Parton Distribution Functions
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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...
متن کاملA New Parametrization of Polarized Parton Distribution Functions
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 کاملBehavior of diffractive parton distribution functions.
Diffractive parton distribution functions give the probability to find a parton in a hadron if the hadron is diffractively scattered. We provide an operator definition of these functions and discuss their relation to diffractive deeply inelastic scattering and to photoproduction of jets at HERA. We perform a calculation in the style of “constituent counting rules” for the behavior of these func...
متن کاملQuasi-Parton Distribution Fuctions, Momentum Distributions, and Pseudo-Parton Distribution Functions
This Article is brought to you for free and open access by the Physics at ODU Digital Commons. It has been accepted for inclusion in Physics Faculty Publications by an authorized administrator of ODU Digital Commons. For more information, please contact [email protected]. Repository Citation Radyushkin, A. V., "Quasi-Parton Distribution Fuctions, Momentum Distributions, and Pseudo-Parton D...
متن کاملNuclear parton distribution functions and energy loss effect in the Drell-Yan reaction off nuclei
The energy loss effect in nuclear matter is another nuclear effect apart from the nuclear effects on the parton distribution as in deep inelastic scattering process. The quark energy loss can be measured best by the nuclear dependence of the high energy nuclear Drell-Yan process. By means of two typical kinds of quark energy loss parametrization and the different sets of nuclear parton distribu...
متن کامل2 00 7 Illuminating the 1 / x moment of parton distribution functions
The Weisberger relation, an exact statement of the parton model, elegantly relates a high-energy physics observable, the 1/x moment of parton distribution functions, to a nonperturbative low-energy observable: the dependence of the nucleon mass on the value of the quark mass or its corresponding quark condensate. We show that contemporary fits to nucleon structure functions fail to determine th...
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