Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-06-28
JHEP 1108:100,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
44 pages, 19 figures. v2: version published in JHEP (paragraph added at bottom of p.15)
Scientific paper
10.1007/JHEP08(2011)100
We respond to some criticism questioning the validity of the current Standard Model Higgs exclusion limits at the Tevatron, due to the significant dependence of the dominant production cross section from gluon-gluon fusion on the choice of parton distribution functions (PDFs) and the strong coupling (alpha_S). We demonstrate the ability of the Tevatron jet data to discriminate between different high-x gluon distributions, performing a detailed quantitative comparison to show that fits not explicitly including these data fail to give a good description. In this context we emphasise the importance of the consistent treatment of luminosity uncertainties. We comment on the values of alpha_S obtained from fitting deep-inelastic scattering data, particularly the fixed-target NMC data, and we show that jet data are needed for stability. We conclude that the Higgs cross-section uncertainties due to PDFs and alpha_S currently used by the Tevatron and LHC experiments are not significantly underestimated, contrary to some recent claims.
Thorne Robert S.
Watt George
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