Chiral Perturbation Theory at Two Loops and the Measurement of $V_{us}$

Details Chiral Perturbation Theory at Two Loops and the Measurement of $V_{us}$ Chiral Perturbation Theory at Two Loops and the Measurement of $V_{us}$

2003-04-30

arxiv.org/abs/hep-ph/0304284v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, talk given at 38th Rencontres de Moriond on QCD and High-Energy Hadronic Interactions, Les Arcs, Savoie, France, 22-2

Scientific paper

I give an overview of the calculations done in three-flavour Chiral
perturbation theory at next-to-next-to-leading order with an emphasis on those
relevant for an improvement in the accuracy of the measurement of $V_{us}$. It
is pointed out that all needed low energy constants can be obtained from
experiment via the scalar form-factor in $K_{\ell3}$ decays

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