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

TL;DR

This paper reports the first measurement of the differential cross section of top-antitop quark pairs as a function of their invariant mass in proton-antiproton collisions at 1.96 TeV, providing insights into potential new physics.

Contribution

It presents the first measurement of the $ tbar$ invariant mass spectrum in $ar{p}p$ collisions at this energy, testing the standard model and probing for exotic particles.

Findings

Results are consistent with the standard model predictions.

No evidence of exotic particles decaying into $ tbar$ pairs was observed.

The measured spectrum agrees with PYTHIA simulations using CTEQ5L PDFs.

Abstract

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