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Recent developments in SU(3) covariant baryon chiral perturbation theory
Baryon chiral perturbation theory has played and is still playing an important role in our understanding of low-energy strong-interaction physics. On the other hand, it has long been afflicted by the so-called power-counting-breaking problem and the slow convergence in the u, d, and s three-flavor sector. In the past few years, it has been shown that a covariant formulation of the baryon chiral perturbation theory supplemented with the extended-on-mass-shell scheme can solve both problems, at least partially.
Such a formulation has been applied with great success to study a number of physical observables of current interest, in connection to the LQCD simulations. In this talk, I will review some of the recent studies. In particular, I will focus on the light-quark mass evolution of the octet/decuplet baryon masses and the hyperon vector form vectors. The latter plays an indispensable role in the extraction of the CKM matrix element Vus from hyperon decay data.