Physics Letters B (Feb 2019)
“K−pp”, a K‾-meson nuclear bound state, observed in 3He(K−,Λp)n reactions
- S. Ajimura,
- H. Asano,
- G. Beer,
- C. Berucci,
- H. Bhang,
- M. Bragadireanu,
- P. Buehler,
- L. Busso,
- M. Cargnelli,
- S. Choi,
- C. Curceanu,
- S. Enomoto,
- H. Fujioka,
- Y. Fujiwara,
- T. Fukuda,
- C. Guaraldo,
- T. Hashimoto,
- R.S. Hayano,
- T. Hiraiwa,
- M. Iio,
- M. Iliescu,
- K. Inoue,
- Y. Ishiguro,
- T. Ishikawa,
- S. Ishimoto,
- K. Itahashi,
- M. Iwasaki,
- K. Kanno,
- K. Kato,
- Y. Kato,
- S. Kawasaki,
- P. Kienle,
- H. Kou,
- Y. Ma,
- J. Marton,
- Y. Matsuda,
- Y. Mizoi,
- O. Morra,
- T. Nagae,
- H. Noumi,
- H. Ohnishi,
- S. Okada,
- H. Outa,
- K. Piscicchia,
- Y. Sada,
- A. Sakaguchi,
- F. Sakuma,
- M. Sato,
- A. Scordo,
- M. Sekimoto,
- H. Shi,
- K. Shirotori,
- D. Sirghi,
- F. Sirghi,
- K. Suzuki,
- S. Suzuki,
- T. Suzuki,
- K. Tanida,
- H. Tatsuno,
- M. Tokuda,
- D. Tomono,
- A. Toyoda,
- K. Tsukada,
- O. Vazquez Doce,
- E. Widmann,
- T. Yamaga,
- T. Yamazaki,
- Q. Zhang,
- J. Zmeskal
Affiliations
- S. Ajimura
- Osaka University, Osaka, 567-0047, Japan
- H. Asano
- RIKEN, Wako, 351-0198, Japan
- G. Beer
- University of Victoria, Victoria BC V8W 3P6, Canada
- C. Berucci
- Stefan-Meyer-Institut für subatomare Physik, A-1090 Vienna, Austria
- H. Bhang
- Seoul National University, Seoul, 151-742, South Korea
- M. Bragadireanu
- National Institute of Physics and Nuclear Engineering – IFIN HH, Bucharest, Magurele, Romania
- P. Buehler
- Stefan-Meyer-Institut für subatomare Physik, A-1090 Vienna, Austria
- L. Busso
- INFN Sezione di Torino, 10125 Torino, Italy; Universita' di Torino, Torino, Italy
- M. Cargnelli
- Stefan-Meyer-Institut für subatomare Physik, A-1090 Vienna, Austria
- S. Choi
- Seoul National University, Seoul, 151-742, South Korea
- C. Curceanu
- Laboratori Nazionali di Frascati dell' INFN, I-00044 Frascati, Italy
- S. Enomoto
- High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan
- H. Fujioka
- Tokyo Institute of Technology, Tokyo, 152-8551, Japan
- Y. Fujiwara
- The University of Tokyo, Tokyo, 113-0033, Japan
- T. Fukuda
- Osaka Electro-Communication University, Osaka, 572-8530, Japan
- C. Guaraldo
- Laboratori Nazionali di Frascati dell' INFN, I-00044 Frascati, Italy
- T. Hashimoto
- Japan Atomic Energy Agency, Ibaraki 319-1195, Japan
- R.S. Hayano
- The University of Tokyo, Tokyo, 113-0033, Japan
- T. Hiraiwa
- Osaka University, Osaka, 567-0047, Japan
- M. Iio
- High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan
- M. Iliescu
- Laboratori Nazionali di Frascati dell' INFN, I-00044 Frascati, Italy
- K. Inoue
- Osaka University, Osaka, 567-0047, Japan
- Y. Ishiguro
- Kyoto University, Kyoto, 606-8502, Japan
- T. Ishikawa
- The University of Tokyo, Tokyo, 113-0033, Japan
- S. Ishimoto
- High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan
- K. Itahashi
- RIKEN, Wako, 351-0198, Japan
- M. Iwasaki
- RIKEN, Wako, 351-0198, Japan; Tokyo Institute of Technology, Tokyo, 152-8551, Japan; Corresponding authors at: RIKEN, Wako, 351-0198, Japan.
