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Nagoya University
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WG1 Precise Determination of Vud and Vus ckm2006WG1hepl.phys.nagoya-u.ac.jp
WG2 Determination of Vub and Vcb through Inclusive / Exclusive Semileptonic B decays ckm2006WG2hepl.phys.nagoya-u.ac.jp
WG3 Vtd / Vts through Mixings and Rare B and K Decays ckm2006WG3hepl.phys.nagoya-u.ac.jp
WG4 Angles from charmless B decays ckm2006WG4hepl.phys.nagoya-u.ac.jp
WG5 Angles from B decays with charm ckm2006WG5hepl.phys.nagoya-u.ac.jp
WG6 CKM Fits and New Physics ckm2006WG6hepl.phys.nagoya-u.ac.jp

       Working Groups    Proposed Workshop Format (PDF file)
WG1Precise Determination of Vud and Vus   
Conveners: Exp.:    E. Lucia     (Frascati),    M. Artuso (Syracuse)
Theory:    V. Cirigliano (CalTech),    T. Kaneko (KEK)

The main topic is the precise determination of the Cabibbo angle through the determination of the CKM elements Vud and Vus.
  • Determination of Vus .
    • from Kl3 decays: new Kl3 results, measurement and analysis of Kl3 Dalitz plot to constrain CHPT parameters, new lattice results and their errors
    • from τ and hyperon decays: estimate of theoretical errors, prospects
    • from fK / fπ : new lattice results, exhaustive estimate of unquenched lattice uncertainty

  • Determination of Vud from super-allowed Fermi transitions, neutron and pion decays: theoretical and experimental updates, also new idea.
  • Determination of Vcs, Vcd .
WG2:  Determination of Vub and Vcb through Inclusive / Exclusive Semileptonic B decays
Conveners: Exp.:    A. Limosani (KEK),    J. Dingfelder (SLAC)
Theory:    B. Lange    (MIT),    T. Onogi      (Kyoto)

The main goal of this group is the determination of Vub and Vcb through the inclusive and exclusive semileptonic B decays.
  • Determination of Vcb and HQE parameters from inclusive B ->Xlν decay .
    • Theoretical uncertainties: prospects .
    • Special moments: new results, averages, global fits, scheme differences, determination of quark masses and hadronic parameters and their combination.

  • Determination of Vub inclusive.
    • New measurements of Elepton , MX , q2 spectrum.
    • Methods to determine |Vub| from the measured rate, based on shape function scheme, weighting functions and DGE(Dressed Gluon Exponentiation) etc.
    • Associated theoretica;l errors. Weak annhilation effect.
    • How to make the average etc.

  • Determination of Vcb exclusive: theoretical and experimental update.
    • New measurements for the form factors.
    • F(1) lattice unquenched calculation, LCSR.

  • Determination of Vub exclusive: theoretical and experimental update.
    • New measurements of the q2 distribution with differenct tagging methods.
    • Experimental determination of the form factor shape.
    • Form factor normalization from unquenched lattice, LCSR and others.

  • Exclusive D semileptonic decays and form factors.
  • D -->πlν , extrapolation from D to B and possible determination of Vub.
WG3:  Vtd / Vts through Mixings and Rare B and K Decays   
Conveners: Exp.:    P. Chang     (NTU),    J. Kroll   (Penn)
Theory:    U. Haisch (Zurich/FNAL),    V. Lubicz  (Roma)

The main goal of this group is the determination of Vtd/Vts through meson mixing and rare B and K decays.
  • εK, ΔMd, ΔMs .
    • Lattice determination and experimental constraints on fBd , fBs and ξ.
    • Critical review on quenching and chiral logs associated errors.

  • B hadron widths and differences: theoretical and experimental update.
  • Measurement of Ds/D+ --> τ(μ)ν.
    • Determination of fDs, fD+ and their ratio.
    • Possible extrapolation to fB and ξ .

  • Vtd/Vts from B --> ργ and B--> K*γ .
    • New results from experiments.
    • Results from lattice, LCSR, prospects, long distance contributions.

