Lambda(1405) production in the pi- p ---> K0 pi Sigma reaction

Hyodo, T.; Hosaka, A.; Oset, E.; Ramos, A.; Vicente Vacas, M.J.

doi:10.1103/PhysRevC.68.065203

Lambda(1405) production in the pi- p ---> K0 pi Sigma reaction

T. Hyodo
(
- Osaka U., Res. Ctr. Nucl. Phys.
)
,
A. Hosaka
(
- Osaka U., Res. Ctr. Nucl. Phys.
)
,
E. Oset
(
- Valencia U., IFIC
)
,
A. Ramos
(
- Barcelona U., ECM
)
,
M.J. Vicente Vacas
(
- Valencia U., IFIC
)

Jul, 2003

10 pages

Published in:

Phys.Rev.C 68 (2003) 065203

e-Print:

nucl-th/0307005 [nucl-th]

DOI:

10.1103/PhysRevC.68.065203

View in:

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Abstract:

We discuss the mechanisms that lead to

\Lambda(1405)

production in the

\pi^-p\to K^0\pi\Sigma

reaction. The problem has gained renewed interest after different works converge to the conclusion that there are two resonances around the region of 1400 MeV, rather than one, and that they couple differently to the

\pi\Sigma

and

\bar{K}N

channels. We look at the dynamics of that reaction and find two mechanisms which eventually filter each one of the resonances, leading to very different shapes of the

\pi\Sigma

invariant mass distributions. The combination of the two mechanisms leads to a shape of this distribution compatible with the experimental measurements.

12.39.Fe
14.20.Jn
13.75.-n
pi- p: inelastic scattering
Lambda(1405): hadroproduction
effective Lagrangian: chiral
unitarity
Feynman graph: higher-order
amplitude analysis
factorization

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