英语翻译Quantum electrodynamics (QED),some processes in which we have discussed above,is the prototype quantum field theory.It is characterised by two crucial properties,renormalisability and gauge invariance,which we mention briefly here.Figure

英语翻译Quantum electrodynamics (QED),some processes in which we have discussed above,is the prototype quantum field theory.It is characterised by two crucial properties,renormalisability and gauge invariance,which we mention briefly here.Figure
英语翻译
Quantum electrodynamics (QED),some processes in which we have discussed above,is the prototype quantum field theory.It is characterised by two crucial properties,renormalisability and gauge invariance,which we mention briefly here.Figure 2.1(f) shows a single electron emitting and reabsorbing a virtual photon or a virtual electron-positron pair.The electron line itself in a Feynman diagram represents a “bare” electron ,whereas the real observable particles are the “bare” particles “dressed ” by these virtual processes,the so-called”self-energy” terms which contribute to the mass and charge of the electron that the experimentalist measures.There is no restriction on the momentum k of particles in such virtual states,and such terms are of the form and thus logarithmically divergent.
Divergent terms of this type are present in all QED calculations,e.g.in all the other processes shown in Figure 2.1.Fortunately,it is found possible to redefine the mass or charge as follows.The “bare”mass or charge or (the purely fictitious and unmeasurable value that would obtain in the absence of self-interaction terms )is always found to be multiplied by a dimensionless term containing the divergent integral;since this combination occurs in all calculations,it is therefore replaced by the physical values e,m as determined from experiment.This process is called renormalisation.The procedure is highly technical and beyond the scope of this text.We simply remark that it results in predictions that are,as we have seen ,in incredibly good agreement with experiment.
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英语翻译Quantum electrodynamics (QED),some processes in which we have discussed above,is the prototype quantum field theory.It is characterised by two crucial properties,renormalisability and gauge invariance,which we mention briefly here.Figure
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量子电动力学（量子电动力学） ，其中一些工序中，我们讨论了上述情况，是原型量子场论。它的特点是由两个关键性能， renormalisability和规范不变性，我们略述here.figure 2.1 （六）显示，单电子发射与派到一个虚拟光子或一个虚拟的电子-正电子对。电子线路正处在一个费曼图是一个"裸"电子，而真正看得见的粒子是"裸露"粒子" ，身着" ，由这些虚拟过程，即所谓的"自我能量"的条款...

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量子电动力学（量子电动力学） ，其中一些工序中，我们讨论了上述情况，是原型量子场论。它的特点是由两个关键性能， renormalisability和规范不变性，我们略述here.figure 2.1 （六）显示，单电子发射与派到一个虚拟光子或一个虚拟的电子-正电子对。电子线路正处在一个费曼图是一个"裸"电子，而真正看得见的粒子是"裸露"粒子" ，身着" ，由这些虚拟过程，即所谓的"自我能量"的条款，这有助于向大众和负责电子表示，实验主义措施。是没有限制的势头k的粒子，在这种虚拟的国家，而这些条件的形成，从而对数不一。
分歧的条款，这型是目前所有量子电动力学的计算，例如：在所有其他进程所显示的数字2.1.fortunately ，发现可能重新大规模或征收作为follows.the "裸"地下或收取或（无中生有的和不可测的价值，将获得在缺乏自律-互动条款） ，是历来发现是乘以一个因次任期含有发散积分;由于这一组合出现在所有的计算，因此，这是取代实物价值的英，法米确定的，由e xperiment.this过程叫做r enormalisation。程序是高度技术性及范围之外，这text.we简单一句话，它的结果预测，是，我们已经看到，在令人难以置信好的协议与实验。

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