Observation of the "k-pp " -like structure in the d (π+, K+) reaction at 1.69 GeV/ c

Yudai Ichikawa; Tomofumi Nagae; Hiroyuki Fujioka; Hyoungchan Bhang; Stefania Bufalino; Hiroyuki Ekawa; Petr Evtoukhovitch; Alessandro Feliciello; Shoichi Hasegawa; Shuhei Hayakawa; Ryotaro Honda; Kenji Hosomi; Ken'Ichi Imai; Shigeru Ishimoto; Changwoo Joo; Shunsuke Kanatsuki; Ryuta Kiuchi; Takeshi Koike; Harphool Kumawat; Yuki Matsumoto; Koji Miwa; Manabu Moritsu; Megumi Naruki; Masayuki Niiyama; Yuki Nozawa; Ryosuke Ota; Atsushi Sakaguchi; Hiroyuki Sako; Valentin Samoilov; Susumu Sato; Kotaro Shirotori; Hitoshi Sugimura; Shoji Suzuki; Toshiyuki Takahashi; Tomonori N. Takahashi; Hirokazu Tamura; Toshiyuki Tanaka; Kiyoshi Tanida; Atsushi O. Tokiyasu; Zviadi Tsamalaidze; Bidyut Roy; Mifuyu Ukai; Takeshi O. Yamamoto; Seongbae Yang

doi:10.1093/ptep/ptv002

Observation of the "k^-pp " -like structure in the d (π⁺, K⁺) reaction at 1.69 GeV/ c

Yudai Ichikawa, Tomofumi Nagae, Hiroyuki Fujioka, Hyoungchan Bhang, Stefania Bufalino, Hiroyuki Ekawa, Petr Evtoukhovitch, Alessandro Feliciello, Shoichi Hasegawa, Shuhei Hayakawa, Ryotaro Honda, Kenji Hosomi, Ken'Ichi Imai, Shigeru Ishimoto, Changwoo Joo, Shunsuke Kanatsuki, Ryuta Kiuchi, Takeshi Koike, Harphool Kumawat, Yuki MatsumotoKoji Miwa, Manabu Moritsu, Megumi Naruki, Masayuki Niiyama, Yuki Nozawa, Ryosuke Ota, Atsushi Sakaguchi, Hiroyuki Sako, Valentin Samoilov, Susumu Sato, Kotaro Shirotori, Hitoshi Sugimura, Shoji Suzuki, Toshiyuki Takahashi, Tomonori N. Takahashi, Hirokazu Tamura, Toshiyuki Tanaka, Kiyoshi Tanida, Atsushi O. Tokiyasu, Zviadi Tsamalaidze, Bidyut Roy, Mifuyu Ukai, Takeshi O. Yamamoto, Seongbae Yang

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

52 Citations (Scopus)

Abstract

We have observed a "K^-pp" -like structure in the d(π⁺,K⁺) reaction at 1.69 GeV/c. In this reaction, a Λ (1405) hyperon resonance is expected to be produced as a doorway to form K^-pp through the Λ ∗p→ K^-pp process. However, most of the Λ (1405) produced would escape from the deuteron without secondary reactions. Therefore, coincidence of high-momentum (>250MeV/c) proton(s) at large emission angles (39° < θ_lab. < 122°) was requested to enhance the signal-to-background ratio. A broad enhancement in the proton coincidence spectra is observed around the missing mass of 2.27 GeV/c², which corresponds to the K^-pp binding energy of 95⁺¹⁸_-17 (stat.) ⁺³⁰_-21 (syst.) MeV and the width of 162⁺⁸⁷_-45 (stat.) ⁺⁶⁶_-78 (syst.) MeV.

