6533b82ffe1ef96bd1295ab4
RESEARCH PRODUCT
Higher-Order Corrections to Sirlin's Theorem inO(p6)Chiral Perturbation Theory
P. PostK. Schilchersubject
PhysicsParticle physicsPionChiral perturbation theoryGeneral Physics and AstronomyOrder (ring theory)Charge (physics)Linear combinationdescription
We present the results of the first two-loop calculation of a form factor in full $\mathrm{SU}(3)\ifmmode\times\else\texttimes\fi{}\mathrm{SU}(3)$ chiral perturbation theory. We choose a specific linear combination of ${\ensuremath{\pi}}^{+}$, ${K}^{+}$, ${K}^{0}$, and $K\ensuremath{\pi}$ form factors (the one appearing in Sirlin's theorem) which does not get contributions from order ${p}^{6}$ operators with unknown constants. For the charge radii, the corrections to the previous one-loop result turn out to be significant. To clearly identify the two-loop effects, more accurate measurements of the kaon and pion electromagnetic charge radii would be desirable.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1997-11-24 | Physical Review Letters |