TY  - JOUR
AU  - Feijoo, A.
AU  - Valcarce Cadenas, V.
AU  - Magas, V. K.
PY  - 2023
DA  - 2023//
TI  - The Xi(1620) and Xi(1690) molecular states from S =-2 meson-baryon interaction up to next-to-leading order
T2  - Phys. Lett. B
JO  - Physics Letters B
SP  - 137927
EP  - 6pp
VL  - 841
PB  - Elsevier
KW  - Unitarized chiral perturbation theory
KW  - Meson-baryon interaction
KW  - Next-to-leading order
KW  - Doubly strange baryon
AB  - We have studied the meson-baryon interaction in the neutral S = -2 sector using an extended Unitarized Chiral Perturbation Theory, which takes into account not only the leading Weinberg-Tomozawa term (as all the previous studies in S = -2 sector), but also the Born terms and next-to-leading order contribution. Based on the SU(3) symmetry of the chiral Lagrangian we took most of the model parameters from the BCN model [1], where these were fitted to a large amount of experimental data in the neutral S = -1 sector. We have shown that our approach is able to generate dynamically both Xi(1620) and Xi(1690) states in very reasonable agreement with the data, and can naturally explain the puzzle with the decay branching ratios of Xi(1690). Our results clearly illustrate the reliability of chiral models implementing unitarization in coupled channels and the importance of considering Born and NLO contributions for precise calculations.
SN  - 0370-2693
UR  - https://arxiv.org/abs/2303.01323
UR  - https://doi.org/10.1016/j.physletb.2023.137927
DO  - 10.1016/j.physletb.2023.137927
LA  - English
N1  - WOS:000988654200001
ID  - Feijoo_etal2023
ER  -