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Higher Twist Effects in Polarized Structure Functions

Author: YangDongYan
Tutor: RuanJianHong
School: East China Normal University
Course: Theoretical Physics
Keywords: Polarized structure function High twist effect Evolution function
CLC: O572.24
Type: Master's thesis
Year: 2009
Downloads: 16
Quote: 0
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Abstract


Spin in the particle interactions, play an important role in the stability of the basic structure of the substances as well as recognized known world . Only a small part of the experimentally observed since the European Muon Collaboration (EMC) of the European Centre for μ sub- nuclear spin from quarks and anti-quarks , the study of the nucleon spin distribution gradually deepening . In the process of exploration , experiment by a large number of high-energy lepton - nucleon deep inelastic scattering , so we understand the the nuclear quark - gluon interactions and information in the nuclear momentum distribution , the polarized structure function data . Over the past 20 years , the experimental accuracy has been greatly improved, which gave many of us a new understanding of the nucleon spin . In theory, the twist of quantum chromodynamics (QCD) linear evolution equation , the basis for the study of the nucleon structure function , it is a ladder diagram summation of the results on the basis of the renormalization group parton evolution . In the small x region , when taking into account the restructuring effect , the linear evolution equation has been unable to fully describe the interaction between the partons must introduce nonlinear amending them . Literature twist -4 amended the evolution equation is given for the first time , the calculation of this paper is based on the evolution equation twist -4 amended as the theoretical basis . Research has focused on high - twist effect in the calculation of the twist -3 this regard , this paper first presents a quantitative calculation of the effect of twist -4 . This paper studies twist -4 effect of the polarized structure function g 1 ( x, Q 2 < / sup> ) and asymmetry A 1 (x , Q 2 ) impact . Focus on the exploration of high- twist effect of the polarized structure function . In this paper mainly covers : deep inelastic scattering experiments and an overview of the parton model and the introduction of the proton spin crisis \LO) high twist effect in the case of the polarized structure function .

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CLC: > Mathematical sciences and chemical > Physics > Nuclear physics,high energy physics > High-energy physics > Particle physics > Interaction
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