Evaluation of the Theoretical Uncertainties in the Z to ll Cross Sections at the LHC
Nadia E. Adam, Valerie Halyo, Scott A. Yost
TL;DR
This paper analyzes the main sources of theoretical uncertainties affecting the precision of Z to ll cross-section measurements at the LHC, focusing on QCD, electroweak effects, and computational methods.
Contribution
It provides a comprehensive assessment of systematic errors and recommends optimal simulation tools and schemes for accurate event modeling.
Findings
Quantifies uncertainties from NNLO QCD effects and PDFs.
Evaluates impact of missing NLO electroweak corrections.
Suggests best practices for MC generator implementation.
Abstract
We study the sources of systematic errors in the measurement of the Z to ll cross-sections at the LHC. We consider the systematic errors in both the total cross-section and acceptance for anticipated experimental cuts. We include the best available analysis of QCD effects at NNLO in assessing the effect of higher order corrections and PDF and scale uncertainties on the theoretical acceptance. In addition, we evaluate the error due to missing NLO electroweak corrections and propose which MC generators and computational schemes should be implemented to best simulate the events.
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