Abstract

An experiment to search for the $K^{-}pp$ bound state was performed via the in-flight ${}^3{\rm He}(K^{-},n)$ reaction using $5.3 \times 10^9$ kaons at 1 GeV/$c$ at the J-PARC hadron experimental facility. In the semi-inclusive neutron missing-mass spectrum at $\theta _{n}^{lab}=0^\circ$, no significant peak was observed in the region corresponding to $K^{-}pp$ binding energy larger than 80 MeV, where a bump structure has been reported in the $\Lambda p$ final state in different reactions. Assuming the state to be isotropically decaying into $\Lambda p$, mass-dependent upper limits on the production cross section were determined to be 30–180, 70–250, and 100–270$\mu$b/sr, for the natural widths of 20, 60, and 100 MeV, respectively, at 95% confidence level.

Details

Title
Search for the deeply bound K–pp state from the semi-inclusive forward-neutron spectrum in the in-flight K– reaction on helium-3
Author
Hashimoto, T 1 ; Ajimura, S 2 ; Beer, G 3 ; Bhang, H 4 ; Bragadireanu, M 5 ; Busso, L 6 ; Cargnelli, M 7 ; Choi, S 4 ; Curceanu, C 8 ; Enomoto, S 2 ; Faso, D 6 ; Fujioka, H 9 ; Fujiwara, Y 1 ; Fukuda, T 10 ; Guaraldo, C 8 ; Hayano, R S 1 ; Hiraiwa, T 2 ; Iio, M 11 ; Iliescu, M 8 ; Inoue, K 12 ; Ishiguro, Y 9 ; Ishikawa, T 1 ; Ishimoto, S 11 ; Itahashi, K 13 ; Iwai, M 11 ; Iwasaki, M 14 ; Kato, Y 13 ; Kawasaki, S 12 ; Kienle, P 15 ; Kou, H 16 ; Y Ma 13 ; Marton, J 7 ; Matsuda, Y 17 ; Mizoi, Y 10 ; Morra, O 18 ; Nagae, T 9 ; Noumi, H 2 ; Ohnishi, H 19 ; Okada, S 13 ; Outa, H 13 ; Piscicchia, K 8 ; M Poli Lener 8 ; A Romero Vidal 8 ; Sada, Y 9 ; Sakaguchi, A 12 ; Sakuma, F 13 ; Sato, M 13 ; Scordo, A 8 ; Sekimoto, M 11 ; Shi, H 8 ; Sirghi, D 20 ; Sirghi, F 20 ; Suzuki, S 11 ; Suzuki, T 1 ; Tanida, K 4 ; Tatsuno, H 1 ; Tokuda, M 16 ; Tomono, D 9 ; Toyoda, A 11 ; Tsukada, K 21 ; O Vazquez Doce 22 ; Widmann, E 7 ; Yamaga, T 12 ; Yamazaki, T 23 ; Yim, H 24 ; Zhang, Q 13 ; Zmeskal, J 7 

1  Department of Physics, The University of Tokyo, Tokyo, 113-0033, Japan 
2  Research Center for Nuclear Physics (RCNP), Osaka University, Osaka, 567-0047, Japan 
3  Department of Physics and Astronomy, University of Victoria, Victoria BC V8W 3P6, Canada 
4  Department of Physics, Seoul National University, Seoul, 151-742, South Korea 
5  National Institute of Physics and Nuclear Engineering - IFIN HH, Romania 
6  INFN Sezione di Torino, Torino, Italy; Dipartimento di Fisica Generale, Universita’ di Torino, Torino, Italy 
7  Stefan-Meyer-Institut für subatomare Physik, A-1090 Vienna, Austria 
8  Laboratori Nazionali di Frascati dell’ INFN, I-00044 Frascati, Italy 
9  Department of Physics, Kyoto University, Kyoto, 606-8502, Japan 
10  Laboratory of Physics, Osaka Electro-Communication University, Osaka, 572-8530, Japan 
11  High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan 
12  Department of Physics, Osaka University, Osaka, 560-0043, Japan 
13  RIKEN Nishina Center, RIKEN, Wako, 351-0198, Japan 
14  RIKEN Nishina Center, RIKEN, Wako, 351-0198, Japan; Department of Physics, Tokyo Institute of Technology, Tokyo, 152-8551, Japan 
15  Technische Universität München, D-85748, Garching, Germany 
16  Department of Physics, Tokyo Institute of Technology, Tokyo, 152-8551, Japan 
17  Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, 153-8902, Japan 
18  INFN Sezione di Torino, Torino, Italy 
19  RIKEN Nishina Center, RIKEN, Wako, 351-0198, Japan; Research Center for Nuclear Physics (RCNP), Osaka University, Osaka, 567-0047, Japan 
20  Laboratori Nazionali di Frascati dell’ INFN, I-00044 Frascati, Italy; National Institute of Physics and Nuclear Engineering - IFIN HH, Romania 
21  Department of Physics, Tohoku University, Sendai, 980-8578, Japan 
22  Laboratori Nazionali di Frascati dell’ INFN, I-00044 Frascati, Italy; Excellence Cluster Universe, Technische Universität München, D-85748, Garching, Germany 
23  Department of Physics, The University of Tokyo, Tokyo, 113-0033, Japan; RIKEN Nishina Center, RIKEN, Wako, 351-0198, Japan 
24  Korea Institute of Radiological and Medical Sciences (KIRAMS), Seoul, 139-706, South Korea 
Publication year
2015
Publication date
Jun 2015
Publisher
Oxford University Press
e-ISSN
20503911
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1093/ptep/ptv076
ProQuest document ID
3171473613
Copyright
© The Author(s) 2015. Published by Oxford University Press on behalf of the Physical Society of Japan. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.