- K. Kanno
- The University of Tokyo, Tokyo, 113-0033, Japan
- K. Kato
- Kyoto University, Kyoto, 606-8502, Japan
- Y. Kato
- RIKEN, Wako, 351-0198, Japan
- S. Kawasaki
- Osaka University, Osaka, 567-0047, Japan
- P. Kienle
- Technische Universität München, D-85748, Garching, Germany
- H. Kou
- Tokyo Institute of Technology, Tokyo, 152-8551, Japan
- Y. Ma
- RIKEN, Wako, 351-0198, Japan
- J. Marton
- Stefan-Meyer-Institut für subatomare Physik, A-1090 Vienna, Austria
- Y. Matsuda
- The University of Tokyo, Tokyo, 113-0033, Japan
- Y. Mizoi
- Osaka Electro-Communication University, Osaka, 572-8530, Japan
- O. Morra
- INFN Sezione di Torino, 10125 Torino, Italy
- T. Nagae
- Kyoto University, Kyoto, 606-8502, Japan
- H. Noumi
- Osaka University, Osaka, 567-0047, Japan
- H. Ohnishi
- Tohoku University, Sendai, 982-0826, Japan; RIKEN, Wako, 351-0198, Japan
- S. Okada
- RIKEN, Wako, 351-0198, Japan
- H. Outa
- RIKEN, Wako, 351-0198, Japan
- K. Piscicchia
- Laboratori Nazionali di Frascati dell' INFN, I-00044 Frascati, Italy
- Y. Sada
- Osaka University, Osaka, 567-0047, Japan
- A. Sakaguchi
- Osaka University, Osaka, 567-0047, Japan
- F. Sakuma
- RIKEN, Wako, 351-0198, Japan; Corresponding authors at: RIKEN, Wako, 351-0198, Japan.
- M. Sato
- High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan
- A. Scordo
- Laboratori Nazionali di Frascati dell' INFN, I-00044 Frascati, Italy
- M. Sekimoto
- High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan
- H. Shi
- Laboratori Nazionali di Frascati dell' INFN, I-00044 Frascati, Italy
- K. Shirotori
- Osaka University, Osaka, 567-0047, Japan
- D. Sirghi
- Laboratori Nazionali di Frascati dell' INFN, I-00044 Frascati, Italy; National Institute of Physics and Nuclear Engineering – IFIN HH, Bucharest, Magurele, Romania
- F. Sirghi
- Laboratori Nazionali di Frascati dell' INFN, I-00044 Frascati, Italy; National Institute of Physics and Nuclear Engineering – IFIN HH, Bucharest, Magurele, Romania
- K. Suzuki
- Stefan-Meyer-Institut für subatomare Physik, A-1090 Vienna, Austria
- S. Suzuki
- High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan
- T. Suzuki
- The University of Tokyo, Tokyo, 113-0033, Japan
- K. Tanida
- Japan Atomic Energy Agency, Ibaraki 319-1195, Japan
- H. Tatsuno
- Lund University, Lund, 221 00, Sweden
- M. Tokuda
- Tokyo Institute of Technology, Tokyo, 152-8551, Japan
- D. Tomono
- Osaka University, Osaka, 567-0047, Japan
- A. Toyoda
- High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan
- K. Tsukada
- Tohoku University, Sendai, 982-0826, Japan
- O. Vazquez Doce
- Laboratori Nazionali di Frascati dell' INFN, I-00044 Frascati, Italy; Technische Universität München, D-85748, Garching, Germany
- E. Widmann
- Stefan-Meyer-Institut für subatomare Physik, A-1090 Vienna, Austria
- T. Yamaga
- RIKEN, Wako, 351-0198, Japan; Osaka University, Osaka, 567-0047, Japan; Corresponding authors at: RIKEN, Wako, 351-0198, Japan.
- T. Yamazaki
- The University of Tokyo, Tokyo, 113-0033, Japan; RIKEN, Wako, 351-0198, Japan
- Q. Zhang
- RIKEN, Wako, 351-0198, Japan
- J. Zmeskal
- Stefan-Meyer-Institut für subatomare Physik, A-1090 Vienna, Austria
- Journal volume & issue
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Vol. 789
pp. 620 – 625
Abstract
We observed a distinct peak in the Λp invariant mass spectrum of He3(K−,Λp)n, well below mK+2mp, i.e., the mass threshold of the K− to be bound to two protons. By selecting a relatively large momentum-transfer region q=350∼650 MeV/c, one can kinematically separate the peak from the quasi-free process, K‾N→K‾N followed by the non-resonant absorption by the two spectator-nucleons K‾NN→ΛN. We found that the simplest fit to the observed peak gives us a Breit–Wigner pole position at BKpp=47±3(stat.)−6+3(sys.) MeV having a width ΓKpp=115±7(stat.)−20+10(sys.) MeV, and the S-wave Gaussian reaction form-factor parameter QKpp=381±14(stat.)−0+57(sys.) MeV/c, as a new form of the nuclear bound system with strangeness – “K−pp”. Keywords: Kaon, Strangeness, Mesonic nuclear bound state
