π0ηd reaction at incident photon energies ranging from the reaction threshold to 1.15 GeV. A strong enhancement is observed near the ηd threshold over the three-body phase-space contribution in the ηd invariant-mass distribution. An analysis incorporating the known isovector resonance D12 with a spin parity of 2+ in the π0d channel reveals the existence of a narrow isoscalar resonance-like structure with 1- in the ηd system. Using a Flatté parametrization, the mass is found to be 2.427-0.006+0.013 GeV, close to the ηd threshold, and the width is (0.029-0.029+0.006GeV)+(0.00-0.00+0.41)pηc, where pη denotes the η momentum in the rest frame of the ηd system. The observed structure would be attributed to a predicted isoscalar 1-ηNN bound state from ηNN and πNN coupled-channel calculation, or an ηd virtual state owing to strong ηd attraction.

Original language	English
Article number	L052201
Journal	Physical Review C
Volume	104
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.104.L052201
Publication status	Published - 2021 Nov

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevC.104.L052201

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Ishikawa, T., Fujimura, H., Fukasawa, H., Hashimoto, R., He, Q., Honda, Y., Iwata, T., Kaida, S., Kasagi, J., Kawano, A., Kuwasaki, S., Maeda, K., Masumoto, S., Miyabe, M., Miyahara, F., Mochizuki, K., Muramatsu, N., Nakamura, A., Nawa, K., ... Yoshida, H. Y. (2021). Resonance-like structure near the ηd threshold in the γd→π0ηd reaction. Physical Review C, 104(5), [L052201]. https://doi.org/10.1103/PhysRevC.104.L052201

Ishikawa, T, Fujimura, H, Fukasawa, H, Hashimoto, R, He, Q, Honda, Y, Iwata, T, Kaida, S, Kasagi, J, Kawano, A, Kuwasaki, S, Maeda, K, Masumoto, S, Miyabe, M, Miyahara, F, Mochizuki, K, Muramatsu, N, Nakamura, A, Nawa, K, Obara, Y, Ogushi, S, Okada, Y, Okamura, K, Onodera, Y, Ozawa, K, Sakamoto, Y, Sato, M, Shimizu, H, Sugai, H, Suzuki, K, Tajima, Y, Takahashi, S, Taniguchi, Y, Tsuchikawa, Y, Yamazaki, H, Yamazaki, R & Yoshida, HY 2021, 'Resonance-like structure near the ηd threshold in the γd→π0ηd reaction', Physical Review C, vol. 104, no. 5, L052201. https://doi.org/10.1103/PhysRevC.104.L052201

@article{9dd5f5b08bc547c79a55cfe494fd276a,

title = "Resonance-like structure near the ηd threshold in the γd→π0ηd reaction",

abstract = "To investigate the interaction between the nucleon N and nucleon resonance N(1535)1/2-, the ηd threshold structure connected to the isoscalar S-wave N-N(1535)1/2- system has been experimentally studied in the γd→π0ηd reaction at incident photon energies ranging from the reaction threshold to 1.15 GeV. A strong enhancement is observed near the ηd threshold over the three-body phase-space contribution in the ηd invariant-mass distribution. An analysis incorporating the known isovector resonance D12 with a spin parity of 2+ in the π0d channel reveals the existence of a narrow isoscalar resonance-like structure with 1- in the ηd system. Using a Flatt{\'e} parametrization, the mass is found to be 2.427-0.006+0.013 GeV, close to the ηd threshold, and the width is (0.029-0.029+0.006GeV)+(0.00-0.00+0.41)pηc, where pη denotes the η momentum in the rest frame of the ηd system. The observed structure would be attributed to a predicted isoscalar 1-ηNN bound state from ηNN and πNN coupled-channel calculation, or an ηd virtual state owing to strong ηd attraction.",

author = "T. Ishikawa and H. Fujimura and H. Fukasawa and R. Hashimoto and Q. He and Y. Honda and T. Iwata and S. Kaida and J. Kasagi and A. Kawano and S. Kuwasaki and K. Maeda and S. Masumoto and M. Miyabe and F. Miyahara and K. Mochizuki and N. Muramatsu and A. Nakamura and K. Nawa and Y. Obara and S. Ogushi and Y. Okada and K. Okamura and Y. Onodera and K. Ozawa and Y. Sakamoto and M. Sato and Hajime Shimizu and Hiroyuki Sugai and K. Suzuki and Y. Tajima and S. Takahashi and Y. Taniguchi and Y. Tsuchikawa and Hirohito Yamazaki and R. Yamazaki and Yoshida, {H. Y.}",

note = "Funding Information: The authors express gratitude to the ELPH accelerator staff for stable operation of the accelerators in the FOREST experiments. They acknowledge Kazue Matsuda, Ken'ichi Nanbu, and Ikuro Nagasawa for their technical assistance in the FOREST experiments. They also thank Alexander I. Fix and Mikhail Egorov for their theoretical calculations and fruitful discussions. They are grateful for valuable discussions with Heinz A Clement, Atsushi Hosaka, Kiyoshi Tanida, and Hiroyuki Fujioka. They acknowledge Bernd Krusche for the numerical values of the total cross sections measured at the Mainz MAMI facility. This work was supported in part by the Ministry of Education, Culture, Sports, Science, and Technology, Japan (MEXT) and the Japan Society for the Promotion of Science (JSPS) through Grants-in-Aid for Specially Promoted Research No. 19002003, for Scientific Research (A) Nos. 24244022 and 16H02188, for Scientific Research (B) Nos. 17340063 and 19H01902, for Scientific Research (C) No. 26400287, and for Scientific Research on Innovative Areas Nos. 19H05141 and 19H05181. Publisher Copyright: {\textcopyright} 2021 American Physical Society.",

year = "2021",

month = nov,

doi = "10.1103/PhysRevC.104.L052201",

language = "English",

volume = "104",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "5",

}

TY - JOUR

T1 - Resonance-like structure near the ηd threshold in the γd→π0ηd reaction

AU - Ishikawa, T.

