Higgs hunting with B decays

Abstract

B physics is sensitive to the effects of Higgs bosons in the Minimal Supersymmetric Standard Model, if the parameter tan beta is large. I briefly summarise the role of B -> mu+ mu- and B -> tau nu in the hunt for new Higgs effects and present new results on the decay B -> D tau nu: Using the analyticity properties of form factors one can predict the ratio R=Br(B -> D tau nu)/Br(B -> D l nu), l=e,mu, with small hadronic uncertainties. In the Standard Model one finds R= 0.31 +/- 0.02, Br(B^- -> D^0 tau^- anti-nu) = (0.71 +/- 0.09)% and Br(anti-B^0 -> D^+ tau^- anti-nu)= (0.66 +/- 0.08)%, if the vector form factor of the Heavy Flavor Averaging Group is used. B -> D tau nu is competitive with B -> tau nu in the search for effects of charged Higgs bosons. Especially sensitive to the latter is the differential distribution in the decay chain anti-B -> D anti-nu tau^-[->pi- nu].

Talk at Second Workshop on Theory, Phenomenology and Experiments in Heavy Flavour Physics, June 16-18 2008, Anacapri, Italy. 6 pages, 4 figures. Remark on D energy, 3 figures and Eqs. (7),(10) corrected. 3 references added

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