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Spin, parity and nature of the Xi(1620) resonance
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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.
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Citació
RAMOS GÓMEZ, Àngels, OSET BAGUENA, Eulogio and BENNHOLD, Cornelius. Spin, parity and nature of the Xi(1620) resonance. Physical Review Letters. 2002. Vol. 89, num. 25, pags. 252001-1-252001-4. ISSN 0031-9007. [consulted: 6 of June of 2026]. Available at: https://hdl.handle.net/2445/12810