精确计算n-■重正化链图传播下n+■→2π~0反应截面  

Accurately calculate cross section of the n+■→2π~0 reaction in the n-■renormalization chain diagram

作　　者：潘宇[1] 王凯俊[1] 方祯云[1] 汪先友[1] 彭庆军[1] 

机构地区：[1]重庆大学理论物理研究所,重庆400044

出　　处：《物理学报》2008年第8期4817-4825,共9页Acta Physica Sinica

基　　金：国家重点基础研究发展规划(批准号:2003CB716300);国家自然科学基金(批准号:10175096);重庆市自然科学基金(批准号:8562)资助的课题~~

摘　　要：采用中子n-反中子■与中性介子π0强相互作用的Lorentz不变耦合模型,对n-■重正化链图传播子作了有关物理分析及其严格解析计算,获得精确理论计算结果.进而将此结果用于n+■→2π0反应的物理过程分析及其截面的计算研究中,并精确计算出n-■重正化链图传播下n+■→2π0反应微分截面.还将此计算结果与n-■树图和重正化单圈链图传播下n+■→2π0反应微分截面作了对比分析,获得了有关辐射修正的重要信息.此结果对于深入研究Lorentz不变耦合模型理论以及深入探索核物理中关于核子、反核子与介子强相互作用的粒子反应截面问题具有一定的参考价值.此外,还将对量子场论微扰理论中关于逐阶重正化计算的不同考虑方式与计算途径及其相关物理过程提供某些值得借鉴之处.Adopting Lorentz-invariant coupling model of neutron n-antineutron n↑- and neutral meson strong interaction,we made physical analysis and accurate calculation of the n-n↑- renormalization chain diagram propagator,and obtained the theoretical results.Furthermore,in applying it to the physical process analysis and cross-section evaluation in the reaction n＋n↑-→2π0,its differential cross-section is obtained.Through the comparison between this calculation and those scenarios,namely the n-n↑- tree diagram and renormalization chain diagram propagator contribution,some important information about radiative correction was obtained.This study would offer certain academic references to the further research on Lorentz-invariant coupling model and the nuclear physics about cross section problem of particles in nucleon antinucleon and neutral meson strong interaction in terms of theoretical calculations.In addition,it will also provide something valuable on relevant physical processes,and on the renormalization calculation orderly with different approaches in perturbation theory of quantum field theory.

关 键 词：Lorentz不变耦合模型 重正化链图传播子 微分截面 辐射修正 

分 类 号：O572.243[理学—粒子物理与原子核物理]