Original language	English
Article number	021D01
Journal	Progress of Theoretical and Experimental Physics
Volume	2015
Issue number	2
DOIs	https://doi.org/10.1093/ptep/ptv002
Publication status	Published - Jan 29 2015
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1093/ptep/ptv002

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Ichikawa, Y., Nagae, T., Fujioka, H., Bhang, H., Bufalino, S., Ekawa, H., Evtoukhovitch, P., Feliciello, A., Hasegawa, S., Hayakawa, S., Honda, R., Hosomi, K., Imai, KI., Ishimoto, S., Joo, C., Kanatsuki, S., Kiuchi, R., Koike, T., Kumawat, H., ... Yang, S. (2015). Observation of the "k^-pp " -like structure in the d (π⁺, K⁺) reaction at 1.69 GeV/ c. Progress of Theoretical and Experimental Physics, 2015(2), [021D01]. https://doi.org/10.1093/ptep/ptv002

Ichikawa, Y, Nagae, T, Fujioka, H, Bhang, H, Bufalino, S, Ekawa, H, Evtoukhovitch, P, Feliciello, A, Hasegawa, S, Hayakawa, S, Honda, R, Hosomi, K, Imai, KI, Ishimoto, S, Joo, C, Kanatsuki, S, Kiuchi, R, Koike, T, Kumawat, H, Matsumoto, Y, Miwa, K, Moritsu, M, Naruki, M, Niiyama, M, Nozawa, Y, Ota, R, Sakaguchi, A, Sako, H, Samoilov, V, Sato, S, Shirotori, K, Sugimura, H, Suzuki, S, Takahashi, T, Takahashi, TN, Tamura, H, Tanaka, T, Tanida, K, Tokiyasu, AO, Tsamalaidze, Z, Roy, B, Ukai, M, Yamamoto, TO & Yang, S 2015, 'Observation of the "k^-pp " -like structure in the d (π⁺, K⁺) reaction at 1.69 GeV/ c', Progress of Theoretical and Experimental Physics, vol. 2015, no. 2, 021D01. https://doi.org/10.1093/ptep/ptv002

@article{87797ebfc8aa45528178bffc1ce6367c,

title = "Observation of the {"}k-pp {"} -like structure in the d (π+, K+) reaction at 1.69 GeV/ c",

abstract = "We have observed a {"}K-pp{"} -like structure in the d(π+,K+) reaction at 1.69 GeV/c. In this reaction, a Λ (1405) hyperon resonance is expected to be produced as a doorway to form K-pp through the Λ ∗p→ K-pp process. However, most of the Λ (1405) produced would escape from the deuteron without secondary reactions. Therefore, coincidence of high-momentum (>250MeV/c) proton(s) at large emission angles (39° < θlab. < 122°) was requested to enhance the signal-to-background ratio. A broad enhancement in the proton coincidence spectra is observed around the missing mass of 2.27 GeV/c2, which corresponds to the K-pp binding energy of 95+18-17 (stat.) +30-21 (syst.) MeV and the width of 162+87-45 (stat.) +66-78 (syst.) MeV.",

author = "Yudai Ichikawa and Tomofumi Nagae and Hiroyuki Fujioka and Hyoungchan Bhang and Stefania Bufalino and Hiroyuki Ekawa and Petr Evtoukhovitch and Alessandro Feliciello and Shoichi Hasegawa and Shuhei Hayakawa and Ryotaro Honda and Kenji Hosomi and Ken'Ichi Imai and Shigeru Ishimoto and Changwoo Joo and Shunsuke Kanatsuki and Ryuta Kiuchi and Takeshi Koike and Harphool Kumawat and Yuki Matsumoto and Koji Miwa and Manabu Moritsu and Megumi Naruki and Masayuki Niiyama and Yuki Nozawa and Ryosuke Ota and Atsushi Sakaguchi and Hiroyuki Sako and Valentin Samoilov and Susumu Sato and Kotaro Shirotori and Hitoshi Sugimura and Shoji Suzuki and Toshiyuki Takahashi and Takahashi, {Tomonori N.} and Hirokazu Tamura and Toshiyuki Tanaka and Kiyoshi Tanida and Tokiyasu, {Atsushi O.} and Zviadi Tsamalaidze and Bidyut Roy and Mifuyu Ukai and Yamamoto, {Takeshi O.} and Seongbae Yang",

note = "Publisher Copyright: {\textcopyright} {\textcopyright} The Author(s) 2015. Published by Oxford University Press on behalf of the Physical Society of Japan.",

