Cross Section Prediction for Inclusive Production of Z Boson in pp Collisions at root s=14TeV: A Study of Systematic Uncertainty due to Scale Dependence
Abstract
Prediction of Z -> l(+)l(-) production cross section (where l(+/-) =
e(+/-) mu(+/-)) in proton-proton collisions at root s = 14TeV is
estimated up to next-to-next-to-leading order (NNLO) in perturbative QCD
including next-to-leading order (NLO) electroweak (EW) corrections. The
total inclusive Z boson production cross section times leptonic
branching ratio, within 116 GeV, is predicted using NNLO HERAPDF2.0 at
NNLO QCD and NLO EW as.. Tot the invariant mass window 66 < m(u) < 116
GeV, is predicted using NNLO HERAPDF2.0 at NNLO QCD and NLO EW as
sigma(Tot)(z) = 2111.69(-26.92)(+26.31) (PDF) +/- 11 (alpha(s)) +/- 17
(scale(-30.98)(+57.41)) (parameterization and model). Theoretical
prediction of the fiducial cross section is further computed with the
latest modern PDF models (CT14, MMHT2014, NNPDF3.0, HERAPDF2.0, and
ABM12) at NNLO for QCD and NLO for EW. The central values of the
predictions are based on DYNNLO 1.5 program and the uncertainties are
extracted using FEWZ 3.1 program. In addition, the cross section is also
calculated as functions of mu(R) and mu(F) scales. The choice of mu(R)
and mu(F) for scale variation uncertainty is further discussed in
detail.
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