  • Radiative decays as probe of CKM.
    • Theoretical and experimental updates of B--> Xs γ .
    • Use of b-->sγ for moments and for Vub ( discussion in conjunction with WG2).

  • Role of the radiative charm decays.
  • Rare K decays of relevance to CKM studies.
WG4:  Angles from charmless B decays   
Conveners: Exp.:    T. Gershon     (Warwick),    H. Ishino    (TIT)
Theory:    E. Kou (LPT, Orsay),    M. Ciuchini  (INFN)

The main goal is to study the measurements of the angles φ1, φ2, φ3, (or β, α, γ ) in charmless B decays. The limitations and ways to overcome them will be discussed, as well as new approaches and high statistics projections. We will concentrate on ways to estimate the SM uncertainties in all these modes and theoretical and experimental ways to reduce them.
  • φ2 (α) modes: two body decays (ππ), quasi-two-body (Q2B) Bdecays (ρρ, ρπ) and Dalitz analysis (πππ).
    • New results ? New modes ?
    • How can we get to φ2 (α) from the different measurements? How good is the Q2B approximation ? How important are S-wave contribution ( and other interference) in modes involving ρ ?
    • How trustable are theoretical calculations of the penguin pollution?

  • φ1 (β) modes: φK0, η'K0, f0K0, π0Ks, K+K-Ks, KsKsK0 and more.
    • New results ? New modes ?
    • Possible deviation from sin2φ1 (sin2β) within the SM ? What are the methods one can use to calculate them and how these methods can be checked?
    • Can the sign of the deviation be obtained ?
    • Are there correlations between the deviation in these modes ? Are there observables or combinations of observables that have smaller SM uncertainties (sums, ratios etc. ) ?

  • φ3 from charmless decays. Interpretation of other charmless decays.
    • Understanding of the πK modes (γ, electroweak penguins).
    • What can be learnt in addition from πK* and ρK* modes ?

  • Comparison and assessment of theoretical approaches based on factorization and/or flavor symmetries.
    • What are the theoretical assumptions?
    • Which amplitudes are included in the calculations, and what is the estimated theoretical error ?
    • Perform comparative studies for "benchmark" modes.
    • How predictive are data-driven fits ?
WG5:  Angles from B decays with charm   
Conveners: Exp.:    G. Cavoto (Rome),    K. Trabelsi  (KEK)
Theory:    J. Zupan   (CMU),    R. Fleischer  (CERN)

The main goal is the measurements of the angles φ3 (γ) and φ1 (β) from B decays involving D or Charmonium mesons. The limitations and ways to overcome them will be discussed, as well as new approaches and high statics projections.
  • Measurement of φ1 (β) in B decays to Charmonium.
    • Measurements of φ1 (β) and cos2φ1 (cos2β) .
    • CPT/T parameters.

  • Measurements of φ3 (γ) in B--> D(*)K(*) decays.
    • GLW and ADS methods.
    • Dalitz methods (model dependent/independent).

  • Measurements of 2φ1 + φ3 (2β + γ) in B--> D(*)π,ρ decays and related BF measurements (Dsπ, Dπ0, and D(*)K(*)).
WG6:  CKM Fits and New Physics   
Conveners: Exp.:    P. Koppenburg (London),    R. Itoh      (KEK)
Theory:    G. Isidori  (Frascati),    Y. Grossman  (Technion)

The main goals are global fits to the CKM parameters using different statistical methods., and search for, or constrain, the new physics contribution, using data from the B factories, Trvatron, and the future B facilities.
  • Global fit to Unitarity Triangle parameters using all the experimental and theoretical inputs from all the other WGs.
    • Comparison between direct and indirect determinations of different quantities, for instance, UT angles, hadronic parameters.
    • fB*|Vub| from B-->τν , |Vub/Vtd| from B--> τν and Δm .

  • Constraints to New Physics from
    • FCNC processes such as B--> Xs γ, Xs ll , Xs νν , K--> πνν etc.
    • B decays to final state with τ, such as B--> Dτν, τν .
    • Decays via Higgs mediation, such as Bs--> μ+ μ- .
    • Others.