Patrick Janot edited 13311371909925748.tex  over 10 years ago

Commit id: 1e37e1449d7c33356bfdc623c0af769323fccb09

deletions | additions      

       

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\% \\