Pole position of Λ(1405) measured in d(K−,n)πΣ reactions
(2023) In Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 837.- Abstract
- 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... (More)
- 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. © 2022 The Author (Less)
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- author
- Aikawa, S. ; Tatsuno, H. LU and Zmeskal, J.
- author collaboration
- organization
- publishing date
- 2023
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Hyperon resonance, Kaon-nucleon interation, Meson-baryon bound state, Scattering amplitude
- in
- Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
- volume
- 837
- article number
- 137637
- publisher
- Elsevier
- external identifiers
-
- scopus:85145399254
- ISSN
- 0370-2693
- DOI
- 10.1016/j.physletb.2022.137637
- language
- English
- LU publication?
- yes
- id
- f9588c31-68e9-4723-ac41-8345b07caa2b
- date added to LUP
- 2023-01-16 11:10:39
- date last changed
- 2023-11-20 17:20:24
@article{f9588c31-68e9-4723-ac41-8345b07caa2b,
abstract = {{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. © 2022 The Author}},
author = {{Aikawa, S. and Tatsuno, H. and Zmeskal, J.}},
issn = {{0370-2693}},
keywords = {{Hyperon resonance; Kaon-nucleon interation; Meson-baryon bound state; Scattering amplitude}},
language = {{eng}},
publisher = {{Elsevier}},
series = {{Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics}},
title = {{Pole position of Λ(1405) measured in d(K−,n)πΣ reactions}},
url = {{http://dx.doi.org/10.1016/j.physletb.2022.137637}},
doi = {{10.1016/j.physletb.2022.137637}},
volume = {{837}},
year = {{2023}},
}