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Nuclear DrellYan process with high energy quark energy loss
Author: SongLiHua
Tutor: DuanChunGui
School: Hebei Normal
Course: Theoretical Physics
Keywords: Nuclear DrellYan process Energy loss Deep inelastic scattering Parton distribution functions Parton distribution Nuclear effects Incident proton Differential cross section Experimental data Quark
CLC: O572.3
Type: Master's thesis
Year: 2004
Downloads: 17
Quote: 0
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Abstract
This article first nuclear effects of nucleon structure functions and explain the main theoretical models of nuclear effects, such as the π mesons surplus model, the quark model, the constituent quark model, Q ^{ 2  rescaling model, dual xrescaling model, and then a brief introduction of these theoretical models of deep inelastic scattering process, the J / Ψ photoproduction process and the interpretation of the effect of the DrellYan process nuclear as well as their respective strengths and weaknesses. However, the fatal weakness of these models is that they are phenomenological introduced adjustable parameters. In 1998, K. J. Eskola. (EKS) and other experimental data by fitting lA deep inelastic scattering and the E772 experimental group DrellYan process, the experimental simulation method first get Q 0 2 = 2.25GeV 2 initial energy nuclear core sub parton distribution function, and then through the DGLAP evolution equation 10 6 ≤ x ≤ 1,2.25 GeV 2 ≤ Q 2 ≤ 10 4 GeV 2 A ≥ of Nucleus Kernel son 2 within parton distribution function. In 2001, Hirai et al (HKM) The bound nucleon for A ≥ 1 in 10 9 ≤ x ≤ 1,1 GeV 2 ≤ Q 2 < / sup> ≤ 10 5 the GeV 2 within the parton distribution functions. They first experimental data for deep inelastic scattering of leptons and nuclei x 2 analysis Q 0 . 2 = 1GeV 2 initial energy nuclear core sub parton distribution functions, then DGLAP equation 10 9 ≤ x ≤ 1,1 GeV 2 ≤ Q 2 ≤ 10 5 the GeV 2 , A ≥ 1 region bound nucleon parton distribution functions. Nuclear DrellYan process is similar to the deep inelastic scattering process is widely used to study nuclear core substructure. In 1999, Fermilab E866 experiments using 800GeV protons against W, Be, Fe, nuclear, and measurement the large x 1 and x of f Regional pW and p Be and pFe and pBe DrellYan cross section ratio for the first time in the experimentally investigated pA collision energy loss effect in the DrellYan process. Energy loss effect in nuclear DrellYan process is different from the shackles of the nuclear parton distribution function of nuclear effects another nuclear effects. This paper attempts to consider the energy loss in the DrellYan process in a concise way, the main role, which x 1 quark longitudinal momentum fraction of the incident proton, x 1 'consider the incident proton energy loss in the quark longitudinal momentum fraction, lt; L gt; A indicates the average path length of the incident quarks in nuclei A, E beam for the incident proton energy, α nuclear DrellYan process after considering the energy loss in the differential cross section formula for the value of energy loss per unit length,: Hirai etal bound nucleon parton distribution functions, the energy loss of use of the above considerations, and discuss the The differential cross section ratio of the abscissa x. nuclear DrellYan process, found that well with the experimental results of the Fermilab E866 group meets. In addition, this paper used KJESkola. Etc. get bound nuclear parton distribution function to calculate the differential cross section in the nuclear DrellYan process than was found not consider the energy loss, the theoretical results with the experimental data was very good . This regard verify the presence of pA collision energy loss, on the other hand also shows a bound nucleon parton distribution function, the experimental data should not include nuclear DrellYan process experimental data because experimental data in the nuclear DrellYan process itself is energy loss. Finally, this paper also proposed to further study the effects of energy loss with lowenergy proton beam for different values ??of the number of nucleons A variety of nuclear experiments.
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CLC: > Mathematical sciences and chemical > Physics > Nuclear physics,high energy physics > Highenergy physics > Particle types
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