Next: Selection of Specific
Up: Event Selection
Previous: Selection Criteria
The event selection efficiency and background contamination were estimated
using Monte Carlo. The production of tau-pair events at the 
resonance
was simulated using the KORALZ 3.8[10] Monte Carlo generator.
The same program was used to generate muon-pair events, while wide-angle
Bhabha scattering, two-photon interactions, and 
final states were produced
using the generators described in Refs. [11], [12], and
[13], respectively. All these Monte Carlo data samples were subjected
to the SLD detector simulation based on the GEANT 3.15[14] program
and to the above event selection. The SLD trigger was also simulated in the
Monte Carlo.
We determine a tau-pair event selection efficiency of 
,
where the largest loss is due to the solid angle coverage of the CDC.
The trigger efficiency is found to be 
, and the result is
an overall selection efficiency of 
.
Based on these estimates, the measured integrated luminosity, and the
branching fraction, we expect a final tau sample
of 
events, including backgrounds. This is consistent with
the 1671 tau-pair candidate events selected in the data.
From the fraction of Monte Carlo
background events which survive the selection requirements, the purity
of the tau sample is estimated to be 
. The accuracy of these
estimates was checked by comparing data and Monte Carlo distributions for
various quantities used in the event selection.