Working Groups Descriptions

This page describes briefly the 6 working groups and the physics topics that they cover. The list of all working group conveners is also available as a PDF file.

Each working group has a webpage and a mailing list, which is archived and visible to all subscribers on the web.

You should consider subscribing to your favorite, or even all, working groups.

It is the responsibility of the conveners to organize and create a webpage for their working group following the instructions on the Conveners page.

WG1: Determination of the Cabibbo angle

theory Gino Isidori (Frascati) Vittorio Lubicz (Roma-III)
exp Edward Blucher (Chicago) Erika de Lucia (Frascati)

The main topic is the precise determination of the Cabibbo angle through the determination of the CKM elements Vud and Vus

  1. Determination of Vus
    • from Kl3: 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
  2. Determination of Vud from super-allowed Fermi transitions, neutron and pion decays: theoretical and experimental updates
    • new ideas, for instance K+ → K0 l ν
  3. Determination of Vcs, Vcd

WG2: Determination of Vub and Vcb through Inclusive/Exclusive semileptonic B decays

theory Thomas Mannel (Siegen) Shoji Hashimoto (KEK)
exp Christoph Schwanda (Vienna) Robert Kowalewski (Victoria)

The main goal of this group is the determination of Vub and Vcb through the inclusive and exclusive semileptonic B decays

  1. determination of Vcb inclusive
    • Theoretical uncertainties: prospects
    • Spectral moments: new results, averages, global fits, scheme differences, determination of quark masses and hadronic parameters and their combination.
  2. inclusive charm semileptonic decays: comparison with OPE prediction, D/D*, duality violation, prospects
  3. determination of Vub inclusive
    • Shape function(s): combination with photon spectrum, theoretical errors, higher dimension operators
  4. determination of Vcb exclusive: theoretical and experimental update
    • F(1) lattice unquenched calculation, LCSR
    • discussion on errors
  5. determination of Vub exclusive: theoretical and experimental update
    • differential width as a function of q2
    • Form factors from Lattice in the region where lattice performs well. Role of LCSR
  6. B→τν
  7. 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

theory Mikolaj Misiak (Warsaw) Laurent Lellouch (Marseilles)
exp Jeffrey Berryhill (UCSB) Christoph Paus (MIT)

The main goal is determination of Vtd/Vts through meson mixing and rare and radiative decays

  1. εK, ΔMd, ΔMs.
    • Lattice determination and experimental constraints on FBd, FBs, and ζ
    • Critical review on quenching and chiral logs associated errors
  2. B hadron widths and differences: theoretical and experimental update
  3. Measurement of Ds/D+→τ(μ)ν
    • Determination of fDs, fD+ and their ratio
    • Possible extrapolation to FB and ζ
  4. Radiative decays as probe of CKM
    • theoretical and experimental updates of B→Xsγ
    • use of b→sγ for moments and for Vub (discussion in conjunction with WG2)
    • CP asymmetry
    • feasibility of B→Xdγ and the standard model predictions
  5. B→ργ and B→K*γ
    • Results from lattice, LCSR, prospects, long distance contributions
    • Role of the radiative charm decays. Bounds?
  6. B→Xsl+l-, theoretical and experimental updates, FB asymmetry
  7. Rare K decays of relevance to CKM studies
  8. K→πνν, charged and neutral (theortical and experimental updates)
  9. K→πll

WG4: Angles from charmless B decays

theory Martin Beneke (Aachen) Yuval Grossman (Technion/Boston)
exp Andreas Hoecker (Orsay) Masashi Hazumi (KEK)

The main goal is to study the measurements of the angles α (or equivalently γ) and β 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.

  1. α(γ) modes: two body decays (ππ), quasi-two-body (Q2B) B decays (ρρ ρπ) and Dalitz analyses (πππ).
    • Are there any "unused'' modes?
    • How can we get to 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 large are isospin breaking effects? Are there ways that these errors can be reduced?
    • How trustable are theoretical calculations of the penguin pollution?
  2. β modes: φK0, η'K0, f0K0, π0 KS, K+K-KS, KSKSK0 and more.
    • What are the SM prediction for the deviation from sin 2β in all these modes? That is, what are the methods one can use to calculate them and how these methods can be checked?
    • Are there other modes that one can use?
    • 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.) ?
  3. Interpretation of other charmless decays
    • Understanding of the πK modes (γ, electroweak penguins).
    • What can be learnt in addition from π K* and ρK* modes?
    • Polarization in B→VV modes
  4. Comparison and assessment of theoretical approaches based on factorization and/or flavour 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

theory Amarjit Soni (BNL) Robert Fleischer (CERN)
exp Timothy Gershon (KEK) Gianluca Cavoto (Roma I)

The main goal is the measurement of the angles γ and 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 statistics projections

  1. B decays to Charmonium
    • measurements of β and cos2β
    • CPT/T parameters
  2. Measurements of in B D(*)K(*) decays
    • GLW and ADS methods
    • Dalitz methods (model dependent/independent)
    • Measurements of 2β+γ in B→D(*)π,ρ decays and related BF measurements (Dsπ,Dπ0, and D(*)K(*))

WG6: CKM fits And New Physics

theory Luca Silvestrini (Roma I) Gudrun Hiller (Munich)
exp Heiko Lacker (Dresden) Gerhard Raven(Nikhef)

The main goals are global fits to the CKM parameters using different statistical methods and the new physics scenarios at the B factories, Tevatron, and the future B facilities.

  1. global fit to Unitarity Triangle parameters using all the experimental and theoretical inputs from all the other WGs
  2. comparison between direct and indirect determinations of different quantities, for instance UT angles, hadronic parameters. Importance of different quantities in defining the CKM parameters
  3. New Physics: experiment-oriented review of recent theoretical ideas in flavor physics; study of a few case scenarios (measurement of ΔMs and/or Bs→μ+μ- at Tevatron, b->s CP asymmetries at B factories, B→πK) in the global pre-LHC context; supersymmetric models: can we already draw some conclusion on the flavor structure?