PT Journal
AU Feijoo, A
   Valcarce Cadenas, V
   Magas, VK
TI The Xi(1620) and Xi(1690) molecular states from S =-2 meson-baryon interaction up to next-to-leading order
SO Physics Letters B
JI Phys. Lett. B
PY 2023
BP 137927
EP 6pp
VL 841
DI 10.1016/j.physletb.2023.137927
LA English
DE Unitarized chiral perturbation theory; Meson-baryon interaction; Next-to-leading order; 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.
ER