Measurement of the ratio of differential cross sections {\sigma}(ppbar -> Z + b jet)/{\sigma}(ppbar -> Z + jet) in ppbar collisions at sqrt(s)=1.96 TeV

TL;DR

This paper reports a precise measurement of the ratio of Z boson production with b jets to Z production with any jet in proton-antiproton collisions at 1.96 TeV, comparing results with theoretical predictions.

Contribution

It provides the first detailed measurement of the Z + b jet to Z + jet cross section ratio as a function of multiple kinematic variables at Tevatron energies.

Findings

Measured the ratio across different kinematic variables.

Compared results with NLO calculations and Monte Carlo models.

Found consistency within uncertainties with theoretical predictions.

Abstract

We measure the ratio of cross sections, {\sigma}(ppbar -> Z + b jet)/{\sigma}(ppbar -> Z + jet), for associated production of a Z boson with at least one jet. The ratio is also measured as a function of the jet transverse momentum, jet pseudorapidity, Z boson transverse momentum, and the azimuthal angle between the Z boson and the closest jet for events with at least one b jet. These measurements use data collected by the D0 experiment in Run II of Fermilab's Tevatron ppbar Collider at a center-of-mass energy of 1.96 TeV, and correspond to an integrated luminosity of 9.7 fb$^{-1}$. The results are compared to predictions from next-to-leading order calculations and various Monte Carlo event generators.