منابع مشابه
Isospin Breaking in K → ππ Decays ∗
We perform a complete analysis of isospin breaking in K → 2π amplitudes in chiral perturbation theory, including both strong isospin violation (m u = m d) and electromagnetic corrections to next-to-leading order in the low-energy expansion. The unknown chiral couplings are estimated at leading order in the 1/N c expansion. We study the impact of isospin breaking on CP conserving amplitudes and ...
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This talk contains a short overview of the history of the interplay of the weak and the strong interaction and CP -violation. It describes the phenomenology and the basic physics mechanisms involved in the Standard Model calculations of K → ππ decays with an emphasis on the evaluation of Penguin operator matrix-elements. a Presented at the Symposium and Workshop ”Continuous Advances in QCD 2002...
متن کاملSupersymmetric Explanation of CP Violation in K→ππ Decays.
Recent progress in the determination of hadronic matrix elements has revealed a tension between the measured value of ε_{K}^{'}/ε_{K}, which quantifies direct CP violation in K→ππ decays, and the standard-model prediction. The well-understood indirect CP violation encoded in the quantity ε_{K} typically precludes large new-physics contributions to ε_{K}^{'}/ε_{K} and challenges such an explanat...
متن کاملEffects in CP - even and CP - odd K → ππ Decays
Strong isospin-breaking (IB) effects in CP-even and CP-odd K → ππ decays are computed to next-to-leading order (NLO) in the chiral expansion. The impact of these corrections on the magnitude of the ∆I = 1/2 Rule and on the size of the IB correction, ΩIB, to the gluonic penguin contribution to ǫ /ǫ are discussed. In the presence of IB, the standard isospin decomposition of the K → ππ, K → ππ, ππ...
متن کاملK → ππ Decays in SU ( 2 ) Chiral Perturbation Theory
We study the decays K → ππ in one-loop two-flavour Chiral Perturbation Theory. We provide arguments why the calculation of the coefficient of the pionic chiral logarithm ℓ M = 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 lattic...
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ژورنال
عنوان ژورنال: Nuclear Physics A
سال: 2000
ISSN: 0375-9474
DOI: 10.1016/s0375-9474(99)00799-x