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4.3 Top Quark Mass Measurement from $t\bar{t}$ Dilepton events

The top quark mass can also be determined from direct reconstruction of

\begin{displaymath}t \bar{t} \rightarrow W^+ b W^- \bar{b}
\rightarrow \ell^+\ell^-\nu\bar{\nu}b\bar{b} \end{displaymath}

Dilepton events at JLC, in addition to the mass determination from the $t\bar{t}$ threshold scan. CDF and D0 have determined the top quark mass to be $ 174.3 \pm 5.1$ GeV/c2 from direct reconstruction of $t\bar{t}$ events. The top quark mass is expected to be determined to a precision of 1 to 2 GeV/c2 at the Tevatron and the LHC. For direct reconstruction, the Dilepton channel has the smallest systematic uncertainty, in comparison with the Lepton + Jets and Multi-jet channels. In contrast to the hadron colliders, the beam energy at the Linear Collider provides constraints in the kinematic reconstruction. A precision of 200 MeV/c2 on the top quark mass can be achieved at JLC [22].

ACFA Linear Collider Working Group