Measurement of the t t-bar production cross section in the all-jets final state in pp collisions at sqrt(s) = 8 TeV

TL;DR

This paper measures the top-antitop production cross section in all-jets final states at 8 TeV, revealing softer top quark transverse momentum spectra than predicted by QCD models.

Contribution

First measurement of t t-bar cross section in all-jets final state at 8 TeV with detailed differential spectra comparison.

Findings

Measured cross section: 275.6 pb with uncertainties

Top quark pt spectra are softer than theoretical predictions

Differential cross sections reported at multiple levels

Abstract

The cross section for t t-bar production in the all-jets final state is measured in pp collisions at a centre-of-mass energy of 8 TeV at the LHC with the CMS detector, in data corresponding to an integrated luminosity of 18.4 inverse femtobarns. The inclusive cross section is found to be 275.6 +/- 6.1 (stat) +/- 37.8 (syst) +/- 7.2 (lumi) pb. The normalized differential cross sections are measured as a function of the top quark transverse momenta, pt, and compared to predictions from quantum chromodynamics. The results are reported at detector, parton, and particle levels. In all cases, the measured top quark pt spectra are significantly softer than theoretical predictions.