$B\to \tau \nu X$ decays in a two Higgs doublet model

Abstract

We calculate the decay rate for inclusive $B\to \tau \nu X$ decays in a two Higgs doublet model using heavy quark expansion and operator product expansion. Combined with the recent measurement of Br($B \ra τνX$), we find a limit $\tan β< 0.58 m_H/\mbox{GeV}$ at 90\%\ C.L..

15 pages, revtex, 1 postscript figure is attached.