Measurement of the Top Quark Pair Production Cross Section in the All-jets Decay Channel

TL;DR

This paper reports a measurement of top quark pair production cross section in all-jets decay channels using neural networks to optimize analysis, resulting in a cross section consistent with Standard Model predictions.

Contribution

It introduces a neural network optimized analysis for measuring tbar-t production in all-jets channels, improving the precision of the cross section measurement.

Findings

Measured tbar-t cross section: 7.1 +/- 2.8(stat) +/- 1.5(syst.) pb

Combined with previous results, cross section: 5.9 +/- 1.2(stat) +/- 1.1(syst.) pb

Analysis achieves minimal expected fractional uncertainty

Abstract

We present a measurement of tbar-t production using multijet final states in pbar-p collisions at a center-of-mass energy of 1.8 TeV, with an integrated luminosity of 110.3 pb(-1). The analysis has been optimized using neural networks to achieve the smallest expected fractional uncertainty on the tbar-t production cross section, and yields a cross section of 7.1 +/- 2.8(stat.) +/- 1.5(syst.) pb, assuming a top quark mass of 172.1 GeV/c^(2). Combining this result with previous D0 measurements, where one or both of the W bosons decay leptonically, gives a tbar-t production cross section of 5.9 +/- 1.2(stat) +/- 1.1(syst) pb.