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

T. Aaltonen

Paper

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

Abstract

We present a measurement of the

differential cross section with respect to the

invariant mass, dSigma/dMttbar, in

collisions at

TeV using an integrated luminosity of

collected by the CDF II experiment. The

invariant mass spectrum is sensitive to a variety of exotic particles decaying into

pairs. The result is consistent with the standard model expectation, as modeled by \texttt{PYTHIA} with \texttt{CTEQ5L} parton distribution functions.