K to pi pi decays in SU(2) Chiral Perturbation Theory
Summary, in English
two-flavour Chiral Perturbation Theory.
We provide arguments why the calculation of the coefficient of the
pionic chiral logarithm
$\logm = M^2\log M^2$
is unique and then perform the calculation. As a check we perform the
reduction of the known three-flavour result.
Our result can be used to perform the extrapolation to the physical
pion mass of direct lattice QCD calculations of $K\to\pi\pi$
at fixed $m_s$ or $m_K^2$.
The underlying arguments
are expected to be valid for heavier particles and other processes as well.
- Theoretical Particle Physics
Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
- Subatomic Physics
- 11.30.Rd Chiral symmetries
- 12.39.Fe Chiral Lagrangians
- 13.20.Eb Decays of K mesons
- ISSN: 0370-2693