Abstract
Using the LEP 1 ALEPH data (1991–1995) the branching ratio BR( b → τν ̄ τ X ) is found to be (2.41±.21±.34)% using a missing energy technique. A complementary measurement using two leptons in the final state gives (3.94±.67 −56 +.61 )%. Combined together this leads to (2.58±.19±.33)%. The branching ratio BR( b → τν ̄ τ D ̇± X) is measured to be (0.94±.32±.37)% and the following limit is established: B − → τ − ν ̄ τ < .15% at 90% CL. BR( b → τν ̄ τ X ) and BR( B − → τ−ν ̄ τ allow to set a constraint on the charged Higgs mass in the framework of any type 11 Higgs doublet model.
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