Speaker
Fu-Jiun Jiang
(CTP, MIT)
Description
Using two-flavor chiral perturbation theories for hyperons, we study the
chiral corrections to the axial charges as well as the electromagnetic
properties of spin-1/2 hyperons. We first demonstrate that the virtual kaon
loop contributions are well described in the two-flavor theories by terms
analytic in the pion mass squared. We further show for the case of
experimentally known hyperon magnetic moments and charge radii, the chiral
corrections are under reasonable control, in contrast to the behavior
of these observables in the three-flavor chiral expansion.
Finally using lattice data and phenomenological inputs,
we verify that the convergence of chiral perturbation theory is improving
with increasing strangeness quantum number.
The formulae we derive are ideal for performing the pion mass
extrapolation of lattice QCD data obtained at the physical strange
quark mass.
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Primary author
Fu-Jiun Jiang
(CTP, MIT)
