Chiral perturbation theory, K to pi pi decays and 2+1 flavor domain wall QCD

Details Chiral perturbation theory, K to pi pi decays and 2+1 flavor domain wall QCD Chiral perturbation theory, K to pi pi decays and 2+1 flavor domain wall QCD

2008-12-07

arxiv.org/abs/0812.1368v1

PoS LATTICE2008:272,2008

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, PoS(LATTICE 2008)272

Scientific paper

We present a calculation of the low energy constants describing the real and imaginary parts of the $K \to \pi \pi$ decay amplitudes $A_0$ and $A_2$. Leading and next leading order chiral perturbation theory is used and its applicability assessed. A combination of statistical and systematic errors limits the precision of the results. The apparent limitations of chiral perturbation theory raise doubts about the accuracy of a possible extrapolation to physical $K \to \pi \pi$ kinematics.

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