AU - Fujimura, H.

AU - Fukasawa, H.

AU - Hashimoto, R.

AU - He, Q.

AU - Honda, Y.

AU - Iwata, T.

AU - Kaida, S.

AU - Kasagi, J.

AU - Kawano, A.

AU - Kuwasaki, S.

AU - Maeda, K.

AU - Masumoto, S.

AU - Miyabe, M.

AU - Miyahara, F.

AU - Mochizuki, K.

AU - Muramatsu, N.

AU - Nakamura, A.

AU - Nawa, K.

AU - Obara, Y.

AU - Ogushi, S.

AU - Okada, Y.

AU - Okamura, K.

AU - Onodera, Y.

AU - Ozawa, K.

AU - Sakamoto, Y.

AU - Sato, M.

AU - Shimizu, Hajime

AU - Sugai, Hiroyuki

AU - Suzuki, K.

AU - Tajima, Y.

AU - Takahashi, S.

AU - Taniguchi, Y.

AU - Tsuchikawa, Y.

AU - Yamazaki, Hirohito

AU - Yamazaki, R.

AU - Yoshida, H. Y.

N1 - Funding Information: The authors express gratitude to the ELPH accelerator staff for stable operation of the accelerators in the FOREST experiments. They acknowledge Kazue Matsuda, Ken'ichi Nanbu, and Ikuro Nagasawa for their technical assistance in the FOREST experiments. They also thank Alexander I. Fix and Mikhail Egorov for their theoretical calculations and fruitful discussions. They are grateful for valuable discussions with Heinz A Clement, Atsushi Hosaka, Kiyoshi Tanida, and Hiroyuki Fujioka. They acknowledge Bernd Krusche for the numerical values of the total cross sections measured at the Mainz MAMI facility. This work was supported in part by the Ministry of Education, Culture, Sports, Science, and Technology, Japan (MEXT) and the Japan Society for the Promotion of Science (JSPS) through Grants-in-Aid for Specially Promoted Research No. 19002003, for Scientific Research (A) Nos. 24244022 and 16H02188, for Scientific Research (B) Nos. 17340063 and 19H01902, for Scientific Research (C) No. 26400287, and for Scientific Research on Innovative Areas Nos. 19H05141 and 19H05181. Publisher Copyright: © 2021 American Physical Society.

PY - 2021/11

Y1 - 2021/11

N2 - To investigate the interaction between the nucleon N and nucleon resonance N(1535)1/2-, the ηd threshold structure connected to the isoscalar S-wave N-N(1535)1/2- system has been experimentally studied in the γd→π0ηd reaction at incident photon energies ranging from the reaction threshold to 1.15 GeV. A strong enhancement is observed near the ηd threshold over the three-body phase-space contribution in the ηd invariant-mass distribution. An analysis incorporating the known isovector resonance D12 with a spin parity of 2+ in the π0d channel reveals the existence of a narrow isoscalar resonance-like structure with 1- in the ηd system. Using a Flatté parametrization, the mass is found to be 2.427-0.006+0.013 GeV, close to the ηd threshold, and the width is (0.029-0.029+0.006GeV)+(0.00-0.00+0.41)pηc, where pη denotes the η momentum in the rest frame of the ηd system. The observed structure would be attributed to a predicted isoscalar 1-ηNN bound state from ηNN and πNN coupled-channel calculation, or an ηd virtual state owing to strong ηd attraction.

AB - To investigate the interaction between the nucleon N and nucleon resonance N(1535)1/2-, the ηd threshold structure connected to the isoscalar S-wave N-N(1535)1/2- system has been experimentally studied in the γd→π0ηd reaction at incident photon energies ranging from the reaction threshold to 1.15 GeV. A strong enhancement is observed near the ηd threshold over the three-body phase-space contribution in the ηd invariant-mass distribution. An analysis incorporating the known isovector resonance D12 with a spin parity of 2+ in the π0d channel reveals the existence of a narrow isoscalar resonance-like structure with 1- in the ηd system. Using a Flatté parametrization, the mass is found to be 2.427-0.006+0.013 GeV, close to the ηd threshold, and the width is (0.029-0.029+0.006GeV)+(0.00-0.00+0.41)pηc, where pη denotes the η momentum in the rest frame of the ηd system. The observed structure would be attributed to a predicted isoscalar 1-ηNN bound state from ηNN and πNN coupled-channel calculation, or an ηd virtual state owing to strong ηd attraction.

UR - http://www.scopus.com/inward/record.url?scp=85120545112&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85120545112&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.104.L052201

DO - 10.1103/PhysRevC.104.L052201

M3 - Article

AN - SCOPUS:85120545112

SN - 2469-9985

VL - 104

JO - Physical Review C

JF - Physical Review C

IS - 5

M1 - L052201

ER -

Resonance-like structure near the ηd threshold in the γd→π0ηd reaction

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