The inclusive B → τνX decay in two Higgs doublet models

Yuval Grossman, Zoltan Ligeti

Research output: Contribution to journalArticlepeer-review

79 Scopus citations


We calculate in the framework of two Higgs doublet models the differential decay rate for inclusive B → τνX transitions to order 1 mb2 in the heavy quark expansion, for both polarized and unpolarized tau leptons. In contrast to the situation in the standard model, we find sizeable 1 mb2 corrections. A systematic heavy quark expansion significantly reduces the theoretical uncertainties in the calculation compared to the existing free quark decay model results. From the experimental measurement of the branching ratio, we derive the bound tan β < 0.51mH±[GeV]. We point out that the tau polarization is potentially a more sensitive probe of multi scalar models than the branching ratio itself.

Original languageEnglish
Pages (from-to)373-380
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number3-4
StatePublished - 21 Jul 1994
Externally publishedYes


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