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Theoretical-Experimental Workshop Summary: Selected Questions & Collaborative Points

A comprehensive list of questions selected by workshop organizers for ongoing discussions and collaborations between theorists and experimentalists. The points raised cover topics such as form factor determinations, precision measurements, theoretical interests, and parametrization issues in various decays. The aim is to enhance the understanding and collaboration between the two groups. Gratitude to the participants and facilitators for their valuable contributions.

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Theoretical-Experimental Workshop Summary: Selected Questions & Collaborative Points

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  1. Workshop Summary as list of questions selected by the organisers (Jochen,Paul,Tom,Achille) ~40 listed questions Many thanks to the speakers : Art Snyder, Vera Luth, Justine Serrano, Richard Hill, Paul MacKenzie, Damir Becirevic, Karsten Koeneke, Paul Jackson, Shoji Hashimoto, Christine Davies, Vittorio Lubicz, Denis Bernard, Estia Eichten • Many points have been raised. We have to • digest them ! • -List of questions is growing… • -Discussions will go on after the meeting and we • hope this workshop has also served for • continuing fruitful collaborations between • theorists and experimentalists Thanks to the participants and especially to theorists which come for the Workshop. List of points we put down to continue the discussion

  2. B exclusive to D : Vcb Babar has the most precise Form factor determination for D* • Useful to further improve the D* ff ? • * Is there theoretical interest on D** ? * F(1) in D* and D room from improvements (today +-3% on 10% difference from 1) ? * Useful to calculate r2 on Lattice ? Useful for experiment or just a check for Lattice ? Comments : Measurements with p,h,r available and will be improved. Possibility to split on many q2 bins B exclusive to u : Vub We want exclusive reach the same precision quoted for inclusive B u decays. * Bhln vs pln useful ? (h,h’ mixing) related question on charm sector) from experiment (background) ? (related question on charm sector) * Which is the optimal q2 region ? from Lattice ? (how to estimate the error on the extrapolation ?) * Br l n (r is not stable). Effect of the width is relevant ? B  wln * Parametrization issue (param. in terms of z) (see related question on charm) * Issue : treatement of radiative decays with PHOTOS

  3. Comment : Babar start to give extremely precise results. D semileptonic decays (Mpole, a,..d) ? Param. in terms of z ? * Pole dominance / Single pole / Modified pole * D->h l v interesting ? Dsf l v vs D K l n (same pole)….? * Dpln possible, interesting proposal of measuring Vub from the ratio with Bpln in same v.k bin. Feasible ? Precision on Vub ? Alternative way to get Vtd/Vts Comments Br(rg) @ 20% radiative decays. * Br(rg)/Br(K*g) ~ form factor ratio ~ 1.2+-0.1 can be improved ? the error is lattice dominated ? * BR(rg) can you calculate the annihiliation on Lattice ? Comments: from Babar Dslv fDs@ 10% using Br(Dsfp) Btn start to be measured Leptonic decays Get fBs/fBd Issue : better determination of BBs/BBd to get x Best way ? * from Lattice calculating directly. * measuring fDs/fD+ and using lattice double ratio calcs. (Damir) * from fp/fK (see results in Christine talk) x@(1-2%)

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