Relations between b → cτν decay modes in scalar models

  title={Relations between b → c$\tau$$\nu$ decay modes in scalar models},
  author={Stefan Schacht and Amarjit Soni},
  journal={Journal of High Energy Physics},
As a consequence of the Ward identity for hadronic matrix elements, we find relations between the differential decay rates of semileptonic decay modes with the underlying quark-level transition b → cτν, which are valid in scalar models. The decay-mode dependent scalar form factor is the only necessary theoretical ingredient for the relations. Otherwise, they combine measurable decay rates as a function of the invariant mass-squared of the lepton pair q2 in such a way that a universal decay-mode… 

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