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We present a measurement of the $\ttbar$ differential cross section withrespect to the $\ttbar$ invariant mass, dSigma/dMttbar, in $\ppbar$ collisionsat $\sqrt{s}=1.96$ TeV using an integrated luminosity of $2.7\invfb$ collectedby the CDF II experiment. The $\ttbar$ invariant mass spectrum is sensitive toa variety of exotic particles decaying into $\ttbar$ pairs. The result isconsistent with the standard model expectation, as modeled by \texttt{PYTHIA}with \texttt{CTEQ5L} parton distribution functions.

physical review letters

First Measurement of the $\lowercase{\ttbar}$ Differential Cross Section  $\lowercase{d\sigma/d}M_{\lowercase{{t\overline{t}}}}$ in  $\lowercase{\ppbar}$ Collisions at $\sqrt{\lowercase{s}}=1.96$ TeV