Uncertainty induced by QCD coupling in the CTEQ global analysis of parton distributions

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Title:	Uncertainty induced by QCD coupling in the CTEQ global analysis of parton distributions
Authors:	Hung-Liang Lai 賴宏亮 Zhao Li Pavel Nadolsky Jon Pumplin Daniel Stump C.-P. Yuan Joey Huston
Contributors:	台北市立教育大學應用物理暨化學系
Date:	2010-09
Issue Date:	2012-06-28 12:19:46 (UTC+8)
Abstract:	We examine the dependence of parton distribution functions (PDFs) on the value of the QCD coupling strength $\alpha_{s}(M_{Z})$. We explain a simple method that is rigorously valid in the quadratic approximation normally applied in PDF fitting, and fully reproduces the correlated dependence of theoretical cross sections on $\alpha_s$ and PDF parameters. This method is based on a statistical relation that allows one to add the uncertainty produced by $\alpha_s$, computed with some special PDF sets, in quadrature with the PDF uncertainty obtained for the fixed $\alpha_s$ value (such as the CTEQ6.6 PDF set). A series of four CTEQ6.6AS PDFs realizing this approach, for $\alpha_s$ values in the interval $0.116 \leq \alpha_{s}(M_{Z}) \leq 0.120$, is presented. Using these PDFs, the combined $\alpha_{s}$ and PDF uncertainty is assessed for theoretical predictions at the Fermilab Tevatron and Large Hadron Collider.
Relation:	Physical Review D v.82n.5
Appears in Collections:	[Department of Applied Physics and Chemistry] Periodical Articles

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