Uncertainties in parton related quantities
نویسندگان
چکیده
منابع مشابه
Uncertainties in Parton Related Quantities
R.S. Thorne Cavendish Laboratory, University of Cambridge, UK Abstract I discuss the issue of uncertainties in parton distributions and in the physical quantities which are determined in terms of them. While there has been significant progress on the uncertainties associated with errors on experimental data, there are still outstanding questions. Also, I demonstrate that in many circumstances t...
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High-energy particles interact through their quark and gluon constituents—the partons. By the asymptotic freedom of QCD, the parton cross sections may be approximated by perturbation theory. Then by the factorization theorem of QCD, the parton distribution functions of hadrons are the link between perturbative QCD and experimental measurements. This theory applies to a variety of high-energy pr...
متن کاملar X iv : h ep - p h / 02 05 23 5 v 1 2 1 M ay 2 00 2 Uncertainties in Parton Related Quantities
I discuss the issue of uncertainties in parton distributions and in the physical quantities which are determined in terms of them. While there has been significant progress on the uncertainties associated with errors on experimental data, there are still outstanding questions. Also, I demonstrate that in many circumstances this source of errors may be less important than errors due to underlyin...
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We investigate the polarized parton distribution functions (PDFs) and their uncertainties by using the world data on the spin asymmetry A1. The uncertainties of the polarized PDFs are estimated by the Hessian method. The up and down valence-quark distributions are determined well. However, the antiquark distributions have large uncertainties at this stage, and it is particularly difficult to fi...
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We study the uncertainties in parton distributions, determined in global fits to deep inelastic and related hard scattering data, due to so-called theoretical errors. Amongst these, we include potential errors due to the change of perturbative order (NLO → NNLO), ln(1/x) and ln(1 − x) effects, absorptive corrections and higher-twist contributions. We investigate these uncertainties both by incl...
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ژورنال
عنوان ژورنال: Journal of Physics G: Nuclear and Particle Physics
سال: 2002
ISSN: 0954-3899
DOI: 10.1088/0954-3899/28/10/314