A meta-analysis of parton distribution functions

被引:88
作者
Gao, Jun [1 ]
Nadolsky, Pavel [1 ]
机构
[1] So Methodist Univ, Dept Phys, Dallas, TX 75275 USA
来源
JOURNAL OF HIGH ENERGY PHYSICS | 2014年 / 07期
关键词
QCD Phenomenology; Hadronic Colliders; 3-LOOP SPLITTING FUNCTIONS; QCD;
D O I
10.1007/JHEP07(2014)035
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
A "meta-analysis" is a method for comparison and combination of nonperturbative parton distribution functions (PDFs) in a nucleon obtained with heterogeneous procedures and assumptions. Each input parton distribution set is converted into a "meta-parametrization" based on a common functional form. By analyzing parameters of the meta-parametrizations from all input PDF ensembles, a combined PDF ensemble can be produced that has a smaller total number of PDF member sets than the original ensembles. The meta-parametrizations simplify the computation of the PDF uncertainty in theoretical predictions and provide an alternative to the 2010 PDF4LHC convention for combination of PDF uncertainties. As a practical example, we construct a META ensemble for computation of QCD observables at the Large Hadron Collider using the next-to-next-to-leading order PDF sets from CTEQ, MSTW, and NNPDF groups as the input. The META ensemble includes a central set that reproduces the average of LHC predictions based on the three input PDF ensembles and Hessian eigenvector sets for computing the combined PDF+alpha (s) uncertainty at a common QCD coupling strength of 0.118.
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页数:37
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