Precise Predictions for Z + 4 Jets at Hadron Colliders

TL;DR

This paper calculates the next-to-leading order QCD cross section for Z boson production with four jets at the LHC, providing essential background estimates for new physics searches.

Contribution

It introduces a feasible computational approach for precise NLO predictions of Z + 4 jets, including decay channels, at hadron colliders.

Findings

Total cross section at 7 TeV for Z + 4 jets computed.

Distributions of jet transverse momenta provided.

Comparison with W + jets production included.

Abstract

We present the cross section for production of a Z boson in association with four jets at the Large Hadron Collider, at next-to-leading order in the QCD coupling. When the Z decays to neutrinos, this process is a key irreducible background to many searches for new physics. Its computation has been made feasible through the development of the on-shell approach to perturbative quantum field theory. We present the total cross section for pp collisions at sqrt{s} = 7 TeV, after folding in the decay of the Z boson, or virtual photon, to a charged-lepton pair. We also provide distributions of the transverse momenta of the four jets, and we compare cross sections and distributions to the corresponding ones for the production of a W boson with accompanying jets.