反电子对在光子链图传播下的散射几率幅毕业论文.doc

0B.S. Dissertation of Chongqing 在光子链图传播下的散射几率幅 The probability amplitude of dispersion depending on the photon-chain propagator correction 摘 要 二体散射问题是量子电动力学研究的一个重要课题，电子对的散射，反电子对的散射及正反电子对的散射均属于这一范畴。关于二体散射，主要研究这些粒子的散射几率及寿命等，而这些都必须引用散射几率密度幅这个重要参量。本文即在以量子电动力学为主要粒子物理理论下对反电子对的散射求解其几率密度幅，本文依Feynman规则计算了反电子对在单链图下的散射几率密度幅，并且作了光子传播子在传播过程中的单圈及多圈链图修正。最后列举了几个点的数据并对修正前后作了比较。通过此研究计算并难了二体散射的几率密度幅的情形，为以后计算散射截面及粒子寿命作了很好的准备工作。 关键词 反电子对；光子传播子；重整化；圈链修正；散射几率密度幅；费曼规则。 Abstract An important subject of studying in quantum electrodynamics is that two particles scattering, the pair of electrons, pair of anti-electrons and scattering of positive and negative electrons pair being this category . About two particles scattering, scattering probability and life-span of main research , and etc.. And all these must quote an this important parameter of the density of scattering probability . This article is right to ask and solve its one of density of probability about scattering of anti-electron under Quantum Electrodynamics as the physics theory of main particle promptly. This article has been calculated to the one of density of scattering probability under the renormalizition’s with Feynman rule, act as photon propagate enclosing and enclosing chain picture revise more only in the course of propagating. Enumerated the data of several points finally and made comparisons to revising. Situation of the one of density of probability of calculating through this research and two difficult body scattering, in order to calculate the scattering section. Keywords Aanti-electron pair; The photon propagates; Rebiuld; chain to revise; density of scattering probability; Feynman rule. PAGE 目录 TOC \o 1-2 \h \z \u HYPERLINK \l _Toc106269259 1 引言 PAGEREF _Toc106269259 \h 1 HYPERLINK \l _Toc106269260 2 散射理论 PAGEREF _Toc106269260 \h 1 HYPERLINK \l _Toc106269261 2.1 反电子与反电子的散射 PAGEREF _Toc106269261 \h 1 HYPERLINK \l _Toc106269262 2.2 Feynman图 PAGEREF _Toc106269262 \h 2 HYPERLINK \l _Toc106269263 2.3自然单