Quark mixing and CP violation - the CKM matrix

Abstract

I present the status of the elements and parameters of the Cabibbo-Kobayashi-Maskawa (CKM) matrix and summarise the related theoretical progress since "Lepton-Photon 2003". One finds |V_{us}| = 0.2227 +/- 0.0017 from K and tau decays and |V_{cb}| = (41.6 +/- 0.5) * 10^{-3} from inclusive semileptonic B decays. The unitarity triangle can now be determined from tree-level quantities alone and the result agrees well with the global fit including flavour-changing neutral current (FCNC) processes, which are sensitive to new physics. From the global fit one finds the three CKM angles theta_{12}=12.9 +/- 0.1 degrees, theta_{23}= 2.38 +/- 0.03 degrees and theta_{13}= 0.223 +/- 0.007 degrees in the standard PDG convention. The CP phase equals delta_{13} = gamma = (58.8 +5.3/-5.8) degrees at 1 sigma CL and gamma=(58.8 +11.2/-15.4) degrees at 2 sigma CL. A major progress are first results from fully unquenched lattice QCD computations for the hadronic quantities entering the UT fit. I further present the calculation of three-loop QCD corrections to the charm contribution in K+ -> pi+ nu nu-bar decays, which removes the last relevant theoretical uncertainty from the K -> pi nu nu-bar system. Finally I discuss mixing-induced CP asymmetries in b -> s q-bar q penguin decays, whose naive average is below its Standard Model value by 3 sigma.

14 pages, 12 figures, plenary talk at "Lepton-Photon 2005"

References in corpus (19)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• CP Violation and the CKM Matrix: Assessing the Impact of the Asymmetric B Factories
• The B Meson Decay Constant from Unquenched Lattice QCD
• Theory of Charmless Inclusive B Decays and the Extraction of V_{ub}
• Global analysis of inclusive B decays
• Precision Measurements and CKM Unitarity
• V_us and m_s from hadronic tau decays
• Corrections to sin(2 beta) from CP asymmetries in B^0 -> (pi^0,rho^0,eta,eta^',omega,phi) K_S decays
• Subleading Shape Functions in Inclusive B Decays
• Improved Measurement of CP Asymmetries in B0 -> (ccbar)K0(*) Decays
• Factorization for Power Corrections to B->Xs gamma and B-> Xu e nu
• Radiative corrections in weak semi-leptoni processes at low energy: a two-step matching determination
• Measurement of the Strange Spectral Function in Hadronic tau Decays
• Measurement of the Inclusive Electron Spectrum in Charmless Semileptonic B Decays Near the Kinematic Endpoint and Determination of |Vub|
• Measurement of |V_ub| near the endpoint of the electron momentum spectrum from semileptonic B-meson decays
• Determination of |Vub| from Measurements of the Electron and Neutrino Momenta in Inclusive Semileptonic B Decays
• Radiative Corrections to K^0_{l3} Decays
• Results for light pseudoscalars from three-flavor simulations
• One-loop matching of Delta S=2 four-quark operators with improved staggered fermions

Cited by in corpus (6)

• Improved Measurement of cal{B}(D^+ --> mu^+ nu) and the Pseudoscalar Decay Constant f_{D^+}
• Charm Meson Decays
• Supersymmetric renormalisation of the CKM matrix and new constraints on the squark mass matrices
• Implications of unitarity and precision measurements on CKM matrix elements
• SU(3) and CP violating weak and strong final state phases for B_{d}^{0} and B_{s}^{0} decays
• D+ to mu+nu and fD+ from 281 pb-1 at Psi(3770) from CLEO-c