Título:
|
Spin, parity and nature of the Xi(1620) resonance
|
Autor/a:
|
Ramos Gómez, Àngels; Oset Baguena, Eulogio; Bennhold, Cornelius
|
Otros autores:
|
Universitat de Barcelona |
Abstract:
|
Using a unitary extension of chiral perturbation theory with a lowest-order
s
-wave SU(3) chiral Lagrangian we study low-energy meson-baryon scattering in the strangeness
S
=
−
2
sector. A scattering-matrix pole is found around 1605 MeV which corresponds to an
s
-wave
Ξ
resonance with
J
P
=
1
/
2
−
. We identify this resonance with the
Ξ
(
1620
)
state, quoted by the Particle Data Group with
I
=
1
/
2
but with unknown spin and parity. The addition of the
S
=
−
2
state to the recently computed
Λ
(
1670
)
,
Σ
(
1620
)
, and
N
(
1535
)
states completes the octet of
J
P
=
1
/
2
−
resonances dynamically generated in this chiral unitary approach. |
Materia(s):
|
-Partícules (Matèria) -Spin (Física nuclear) -Particles -Nuclear spin |
Derechos:
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(c) American Physical Society, 2002
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Tipo de documento:
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Artículo Artículo - Versión publicada |
Editor:
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American Physical Society
|
Compartir:
|
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