Isospin breaking in $K \rightarrow \pi\pi$ decays
نویسندگان
چکیده
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 ...
متن کاملIsospin Breaking in B → K∗γ Decays
A calculation of the leading isospin-breaking contributions to the B → K∗γ decay amplitudes based on the QCD factorization approach is presented. They arise at order Λ/mb in the heavy-quark expansion and are due to annihilation contributions from 4-quark operators, the chromo-magnetic dipole operator, and charm penguins. In the Standard Model the decay rate for B̄0 → K̄∗0γ is predicted to be abou...
متن کاملIsospin Breaking in K → 3 π Decays I : Strong Isospin Breaking
The CP conserving amplitudes for the decays K → 3π are calculated in Chiral Perturbation Theory. The calculation is made at the next-to-leading order including strong and local electromagnetic isospin breaking. A comparison is made between the squared amplitudes with and without isospin violation to estimate the size of the effect. We find corrections of order five percent in the amplitudes.
متن کاملIsospin Breaking in K → 3π Decays II: Radiative Corrections
The five different CP conserving amplitudes for the decays K → 3π are calculated using Chiral Perturbation Theory. The calculation is made to next-to-leading order and includes full isospin breaking. The squared amplitudes are compared with the corresponding ones in the isospin limit to estimate the size of the isospin breaking effects. In this paper we add the radiative corrections to the earl...
متن کاملIsospin breaking in Kl4 decays
Data on Ke4 decays allow one to extract experimental information on the elastic ππ scattering amplitude near threshold, and to confront the outcome of the analysis with predictions made in the framework of QCD. These predictions concern an isospin symmetric world, while experiments are carried out in the real world, where isospin breaking effects – generated by electromagnetic interactions and ...
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ژورنال
عنوان ژورنال: The European Physical Journal C
سال: 2004
ISSN: 1434-6044,1434-6052
DOI: 10.1140/epjc/s2003-01579-3