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doi = "10.1093/ptep/ptv002",

language = "English",

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T1 - Observation of the "k-pp " -like structure in the d (π+, K+) reaction at 1.69 GeV/ c

AU - Ichikawa, Yudai

AU - Nagae, Tomofumi

AU - Fujioka, Hiroyuki

AU - Bhang, Hyoungchan

AU - Bufalino, Stefania

AU - Ekawa, Hiroyuki

AU - Evtoukhovitch, Petr

AU - Feliciello, Alessandro

AU - Hasegawa, Shoichi

AU - Hayakawa, Shuhei

AU - Honda, Ryotaro

AU - Hosomi, Kenji

AU - Imai, Ken'Ichi

AU - Ishimoto, Shigeru

AU - Joo, Changwoo

AU - Kanatsuki, Shunsuke

AU - Kiuchi, Ryuta

AU - Koike, Takeshi

AU - Kumawat, Harphool

AU - Matsumoto, Yuki

AU - Miwa, Koji

AU - Moritsu, Manabu

AU - Naruki, Megumi

AU - Niiyama, Masayuki

AU - Nozawa, Yuki

AU - Ota, Ryosuke

AU - Sakaguchi, Atsushi

AU - Sako, Hiroyuki

AU - Samoilov, Valentin

AU - Sato, Susumu

AU - Shirotori, Kotaro

AU - Sugimura, Hitoshi

AU - Suzuki, Shoji

AU - Takahashi, Toshiyuki

AU - Takahashi, Tomonori N.

AU - Tamura, Hirokazu

AU - Tanaka, Toshiyuki

AU - Tanida, Kiyoshi

AU - Tokiyasu, Atsushi O.

AU - Tsamalaidze, Zviadi

AU - Roy, Bidyut

AU - Ukai, Mifuyu

AU - Yamamoto, Takeshi O.

AU - Yang, Seongbae

PY - 2015/1/29

Y1 - 2015/1/29

N2 - We have observed a "K-pp" -like structure in the d(π+,K+) reaction at 1.69 GeV/c. In this reaction, a Λ (1405) hyperon resonance is expected to be produced as a doorway to form K-pp through the Λ ∗p→ K-pp process. However, most of the Λ (1405) produced would escape from the deuteron without secondary reactions. Therefore, coincidence of high-momentum (>250MeV/c) proton(s) at large emission angles (39° < θlab. < 122°) was requested to enhance the signal-to-background ratio. A broad enhancement in the proton coincidence spectra is observed around the missing mass of 2.27 GeV/c2, which corresponds to the K-pp binding energy of 95+18-17 (stat.) +30-21 (syst.) MeV and the width of 162+87-45 (stat.) +66-78 (syst.) MeV.

AB - We have observed a "K-pp" -like structure in the d(π+,K+) reaction at 1.69 GeV/c. In this reaction, a Λ (1405) hyperon resonance is expected to be produced as a doorway to form K-pp through the Λ ∗p→ K-pp process. However, most of the Λ (1405) produced would escape from the deuteron without secondary reactions. Therefore, coincidence of high-momentum (>250MeV/c) proton(s) at large emission angles (39° < θlab. < 122°) was requested to enhance the signal-to-background ratio. A broad enhancement in the proton coincidence spectra is observed around the missing mass of 2.27 GeV/c2, which corresponds to the K-pp binding energy of 95+18-17 (stat.) +30-21 (syst.) MeV and the width of 162+87-45 (stat.) +66-78 (syst.) MeV.

UR - http://www.scopus.com/inward/record.url?scp=84928685928&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84928685928&partnerID=8YFLogxK

U2 - 10.1093/ptep/ptv002

DO - 10.1093/ptep/ptv002

M3 - Article

AN - SCOPUS:84928685928

VL - 2015

JO - Progress of Theoretical and Experimental Physics

JF - Progress of Theoretical and Experimental Physics

SN - 2050-3911

IS - 2

M1 - 021D01

ER -

Observation of the "k^-pp " -like structure in the d (π⁺, K⁺) reaction at 1.69 GeV/ c

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