A Measurement of the Ratio of Inclusive Cross Sections pp->Z+b-jet/pp->Z+jet at sqrt(s) = 1.96-TeV

TL;DR

This paper reports the first measurement of the ratio of inclusive cross sections for Z+b-jet to Z+jet production at the Tevatron, providing important data for Higgs searches and testing Standard Model predictions.

Contribution

It presents the first measurement of the Z+b-jet to Z+jet cross section ratio at 1.96 TeV, using data from the DZero detector and Z decay modes to electrons and muons.

Findings

Measured ratio: 0.023 +/- 0.005

Results agree with next-to-leading order Standard Model predictions

Provides crucial background information for Higgs boson searches

Abstract

Using the data collected with the DZero detector at sqrt(s)=1.96-TeV, for integrated luminosities of about 180 pb^{-1}, we have measured the ratio of inclusive cross sections for p+pbar->Z+bjet to p+pbar->Z+jet production. The inclusive Z+b-jet reaction is an important background to searches for the Higgs boson in associated ZH production at the Fermilab Tevatron collider. Our measurement is the first of its kind, and relies on the Z->e^+e^- and Z->mu^+mu^- modes. The combined measurement of the ratio yields 0.023 +/- 0.005 for hadronic jets with transverse momenta p_T>20 GeV/c and pseudorapidities |eta|<2.5, consistent with next-to-leading order predictions of the standard model.