Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-10-19
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages, 2 figures; talk presented at the 6th International Workshop on Chiral Dynamics, Bern, Switzerland, July 6-10, 2009
Scientific paper
We report on a recent study of the SU(3)-breaking corrections to the hyperon vector coupling $f_1(0)$ up to $\mathcal{O}(p^4)$ in covariant baryon chiral perturbation theory with dynamical octet and decuplet contributions. The decuplet contributions are taken into account for the first time in a covariant ChPT study and are found of similar or even larger size than the octet ones. We predict positive SU(3)-breaking corrections to all the four independent $f_1(0)$'s (assuming isospin symmetry), which are consistent, within uncertainties, with the latest results from large $N_c$ fits, chiral quark models, and quenched lattice QCD calculations. We also discuss briefly the implications of our results for the extraction of $V_{us}$ from hyperon decay data.
Camalich Martin J.
Geng Li Sheng
Vicente Vacas M. J.
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