Eur. Phys. J. C

**19**, 213-227

DOI: 10.1007/s100520100612

## Measurements of and and upper limits on and

**The ALEPH Collaboration R. Barate and et al.**

Laboratoire de Physique des Particules (LAPP), IN

^{2}P

^{3}-CNRS, 74019 Annecy-le-Vieux Cedex, France

(Received: 2 October 2000 / Published online: 15 March 2001 -© Springer-Verlag 2001)

** Abstract **

Inclusive branching ratios involving
transitions
are measured in approximately four million hadronic Z decays collected
by the ALEPH detector at LEP. The fully-inclusive branching ratio
and the semi-inclusive branching ratio
are measured to be
and
, in agreement with the
standard model predictions. Upper limits on the branching fractions
and
are set to
and
at the
90% C.L.
These results allow a 90% C.L. lower limit of
0.40 (GeV/*c*^{2})^{-1}
to be set on the
ratio, in the framework of type-II
two-Higgs-doublet models.

**©**

*Società Italiana di Fisica, Springer-Verlag 2001*