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MSTW PDFs and impact of PDFs on cross sections at Tevatron and LHC | | Graeme Watt
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5 Jan 2012 | | Abstract: | 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, gg->H and t-tbar 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 t-tbar 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 t-tbar data, to discriminate between PDF sets with
different high-x gluon distributions. We discuss the related problem of
attempts to extract the strong coupling alpha_S 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. | | Source: | arXiv, 1201.1295 | | Services: | Forum | Review | PDF | Favorites | |
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