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.

doi:10.1016/j.physletb.2022.137637

Pole position of Λ(1405) measured in d(K−,n)πΣ reactions

J-PARC E31

Collaboration

•

S. Aikawa
(
- Tokyo Inst. Tech.
)

Sep 17, 2022

8 pages

Published in:

Phys.Lett.B 837 (2023) 137637

Published: Feb 10, 2023

e-Print:

2209.08254 [nucl-ex]

DOI:

10.1016/j.physletb.2022.137637 (publication)

PDG:

-2{\times }

IMAGINARY PART

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Abstract: (Elsevier B.V.)

We measured a set of

π^{\pm} Σ^{\mp}

,

π^{0} Σ^{0}

, and

π^{-} Σ^{0}

invariant mass spectra below and above the

\bar{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

\bar{K}

recoiled backward reacting with the residual nucleon to produce π and Σ. We deduced the S-wave

\bar{K} N \to π Σ

and

\bar{K} N \to \bar{K} N

scattering amplitudes in the isospin 0 channel in the framework of a

\bar{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/

c^{2}

, closer to the

\bar{K} N

mass threshold than the value determined by the Particle Data Group.

Note:

8 pages, 5 figures

Hyperon resonance
Meson-baryon bound state
Kaon-nucleon interation
Scattering amplitude
mass: threshold
resonance: pole
isospin: 0
Lambda(1405)
deuteron
mass spectrum

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