model independence of the signal selection efficiency by an additional few percent.

Furthermore, an algorithm for a topological selection closely matching the one at the reconstruction level is applied as part of the fiducial phase space definition. At least two SFOS lepton pairs are required, and all SFOS lepton pairs are used to form $\PZ$ boson candidates. The SFOS pair with invariant mass closest to the nominal $\PZ$ boson mass ($91.188\GeV$) is taken as the first $\PZ$ boson candidate (denoted as $\PZ_{1}$). The mass of the $\PZ_{1}$ candidate must satisfy $40 < m(\PZ_{1}) < 120\GeV$. The remaining set of SFOS pairs are used to form the second $\PZ$ boson candidate (denoted as $\PZ_{2}$). In events with more than one $\PZ_{2}$ candidate, the SFOS pair with the largest sum of the transverse momenta magnitudes, $\Sigma |\pt|$, is chosen. The mass of the $\PZ_{2}$ candidate must satisfy $12 < m(\PZ_{2}) < 120\GeV$. Among the four selected leptons, any pair of leptons $\ell_{i}$ and $\ell_{j}$ must satisfy $\Delta R(\ell_{i}\ell_{j})>0.02$. Similarly, of the four selected leptons, the invariant mass of any opposite-sign lepton pair must satisfy $m(\ell_{i}^{+}\ell_{j}^{-})>4\GeV$. Finally, the invariant mass of the Higgs boson candidate must satisfy $105 < m_{4\ell} < 140\GeV$. The 