3 decays and CKM unitarity *

CKM Matrix : Present and Future a

We review the present status of the CKM matrix and we offer some visions of its future. After a brief presentation of the theoretical framework for weak decays we discuss the following topics: i) CKM matrix from tree level decays, ii) Standard analysis of the unitarity triangle, iii) CKM matrix from rare and CP violating Kand B-decays, iv) CKM matrix from CP violation in twobody B-decays. In pa...

Hyperon Semileptonic Decays and Ckm Unitarity *

We perform a new numerical analysis of hyperon semileptonic decays emphasizing the systematic uncertainties. The poor understanding of SU(3) symmetry breaking effects at second order in the vector form factor translates into a large error of |Vus|. Using our determination |Vus| = 0.226 ± 0.005 together with those coming from other sources we test the unitarity of the CKM matrix.

Implications of CKM Unitarity

Three generation CKM Unitarity in the Standard Model predicts |Vud |2 + |Vus| + |Vub| = 1. Nuclear, K`3 and b → u decays currently give |Vud |2 + |Vus| + |Vub| = 0.9991(8). The good agreement between theory and experiment can be used to constrain “new physics” effects at the tree and quantum loop level. Examples considered are: exotic muon decays, heavy quark or lepton mixing, high scale induce...

3 Decays : Radiative Corrections and Ckm Unitarity

Implication of the B → ( ρ , ω ) γ Branching Ratios for the CKM Phenomenology

We study the implication of the recent measurement by the BELLE collaboration of the averaged branching fraction B̄exp[B → (ρ, ω) γ] = (1.8 −0.5 ± 0.1)× 10 for the CKM phenomenology. Combined with the averaged branching fraction B̄exp(B → K γ) = (4.06±0.26)×10−5 measured earlier, this yields R̄exp[(ρ, ω) γ/Kγ] = (4.2±1.3)% for the ratio of the two branching fractions. Updating earlier theoretical ...

ar X iv : h ep - p h / 05 10 17 7 v 2 3 N ov 2 00 5 Hyperon Semileptonic Decays and CKM Unitarity ∗

We perform a new numerical analysis of hyperon semileptonic decays emphasizing the systematic uncertainties. The poor understanding of SU(3) symmetry breaking effects at second order in the vector form factor translates into a large error of |Vus|. Using our determination |Vus| = 0.226 ± 0.005 together with those coming from other sources we test the unitarity of the CKM matrix.