Electromagnetic corrections toK→ππ.II. Dispersive matching
نویسندگان
چکیده
منابع مشابه
On power corrections in the dispersive approach
Power corrections in QCD (both conventional and unconventional ones arising from the ultraviolet region) are discussed within the infrared finite coupling-dispersive approach. It is shown how power corrections in Minkowskian quantities can be derived from the corresponding ones in associated Euclidean quantities through analyticity, allowing a parametrization in term of the Euclidean coupling a...
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The inclusion of electromagnetism in a low energy effective theory is worth further study in view of the present high precision experiments (muon g − 2, π0 → γγ, τ decays, etc.). In particular in many applications of chiral perturbation theory, one has to purify physical matrix elements from electromagnetic effects. The theoretical problems that I want to point out here are following: the split...
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متن کاملep - p h / 99 09 47 3 v 2 2 9 N ov 1 99 9 Electromagnetic Corrections to K → ππ II – Dispersive Matching
We express the leading electromagnetic corrections in K → ππ as integrals over the virtual photon squared-momentum Q. The high Q behavior is obtained via the operator product expansion. The low Q behavior is calculated using chiral perturbation theory. We model the intermediate Q region using resonance contributions in order to enforce the matching of these two regimes. Our results confirm our ...
متن کاملep - p h / 99 09 47 3 v 1 2 2 Se p 19 99 Electromagnetic Corrections to K → ππ II – Dispersive Matching
We express the leading electromagnetic corrections in K → ππ as integrals over the virtual photon squared-momentum Q. The high Q behavior is obtained via the operator product expansion. The low Q behavior is calculated using chiral perturbation theory. We model the intermediate Q region using resonance contributions in order to enforce the matching of these two regimes. Our results confirm our ...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2000
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.61.093002