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Study on the Parton Distributions

Author: FangJie
Tutor: RuanJianHong
School: East China Normal University
Course: Theoretical Physics
Keywords: Parton distribution function Multiplicity distribution High twist effect
CLC: O572.2
Type: Master's thesis
Year: 2011
Downloads: 11
Quote: 0
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In the late sixties of the last century , the charged lepton - nucleon deep inelastic scattering experiment at SLAC to first recognize the nuclear many point substances , these substances are called partons . In order to describe the changes in the internal part of the sub- nuclear kinetic processes , the introduction of the parton distribution functions . Parton distribution functions can be divided into the integral distribution function and not integral . Integral part of the sub - distribution function can be used to describe the deep inelastic scattering experiments in the inclusive reaction , the internal structure of the nucleon , it meets the traditional the twist -2DGLAP equation . However, when some sub - density large must consider the interaction between them , there shadowing effect , i.e., high twist phenomenon . Twist -4DGLAP equation modified evolution equation . Two evolution equations , integral part of the sub- distribution function has some differences . Transverse momentum becomes very important when considering the Drell-Yan and other high-energy process , parton distribution function is no longer dependent on a scale not integral to introduce parton distribution functions . Not integral part subfunction is no transverse momentum integral function , it may be that the CCFM equation , CCFM equation currently only calculated using the Monte Carlo method is very complex . This article is based on DGLAP equation integral part of the sub - distribution function by KMR method is not integral part of the sub- distribution function . The experiment can detect particle multiplicity distribution to verify the parton distribution function , which predicted higher collision energy particle multiplicity distribution . This paper studies the twist -4 DGLAP equation integral part of the sub - distribution function with a twist -2 DGLAP equation integral parton distribution function of the difference; Secondly the KMR obtained in both cases is not integral parton distribution functions and compare ; then we use is not integral part of the sub- distribution function , double injection associated experimental calculated to obtain meaningful results ; Finally , we study the multiplicity distribution of particles .

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