First Measurement of the $t\overline{t}$ Differential Cross Section $d\sigma /d{M}_{t\overline{t}}$ in $p\overline{p}$ Collisions at $\sqrt{s}=1.96\mathrm{TeV}$

We present a measurement of the $t\overline{t}$ differential cross section with respect to the $t\overline{t}$ invariant mass, $d\sigma /d{M}_{t\overline{t}}$, in $p\overline{p}$ collisions at $\sqrt{s}=1.96\mathrm{TeV}$ using an integrated luminosity of $2.7{\mathrm{fb}}^{-1}$ collected by the CDF II experiment. The $t\overline{t}$ invariant mass spectrum is sensitive to a variety of exotic particles decaying into $t\overline{t}$ pairs. The result is consistent with the standard model expectation, as modeled by PYTHIA with CTEQ5L parton distribution functions.

Figure 1

$d\sigma /d{M}_{t\overline{t}}$ measured with $2.7{\mathrm{fb}}^{-1}$ of integrated luminosity.