Measurement of KN scattering below the KN mass threshold

H. Noumi, Kentaro Inoue, Shingo Kawasaki, Shuu Aikawa, Shuhei Ajimura, Takaya Akaishi, Hidemitsu Asano, George Beer, C. Berucci, Mario Bragadireau

66 more authors

Paul Alois Buehler, Luigi Busso, M. Cargnelli, Seonho Choi, Catalina Curceanu, Shun Enomoto, Hiroyuki Fujioka, Yuya Fujiwara, Tomokazu Fukuda, C. Guaraldo, T. Hashimoto, R. Hayano, T. Hiraiwa, Iio M, M. Iliescu, Yusuke Ishiguro, S. Ishimoto, Takashi Ishikawa, Kenta Ithashi, Massaki Iwai, M. Iwasaki, Koki Kanno, Kazuma Kato, Yuko Kato, Paul Kienle, Yusuke Komatsu, Hiroshi Kou, Yue Ma, Johann Marton, Y. Matsuda, Y. Mizoi, Ombretta Morra, R. Murayama, T. Nagae, Hiroaki Ohnishi, S. Okada, Zhadyra Omar, Haruhiko Outa, Kristian Piscicchia, Y. Sada, A. Sakaguchi, F. Sakuma, Masaharu Sato, A. Scordo, M. Sekimoto, Hexi Shi, K. Shirotori, Diana Laura Sirghi, Florin Catalin Sirghi, Ken Suzuki, Shoji Suzuki, Takatoshi Suzuki, Kiyoshi Tanida, H. Tatsuno, A. O. Tokiyasu, Makoto Tokuda, Dai Tomono, A. Toyoda, K. Tsukada, O. Vázquez Doce, E. Widmann, Takumi Yamaga, Toshimitsu Yamazaki, Hee-Joong Yim, Qi Zhang, Johann Zmeskal

2024

Full text Open access: Gold Metadata (CSL-JSON)
DOI 10.1051/epjconf/202429105011
Data confidence 70 medium
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Abstract

Abstract. We measured πE invariant mass spectra below and above the K¯N mass threshold in the K−d → NπE reaction in order to study the K¯N interaction and the Λ(1405) resonance. This reaction can be described by the two-step process: (i) K¯N1 → K¯N followed by (ii) K¯N2 → πΣ, where N1 and N2 are nucleons bound in the deuteron. We deduced the S -wave scattering amplitude of K¯N →K¯N in the framework of the K¯N πΣ coupled channel so as to reproduce the observed πΣ spectra in the I = 0 channel. We found a resonance pole at 1417.7-7.4+6.0 (fitting error)-1.0+1.1 (systematic error) - i[26.9-7.9+6.0 (fitting error)-2.0+1.7 (systematic error)]MeV/c2.