کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1845580 | 1528094 | 2012 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
MSTW PDFs and impact of PDFs on cross sections at Tevatron and LHC
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We briefly summarise the “MSTW 2008” determination of parton distribution functions (PDFs), and subsequent follow-up studies, before reviewing some topical issues concerning the PDF dependence of cross sections at the Tevatron and LHC. We update a recently published study of benchmark Standard Model total cross sections (W,Z,ggâH and tt¯ production) at the 7 TeV LHC, where we account for all publicly available PDF sets and we compare to LHC data for W, Z, and tt¯ production. We show the sensitivity of the Higgs cross sections to the gluon distribution, then we demonstrate the ability of the Tevatron jet data, and also the LHC tt¯ data, to discriminate between PDF sets with different high-x gluon distributions. We discuss the related problem of attempts to extract the strong coupling αS from only deep-inelastic scattering data, and we conclude that a direct data constraint on the high-x gluon distribution is required to obtain a meaningful result. We therefore discourage the use of PDF sets obtained from “non-global” fits where the high-x gluon distribution is not directly constrained by data.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Physics B - Proceedings Supplements - Volumes 222â224, JanuaryâMarch 2012, Pages 61-80
Journal: Nuclear Physics B - Proceedings Supplements - Volumes 222â224, JanuaryâMarch 2012, Pages 61-80
نویسندگان
Graeme Watt,