Parametrization dependence andΔχ2in parton distribution fitting
نویسندگان
چکیده
منابع مشابه
Parametrization of polarized parton distribution functions
Polarized parton distribution functions are determined by using asymmetry A 1 data from longitudinally polarized deep inelastic scattering experiments. From our χ 2 analysis, polarized u-valence, d-valence, antiquark, and gluon distributions are obtained. We propose one set of leading-order distributions and two sets of next-to-leading-order ones as the longitudinally-polarized parton distribut...
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High energy hadrons interact through their quark and gluon constituents. The interactions become weak at short distances thanks to the asymptotic freedom property of QCD, which allows perturbation theory to be applied to a rich variety of experiments. The nonperturbative nature of the proton for single hard interactions is thus characterized by Parton Distribution Functions (PDFs) fa(Q, x) of m...
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Recently there has been renewed interest on polarized parton distributions in the nucleon, largely stimulated by the development of the next-to leading order(NLO) QCD calculations of polarized parton distribution functions and acquisition of high-precision polarized data on various targets. In this work, requiring reasonable physical conditions, (1)the positivity condition and (2) the counting ...
متن کاملParametrization of polarized parton distributions
We report the polarized parton distributions proposed by the Asymmetry Analysis Collaboration (AAC). Using parametrized distributions at Q 2 =1 GeV 2 and measured A1 data, we determine optimum polarized distributions in the leading order (LO) and next-to-leading order (NLO). We find that the polarized antiquark distribution is not well determined particularly at small x. It could lead to a rath...
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Optimum nuclear parton distributions are obtained by analyzing available experimental data on electron and muon deep inelastic scattering (DIS). The distributions are given at Q 2 =1 GeV 2 with a number of parameters, which are determined by a χ 2 analysis of the data. Valence-quark distributions are relatively well determined at medium x, but they are slightly dependent on the assumed parametr...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2010
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.82.114020