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This measurement can be performed in a very similar manner with the data at $\sqrt{s} = 240$ GeV, albeit with a reduced discrimination between the HZ and the WW fusion contributions. The
statistical precision with which $\sigma_{{\rm WW \to H}} \times {\rm BR(H \to b\bar b)}$ can be measured
at both centre-of-mass energies is displayed in Table~\ref{tab:WWFusion} for TLEP and
ILC, both at 350 GeV and 240-250 GeV. ILC.
\begin{table}
\begin{center}
...
\end{tabular}
\end{center}
\end{table}
The These measurements can also be used to determine the total Higgs decay width in a way similar to that described in the previous section.Indeed, the total Higgs boson width is given
by the following formula:
$$ by:
\begin{equation}
\Gamma_{\rm tot} = { {\Gamma {\rm(H \to WW)}} \over {{\rm BR(H \to WW)}}
}.$$ }.
\end{equation}
The partial decay width $\Gamma{\rm(H \to WW)}$ is directly proportional to the inclusive cross section $\sigma_{\rm WW \to H}$. The Higgs boson branching ratios to WW and to ${\rm b\bar b}$ are in turn obtained from the measurements performed at $\sqrt{s} = 240$ GeV, the precision of which can be inferred from Table~\ref{tab:HiggsBranching}. With the 350 (240) GeV data, TLEP is therefore able to determine the Higgs boson decay width with a precision of the order of
1.1\% (2.3\%) 1.2\% (2.4\%) with WW fusion. When combined with the ZZZ final state, the precision on the total Higgs boson width from TLEP is estimated to be
0.9\%. 1.0\%. These numbers are summarized in Table~\ref{tab:Width}, together with a comparison with ILC
predictions. potential at the same centre-of-mass energies.
\begin{table}
\begin{center}
\caption{Table~\ref{tab:Width}: Statistical precision of the total Higgs boson width measurements from TLEP and
ILC.\label{tab:Width}} ILC at $\sqrt{s}=$ 240-250 and 350 GeV.\label{tab:Width}}
\begin{tabular}{|r|r|r|}
\hline Process and final state & TLEP & ILC \\ \hline
\hline ${\small \epemto {\rm HZ}}$ with ${\rm \small H \to ZZ}$ & {\bf 3.1\%} & 20\% \\