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研究生： 黃振輝
Chan-Fai Wong
論文名稱： 利用更新的微擾量子色動力學計算魅夸克產生的大氣微中子流量
An Updated Perturbative QCD Calculation on the Prompt Atmospheric Neutrino Flux
指導教授： 林貴林
Guey-Lin Lin
張敬民
Kingman Cheung
口試委員:
學位類別： 碩士
Master
系所名稱： 理學院 - 物理學系
Department of Physics
論文出版年： 2007
畢業學年度： 95
語文別： 英文
論文頁數： 31
中文關鍵詞： 量子色動力學 、微中子 、魅夸克
外文關鍵詞： QCD, Neutrino, Charm quark, Next-to-leading order, parton distribution function
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    • 目前物理界對在高能量的大氣微中子流量的估算還存在很多不確定性, 其中一個很重要的原因是我們對高能量的大氣輕子是如何生成的還是不太清楚。一般來講, 我們相信大氣微中子的通量主要可以分成兩種: 一種是‘傳統微中子通量’(conventional neutrino flux), 主要是由Pions 和Kaons所生成; 另外一種是‘魅夸克產生的微中子通量’(prompt neutrino flux), 主要是由D-mesons所生成. 因為後者的PRODUCTION PROCESS涉及到微擾量子色動力學, 所以在本文的主要目的在於重新探討NLO微擾量子色動力學(Next-to-leading order perturbative QCD)對大氣微中子流量的影響; 並且比較目前最新的parton distribution function (CTEQ 6)跟前人所用的parton distribution function (CTEQ 3)所算到的結果有何不同, 從而對parton distribution function對大氣微中子流量的影響有進一步的了解.

    We discuss the calculation of the prompt atmospheric neutrino flux, which is produced by the charmed particles. By reexamining one of the charm production model—perturbative QCD, we obtain an updated result on the charm
    production K-factor based upon CTEQ6 parton distribution function. The new K-factor leads to an updated result on the prompt atmospheric neutrino flux based upon next-to-leading order perturbative QCD. The effect of parton distribution function on the above flux is discussed in detail.

    1 Introduction 1.1 Motivation 1.2 The relation between charmed particles and the atmospheric neutrino flux 2 Atmospheric neutrino flux and its relation to the charmed particles productions 2.1 Calculation of the atmospheric lepton flux 2.1.1 Cascade equation 2.1.2 Solution to the cascade equation and the Z-moment 2.2 The contribution of charm 2.3 The Z-moments 3 Perturbative QCD 3.1 The next-to-leading-order corrections 3.2 The K-factor 4 The effect of parton distribution function on the prompt neutrino flux 4.1 Evalation of Zpc 4.2 Comparison between CTEQ3 and CTEQ6 5 Conclusion and outlook 5.1 Conclusion 5.2 Outlook

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