Difference: LHCbTheoryRareDecays (2 vs. 3)

Revision 32011-10-27 - JohannesAlbrecht

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META TOPICPARENT name="LHCbNovember2011TheoryWorkshop"

Session on LFV and rare D and B decays

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  List of questions:
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  • SM calculation of BR(Bs-->
mumu): Summarize hte SM calculation with the different approaches. Is there a preferred calculation and where is it published?
ex1
A. Buras et al, arXiv:1007.5291: BR=(3.2+-0.2) x 10-9 and ex2: M. Bona et al. (UTFit Coll): BR= (3.7+-0.5)x10-9 Phys.Lett.B687 (2010) 61. at least in 1), the SM value is not calculated
 
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  • General topics for discussion are:
    • The interplay between the various Rare Decays measurements and measurements of CPV in the B and Charm system.
 
  • What does the excess in B->tau nu tell us about BR Bsmumu and other rare decays?
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    • Measurements with tau decays (this is an area that LHCb is not yet heavily pursuing).

  • Bs -> mu mu:
    • Given the current limits on Bs --> mu mu, what are the prospects on Bs --> tau tau, D0 --> mu mu , and related channels in MFV and non-MFV models?
    • SM calculation of BR(Bs-->mumu): Summarize SM calculation with the different approaches used. Is there a preferred calculation? Suggest a values and publication as SM reference.

  • b --> s l+ l-
    • What are the prospects for measurements of Bd --> K* tau tau? Are new observables accessible with tau reconstruction (helicity of the lepton)?
    • Assuming Bd -> K* mu mu is SM like, what are the prospects with Bs --> phi mu mu and Lambda_b --> lambda mu mu? Can there be large deviations in b -->
d mu+ mu- channels where SM is further suppressed?
  • Can you see large direct CP asymmetries in Bd --> K* mu mu? Are there constraints from non-rare decays that limit the size of the CP violation?
  • Is a large, Babar-like, Isospin asymmetry possible in any class of NP models (whilst remaining consistent with A_I( K* gamma))?
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    • In which model/scenario we might have a LFV decay of tau->mu gamma or tau-->
    3 mu with a BR in the 10-9-10-10 range now that MEG put an upper limit on mu->e gamma at 2.4x10-12 ?
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    • Radiative decays:
      • What are the constraints from b -> d gamma decays? And what can learn from b->d gamma? Do we gain by measuring these suppressed modes versus measurements of b -> s gamma?
     
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    • LFV
      • Given existing results on mu -> e gamma and mu -> 3 e, what are the prospects for tau -> 3 mu?
      • What are the most promising decays to search for lepton flavour violation that can be measured in LHCb (which could include final states with electrons, muons, taus or charged hadrons, e.g. B -> e mu)?
      • What are the correlations with other non-lepton flavour violating observables (e.g. Bs -> mu mu)?
     
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    -- ThomasBlake - 10-Oct-2011
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    -- ThomasBlake - 10-Oct-2011
     
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