The Ratio of W + N jets To Z/gamma + N jets As a Precision Test of the Standard Model

Abstract

We suggest replacing measurements of the individual cross-sections for the production of W + N jets and Z/gamma + N jets in searches for new high-energy phenomena at hadron colliders by the precision measurement of the ratios (W+0 jet)/(Z+0 jet), (W+1 jet)/(Z+1 jet), (W+2 jets)/(Z+2 jets),... (W+N jets)/(Z+N jets), with N as large as 6 (the number of jets in ttbarH). These ratios can also be formed for the case where one or more of the jets is tagged as a b or c quark. Existing measurements of the individual cross sections for Wenu + N jets at the Tevatron have systematic uncertainties that grow rapidly with N, being dominated by uncertainties in the identification of jets and the jet energy scale. These systematics, and also those associated with the luminosity, parton distribution functions (PDF's), detector acceptance and efficiencies, and systematics of jet finding and b-tagging, are expected to substantially cancel in calculating the ratio of W to Z production in each N-jet channel, allowing a greater sensitivity to new contributions in these channels in Run II at the Tevatron and at the LHC.

10 pages, 8 figures, added references

References in corpus (7)

• MadEvent: Automatic Event Generation with MadGraph
• Uncertainties of predictions from parton distributions. I: experimental errors
• Next-to-leading order corrections to W+2 jet and Z+2 jet production at hadron colliders
• Multijet matrix elements and shower evolution in hadronic collisions: W b bbar + n jets as a case study
• Search for Single-Top-Quark Production in p-pbar Collisions at sqrt(s)=1.8 TeV
• Study of the heavy flavor content of jets produced in association with W bosons in $p\bar{p}$ collisions at $\sqrt{s}$ = 1.8 TeV
• Search for New Heavy Particles in the WZ Final State in Proton Anti-Proton Collisions at Sqrt{s} = 1.8 TeV

Cited by in corpus (14)

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• Precise Predictions for Z + 4 Jets at Hadron Colliders
• Susy Theories and QCD: Numerical Approaches
• Ratios of $W$ and $Z$ cross sections at large boson $p_T$ as a constraint on PDFs and background to new physics
• A measurement of the ratio of the production cross sections for W and Z bosons in association with jets with the ATLAS detector
• NLO QCD Predictions for $Wb\bar{b}$ Production in Association with up to Three Light Jets at the LHC
• A measurement of the ratio of the W and Z cross sections with exactly one associated jet in pp collisions at sqrt(s) = 7 TeV with ATLAS
• The BlackHat Library for One-Loop Amplitudes
• Weak Vector Boson Production with Many Jets at the LHC $\sqrt{s}=13$ TeV
• Extrapolating W-Associated Jet-Production Ratios at the LHC
• Search for the Neutral Current Top Quark Decay t-->Zc Using the Ratio of Z-Boson + 4 Jets to W-Boson + 4 Jets Production
• Production of jets accompanied by W and Z bosons at LHC startup