Pole position of Λ(1405) measured in d(K−,n)πΣ reactions
Aikawa S. Ajimura S. Akaishi T. Asano H. Beer G. Berucci C. Bragadireanu M. Buehler P. Busso L. Cargnelli M. Choi S. Curceanu C. Enomoto S. Fujioka H. Fujiwara Y. Fukuda T. Guaraldo C. Hashimoto T. Hayano R.S. Hiraiwa T. Iio M. Iliescu M. Inoue K. Ishiguro Y. Ishimoto S. Ishikawa T. Itahashi K. Iwai M. Iwasaki M. Kanno K. Kato K. Kato Y. Kawasaki S. Kienle P. Komatsu Y. Kou H. Ma Y. Marton J. Matsuda Y. Mizoi Y. Morra O. Murayama R. Nagae T. Noumi H. Ohnishi H. Okada S. Omar Z. Outa H. Piscicchia K. Sada Y. Sakaguchi A. Sakuma F. Sato M. Scordo A. Sekimoto M. Shi H. Shirotori K. Sirghi D. Sirghi F. Suzuki K. Suzuki S. Suzuki T. Tanida K. Tatsuno H. Tokiyasu A.O. Tokuda M. Tomono D. Toyoda A. Tsukada K. Vazquez-Doce O. Widmann E. Yamaga T. Yamazaki T. Yim H. Zhang Q. Zmeskal J.
10 February 2023Elsevier B.V.
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
2023#837
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.
Hyperon resonance , Kaon-nucleon interation , Meson-baryon bound state , Scattering amplitude
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Department of Physics, Tokyo Institute of Technology, Tokyo, 152-0551, Japan
Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, 567-0047, Japan
Department of Physics, Osaka University, Toyonaka, 560-0043, Japan
RIKEN Cluster for Pioneering Research (CPR), RIKEN, Wako, 351-0198, Japan
Department of Physics and Astronomy, University of Victoria, Victoria, V8W 3P6, BC, Canada
Stefan-Meyer-Institut für subatomare Physik, Vienna, A-1030, Austria
Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH), Magurele, Romania
INFN Sezione di Torino, Torino, Italy
Dipartimento di Fisica Generale, Universitadi Torino, Torino, Italy
Department of Physics, Seoul National University, Seoul, 151-742, South Korea
Laboratori Nazionali di Frascati dellINFN, Frascati, I-00044, Italy
Accelerator Laboratory, High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan
Department of Physics, The University of Tokyo, Tokyo, 113-0033, Japan
Laboratory of Physics, Osaka Electro-Communication University, Neyagawa, 572-8530, Japan
RIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, 351-0198, Japan
ASRC, Japan Atomic Energy Agency (JAEA), Ibaraki, 319-1195, Japan
RIKEN SPring-8 Center, RIKEN, Hyogo, 679-5148, Japan
Cryogenics Science Center, High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan
Department of Physics, Kyoto University, Kyoto, 606-8502, Japan
Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan
Mechanical Engineering, Center, High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan
Technische Universität München, Garching, D-85748, Germany
Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, 153-8902, Japan
Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai, 982-0826, Japan
Department of Physics, Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”, Piazza del Viminale 1, Rome, 00184, Italy
INFN, Laboratori Nazionali di Frascati, Via Enrico Fermi 40, Frascati, 00044, Italy
Department of Chemical Physics, Lund University, Lund, 221 00, Sweden
Excellence Cluster University, Technische Universität München, Garching, D-85748, Germany
Korea Unstitute of Radiological and Medical Sciences (KIRAMS), Seoul, 139-706, South Korea
Department of Physics
Research Center for Nuclear Physics (RCNP)
Department of Physics
RIKEN Cluster for Pioneering Research (CPR)
Department of Physics and Astronomy
Stefan-Meyer-Institut für subatomare Physik
Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH)
INFN Sezione di Torino
Dipartimento di Fisica Generale
Department of Physics
Laboratori Nazionali di Frascati dellINFN
Accelerator Laboratory
Department of Physics
Laboratory of Physics
RIKEN Nishina Center for Accelerator-Based Science
ASRC
RIKEN SPring-8 Center
Cryogenics Science Center
Department of Physics
Institute of Particle and Nuclear Studies
Mechanical Engineering
Technische Universität München
Graduate School of Arts and Sciences
Research Center for Electron Photon Science (ELPH)
Department of Physics
Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”
INFN
Department of Chemical Physics
Excellence Cluster University
Korea Unstitute of Radiological and Medical Sciences (KIRAMS)
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