N ov 2 00 3 Isospin Breaking in K l 4 Decays of the Neutral

ar X iv : h ep - p h / 03 11 27 4 v 1 2 1 N ov 2 00 3 Isospin Breaking in K l 4 Decays of the Charged Kaon

The charged K ℓ4 decay, K + → π + π − ℓ + ν ℓ is studied in the framework of chiral perturbation theory based on the effective Lagrangian including mesons, photons, and leptons. We give analytic expressions for the two vectorial form factors, f and g, calculated at one-loop level in the presence of Isospin breaking effects. These expressions may then be used to disentangle the Isospin breaking ...

2 v 1 3 0 N ov 2 00 0 TECHNION - PH - 2000 - 30 hep - ph / 0011392 November 2000 CKM Phases from

Measuring phases in the Cabibbo-Kobayashi-Maskawa matrix through CP asymmetries in B decays is a major goal of current and future experiments. Methods based on charge-conjugation and isospin symmetries involve very little theoretical uncertainties, while schemes based on flavor SU(3) involve uncertainties due to SU(3) breaking. Resolving these uncertainties requires further studies involving a ...

Further remarks on the isospin breaking in charmless semileptonic B decays

We consider the isospin breaking corrections to charmless semileptonic decays of B mesons. Both, the recently measured branching ratios of exclusive decays by the CLEO Collaboration and the end-point region of the inclusive lepton spectrum in form factor models, can be affected by these corrections. Isospin corrections can affect the determination of |Vub| from exclusive semileptonic B decays a...

N ov 2 00 6 Measurements of K e 4 and K ± → π 0 π 0 π ± decays

ar X iv : n uc l - th / 0 10 70 47 v 1 1 6 Ju l 2 00 1 LPNHE 2001 – 04 SLAC – PUB –

We study the way isospin symmetry violation can be generated within the Hidden Local Symmetry (HLS) Model. We show that isospin symmetry breaking effects on pseudoscalar mesons naturally induces correspondingly effects within the physics of vector mesons, through kaon loops. In this way, one recovers all features traditionally expected from ρ−ω mixing and one finds support for the Orsay phase m...