1994/03/28 by Yuval Grossman, Zoltan Ligeti · 4 citations
Computer Science · Physics and Astronomy · #Branching fraction #Computational Physics and Python Applications #Higgs boson #Particle physics theoretical and experimental studies #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #Quark #Scalar (mathematics) #Standard Model (mathematical formulation) #Top quark #Two-Higgs-doublet model #hep-ph
paper · pdf · doi:10.1016/0370-2693(94)91267-x
published as Phys.Lett.B332:373-380,1994 · 16 pages RevTeX + 2 postscript figures included (also available upon request), WIS-94/16/Mar-PH
arxiv created 1994/03/28 · openalex publication_date 1994/07/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We calculate in the framework of two Higgs doublet models the differential decay rate for inclusive B→τ ν X 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 tanβ< 0.51 mH^± [\rm GeV]. We point out that the tau polarization is potentially a more sensitive probe of multi scalar models than the branching ratio itself.