Two of the elements of the Cabibbo-Kobayasha-Maskawa (CKM) quark mixing matrix, Vub and Vcb, are extracted from semi-leptonic B decays. The results of the B factories, analysed in the light of the most recent theoretical calculations, are puzzling. For both |Vcb| and |Vub| the exclusive determination is about 3σ below the inclusive one. This discrepancy has survived several independent checks and could be an indication for New Physics. Fortunately, the upcoming experiment Belle-II has the potential to resolve the issue in the first few years of operation after its start in 2015.
The goal of the proposed workshop is to help developing a medium term strategy of analyses and calculations aimed at the resolution of the puzzle. We plan to have lattice and continuum theorists working together with experimentalists to discuss how to reshape the semi-leptonic analyses in view of the much larger luminosity expected at Belle-II, searching for ways to systematically validate the theoretical predictions in both exclusive and inclusive B decays. We will also discuss the challenges and opportunities theoretical and experimental — of semileptonic Bs, Bc, and Λ b decays, motivated especially be the large samples already available at LHCb.
Conveners:
Andreas Kronfeld(Fermilab), DrChristoph Schwanda(Institute of High Energy Physics, Austrian Academy of Sciences), DrMarcello Rotondo(I.N.F.N. Padova), Paolo Gambino(University of Turin), Sascha Turczyk(University of Mainz)
09:00
Welcome and Information15m
Speakers:
Andreas Kronfeld(Fermilab), DrChristoph Schwanda(Institute of High Energy Physics, Austrian Academy of Sciences), DrMarcello Rotondo(I.N.F.N. Padova), Paolo Gambino(University of Turin), Sascha Turczyk(University of Mainz)
09:15
Information on Belle II-Theory interface Platform (B2TiP)20m
Speaker:
Shoji Hashimoto(KEK)
09:35
→
10:30
Vcb inclusive
09:35
Vcb inclusive: Where we stand30m
Speaker:
Paolo Gambino(University of Turin)
Slides
10:05
Higher Power Corrections25m
Speaker:
Sascha Turczyk(University of Mainz)
Slides
10:30
→
10:50
Break
10:50
→
12:00
Vcb inclusive
10:50
Lattice inputs on heavy quark masses25m
Speaker:
Andreas Kronfeld(Fermilab)
Slides
11:15
Future Prospects for moments measurements25m
Speaker:
DrChristoph Schwanda(Institute of High Energy Physics, Austrian Academy of Sciences)
Slides
11:40
Questions & Discussion20m
16:00
→
18:00
Discussions: Vcb inclusive
Conveners:
DrChristoph Schwanda(Institute of High Energy Physics, Austrian Academy of Sciences), Thomas Mannel(Siegen University)
Status and prospects of lattice FF for B->D tau nu and of B decay constant40m
Speaker:
Gregorio Herdoiza(IFT, Madrid)
Slides
09:40
Experimental issues of tau analyses at the B-Factories30m
Speaker:
Vera Luth(SLAC - Stanford University)
Slides
10:10
→
10:30
Break
10:30
→
12:00
Semileptonic and leptonic decays to tau
10:30
Exclusive decays with taus in final states @ LHCb30m
Speaker:
Greg Ciezarek(Nikhef)
Slides
11:00
Questions & Discussion1h
13:00
→
15:00
Final Discussion
Conveners:
Andreas Kronfeld(Fermilab), DrChristoph Schwanda(Institute of High Energy Physics, Austrian Academy of Sciences), DrMarcello Rotondo(I.N.F.N. Padova), Paolo Gambino(University of Turin), Sascha Turczyk(University of Mainz)
