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Structure near the K- + p + p threshold in the in-flight 3He(K-, Λp)n reaction

Sada, Y. ; Ajimura, S. ; Bazzi, Mohamad ; Beer, G. ; Bhang, H. ; Bragadireanu, M. ; Buehler, P. ; Busso, L. ; Cargnelli, M. and Choi, S , et al. (2016) In Progress of Theoretical and Experimental Physics 2016(5).
Abstract

To search for an S = -1 di-baryonic state which decays toΛp, the 3He(K-,Λp)nmissing reaction was studied at 1.0 GeV/c. Unobserved neutrons were kinematically identified from the missing mass MX of the 3He (K-,Λp) X reaction in order to have a large acceptance for the Λpn final state. The observed Λpn events, distributed widely over the kinematically allowed region of the Dalitz plot, establish that the major component comes from a three-nucleon absorption process. A concentration of events at a specific neutron kinetic energy was observed in a region of low momentum transfer to the Λp. To account for the observed peak structure, the simplest S-wave polewas assumed to exist in the... (More)

To search for an S = -1 di-baryonic state which decays toΛp, the 3He(K-,Λp)nmissing reaction was studied at 1.0 GeV/c. Unobserved neutrons were kinematically identified from the missing mass MX of the 3He (K-,Λp) X reaction in order to have a large acceptance for the Λpn final state. The observed Λpn events, distributed widely over the kinematically allowed region of the Dalitz plot, establish that the major component comes from a three-nucleon absorption process. A concentration of events at a specific neutron kinetic energy was observed in a region of low momentum transfer to the Λp. To account for the observed peak structure, the simplest S-wave polewas assumed to exist in the reaction channel, having a Breit-Wigner formin energy and with a Gaussian form factor. A minimum X2 method was applied to deduce its mass, MX = 2355+6 -8 (stat.) ±12 (syst.)MeV/c2, and decay width, γX = 110+19 -17 (stat.) ±27 (syst.)MeV/c2, respectively. The form factor parameter QX ∼ 400MeV/c implies that the range of the interaction is about 0.5 fm.

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publishing date
type
Contribution to journal
publication status
published
subject
in
Progress of Theoretical and Experimental Physics
volume
2016
issue
5
article number
051D01
publisher
Oxford University Press
external identifiers
  • scopus:84997207381
  • wos:000381226500001
ISSN
2050-3911
DOI
10.1093/ptep/ptw040
language
English
LU publication?
yes
id
5e5d7e0c-d8e9-49ed-b136-320c00f55ccb
date added to LUP
2017-04-19 13:16:11
date last changed
2025-04-16 01:14:35
@article{5e5d7e0c-d8e9-49ed-b136-320c00f55ccb,
  abstract     = {{<p>To search for an S = -1 di-baryonic state which decays toΛp, the <sup>3</sup>He(K<sup>-</sup>,Λp)nmissing reaction was studied at 1.0 GeV/c. Unobserved neutrons were kinematically identified from the missing mass M<sub>X</sub> of the <sup>3</sup>He (K<sup>-</sup>,Λp) X reaction in order to have a large acceptance for the Λpn final state. The observed Λpn events, distributed widely over the kinematically allowed region of the Dalitz plot, establish that the major component comes from a three-nucleon absorption process. A concentration of events at a specific neutron kinetic energy was observed in a region of low momentum transfer to the Λp. To account for the observed peak structure, the simplest S-wave polewas assumed to exist in the reaction channel, having a Breit-Wigner formin energy and with a Gaussian form factor. A minimum X<sup>2</sup> method was applied to deduce its mass, M<sub>X</sub> = 2355<sup>+6</sup> <sub>-8</sub> (stat.) ±12 (syst.)MeV/c<sup>2</sup>, and decay width, γ<sub>X</sub> = 110<sup>+19</sup> <sub>-17</sub> (stat.) ±27 (syst.)MeV/c<sup>2</sup>, respectively. The form factor parameter Q<sub>X</sub> ∼ 400MeV/c implies that the range of the interaction is about 0.5 fm.</p>}},
  author       = {{Sada, Y. and Ajimura, S. and Bazzi, Mohamad and Beer, G. and Bhang, H. and Bragadireanu, M. and Buehler, P. and Busso, L. and Cargnelli, M. and Choi, S and Curceanu, C. and Enomoto, S. and Faso, D. and Fujioka, H and Fujiwara, Yuuki and Fukuda, Tetsuya and Guaraldo, C. and Hashimoto, T. and Hayano, R. S. and Hiraiwa, T. and Iio, M. and Iliescu, M. and Inoue, K. and Ishiguro, Y. and Ishikawa, T. and Ishimoto, S. and Ishiwatari, T. and Itahashi, K and Iwai, M. and Iwasaki, M. and Kato, Y and Kawasaki, S. and Kienle, P. and Hong-Kou, Li and Ma, Y. and Marton, J. and Matsuda, Y. and Mizoi, Y. and Morra, O. and Nagae, T. and Noumi, H. and Ohnishi, H and Okada, S. and Outa, H. and Piscicchia, K. and Romero Vidal, A. and Sakaguchi, A and Sakuma, F. and Sato, Miyuki and Scordo, A. and Sekimoto, M and Shi, Hongqi and Sirghi, D. and Sirghi, F. and Suzuki, K. and Suzuki, S and Suzuki, T. and Tanida, K. and Tatsuno, H. and Tokuda, M. and Tomono, D. and Toyoda, A. and Tsukada, K. and Vazquez Doce, O. and Widmann, E. and Wuenschek, B. K. and Yamaga, Takumi and Yamazaki, T. and Yim, Seon-Hee and Zhang, Q. and Zmeskal, J.}},
  issn         = {{2050-3911}},
  language     = {{eng}},
  month        = {{05}},
  number       = {{5}},
  publisher    = {{Oxford University Press}},
  series       = {{Progress of Theoretical and Experimental Physics}},
  title        = {{Structure near the K<sup>-</sup> + p + p threshold in the in-flight <sup>3</sup>He(K<sup>-</sup>, Λp)n reaction}},
  url          = {{http://dx.doi.org/10.1093/ptep/ptw040}},
  doi          = {{10.1093/ptep/ptw040}},
  volume       = {{2016}},
  year         = {{2016}},
}