TY - JOUR
T1 - Pole position of Λ(1405) measured in d(K−,n)πΣ reactions
AU - J-PARC E31 Collaboration
AU - Aikawa, S.
AU - Ajimura, S.
AU - Akaishi, T.
AU - Asano, H.
AU - Beer, G.
AU - Berucci, C.
AU - Bragadireanu, M.
AU - Buehler, P.
AU - Busso, L.
AU - Cargnelli, M.
AU - Choi, S.
AU - Curceanu, C.
AU - Enomoto, S.
AU - Fujioka, H.
AU - Fujiwara, Y.
AU - Fukuda, T.
AU - Guaraldo, C.
AU - Hashimoto, T.
AU - Hayano, R. S.
AU - Hiraiwa, T.
AU - Iio, M.
AU - Iliescu, M.
AU - Inoue, K.
AU - Ishiguro, Y.
AU - Ishimoto, S.
AU - Ishikawa, T.
AU - Itahashi, K.
AU - Iwai, M.
AU - Iwasaki, M.
AU - Kanno, K.
AU - Kato, K.
AU - Kato, Y.
AU - Kawasaki, S.
AU - Kienle, P.
AU - Komatsu, Y.
AU - Kou, H.
AU - Ma, Y.
AU - Marton, J.
AU - Matsuda, Y.
AU - Mizoi, Y.
AU - Morra, O.
AU - Murayama, R.
AU - Nagae, T.
AU - Noumi, H.
AU - Ohnishi, H.
AU - Okada, S.
AU - Omar, Z.
AU - Outa, H.
AU - Piscicchia, K.
AU - Sada, Yuta
N1 - Funding Information:
The authors would like to express their thanks to the J-PARC PAC members and the crews of the J-PARC accelerator and hadron facility group for their encouragement, support, and stable delivery of beams for the E31 experiment. We are grateful to Professor D. Jido, Dr. T. Sekihara, and Professor J. Yamagata-Sekihara for their support since the planning stage of the E31 experiment. We are grateful to Professor K. Miyagawa and Dr. H. Kamano for their contributions to the calculations of the πΣ spectral shapes. The present work was supported by MEXT Grants-in-Aid of Innovative Area No. 21105003 , No. 18H05402 , and Grants-in-Aid of Scientific Research A No. 16H02188 and S No. 22H04940 .
Publisher Copyright:
© 2022 The Author
PY - 2023/2/10
Y1 - 2023/2/10
N2 - We measured a set of π±Σ∓, π0Σ0, and π−Σ0 invariant mass spectra below and above the K¯N mass threshold in K−-induced reactions on deuteron. The measured πΣ mass spectral shape is well reproduced via the two-step mechanism, i.e., a neutron knocked out at a forward angle from a deuteron by an incident K−, with the K¯ recoiled backward reacting with the residual nucleon to produce π and Σ. We deduced the S-wave K¯N→πΣ and K¯N→K¯N scattering amplitudes in the isospin 0 channel in the framework of a K¯N and πΣ coupled channel. We find that a resonance pole corresponding to Λ(1405) is located at 1417.7−7.4+6.0 (fitting errors)−1.0+1.1 (systematic errors) + [−26.1−7.9+6.0 (fitting errors)−2.0+1.7 (systematic errors)] i MeV/c2, closer to the K¯N mass threshold than the value determined by the Particle Data Group.
AB - We measured a set of π±Σ∓, π0Σ0, and π−Σ0 invariant mass spectra below and above the K¯N mass threshold in K−-induced reactions on deuteron. The measured πΣ mass spectral shape is well reproduced via the two-step mechanism, i.e., a neutron knocked out at a forward angle from a deuteron by an incident K−, with the K¯ recoiled backward reacting with the residual nucleon to produce π and Σ. We deduced the S-wave K¯N→πΣ and K¯N→K¯N scattering amplitudes in the isospin 0 channel in the framework of a K¯N and πΣ coupled channel. We find that a resonance pole corresponding to Λ(1405) is located at 1417.7−7.4+6.0 (fitting errors)−1.0+1.1 (systematic errors) + [−26.1−7.9+6.0 (fitting errors)−2.0+1.7 (systematic errors)] i MeV/c2, closer to the K¯N mass threshold than the value determined by the Particle Data Group.
KW - Hyperon resonance
KW - Kaon-nucleon interation
KW - Meson-baryon bound state
KW - Scattering amplitude
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U2 - 10.1016/j.physletb.2022.137637
DO - 10.1016/j.physletb.2022.137637
M3 - Article
AN - SCOPUS:85145399254
SN - 0370-2693
VL - 837
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
M1 - 137637
ER -