New physics through Drell-Yan standard model EFT measurements at NLO

Sally Dawson,Pier Paolo Giardino

doi:10.1103/physrevd.104.073004

Abstract

Drell Yan production is a sensitive probe of new physics and as such has been calculated to high order in both the electroweak and QCD sectors of the standard model, allowing for precision comparisons between theory and data. Here we extend these calculations to the standard model effective field theory and present the next-to-leading order QCD and electroweak contributions to the neutral Drell-Yan process.

Highlights

The measurement of the neutral Drell-Yan (DY) process, pp → ZÃ, γÃ → lþl−, has provided important validation of standard model (SM) predictions, has served as a testing ground for searches for high mass Z0 bosons and other new physics scenarios, and most recently has served as a probe of deviations from the SM in an effective field theory context
Drell Yan production is a sensitive probe of new physics and as such has been calculated to high order in both the electroweak and QCD sectors of the standard model, allowing for precision comparisons between theory and data
We extend our previous DY calculation [48] to include the complete set of SM effective field theory (SMEFT) bosonic operators [52] that contribute at next-to-leading order (NLO) QCD and EW to the process, qq → γÃ, ZÃ → lþl−

Summary

Introduction

The measurement of the neutral Drell-Yan (DY) process, pp → ZÃ, γÃ → lþl−, has provided important validation of standard model (SM) predictions, has served as a testing ground for searches for high mass Z0 bosons and other new physics scenarios, and most recently has served as a probe of deviations from the SM in an effective field theory context. For all of these applications, precise theoretical predictions both in the SM and in the effective field theory are crucial. In the effective field theory context, the new physics effects can show up as enhancements at large partonic energy scales, where the effects of electroweak Sudakov logarithms are relatively large [27,28], mandating precision calculations in the effective field theory beyond the existing SM results

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Conclusion