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We have developed a new cluster-track matching program. This program improves the invariant mass resolution for W and Higgs mass reconstructions, when the $n \cdot \sigma$ cut is appropriately chosen. The W mass resolution so obtained is around $1.6 {\rm GeV}$ which is now pretty close to $\Gamma_W/2$.

A significant improvement is also achieved in top momentum reconstruction. This benefits us by providing highter detection efficiency, better momentum resolution, and smaller systematic shift in the center value of the reconstructed top momentum.

Keisuke Fujii