Table 2.

Efficiencies of the total HLT1 selection. The TIS -OR- TOS and TOS efficiencies are calculated using events passing the GEC (definitions for TIS, TOS and GEC are in the text). All efficiencies and their uncertainties are quoted in percentages and are determined from the different signal samples, with selections resulting in the rates given in Table 1. Signal events are selected with the following criteria: b and c hadrons have a $p_{\mathrm{T}}>2$ GeV and a lifetime $\tau >0.2$ ps. Children of b and c hadrons have $p_{\mathrm{T}}>200$ MeV. Children of Z bosons have $p_{\mathrm{T}}>20$ GeV

Signal	GEC	TIS -OR- TOS	TOS	$\mathrm{GEC}\times \mathrm{TOS}$
$B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$	89 ± 2	91 ± 2	89 ± 2	79 ± 3
$B^0\to K^{\ast 0}{e}^{+}{e}^{-}$	84 ± 3	69 ± 4	62 ± 4	52 ± 4
$B_s^0\to \varphi \varphi$	83 ± 3	76 ± 3	69 ± 3	57 ± 3
$D_s^{+}\to K^{+}{K}^{-}{\pi }^{+}$	82 ± 4	59 ± 5	43 ± 5	35 ± 4
$Z\to {\mu }^{+}{\mu }^{-}$	78 ± 1	99 ± 0	99 ± 0	77 ± 1