$B\to \tau \nu X$ 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($B\text{ra}\tau \nu X$), we find a limit $\tan \beta <0.58m_H/\text{mbox}GeV$ at 90\%\ C.L..

Comments: 15 pages, revtex, 1 postscript figure is attached.