# name
Spin, parity and nature of the Xi(1620) resonance

# metadata.dc.description.abstract[].value
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.

# metadata.dc.source[].value
Articles publicats en revistes (Física Quàntica i Astrofísica)

# metadata.dc.title[].value
Spin, parity and nature of the Xi(1620) resonance