Natural Order and Science

[Alex K]

It has long been known that the soft divergences occurring in QED can be cancelled out in transition rates or cross sections computed for detectors with finite energy resolution: the soft divergences which occur in a scattering process due to the emission of an undetected soft real photons with total energy ≤ El exactly cancel out the soft divergences due to virtual photon corrections order by order in perturbation theory. This cancellation was first shown by Bloch and Nordsieck in QED and is referred to as Bloch-Nordsieck theorem. In ordinary (commutative) Yang-Mills theories just as in QED, there exist IR (soft) divergences due to MASSLESS GLUONS. This has been guaranteed by the theorems of Kinoshita and of Lee and Nauenberg known as KLN theorem which states that the transition rates are free of the collinear and soft divergences if we sum over initial and final states. This theorem is a fundamental quantum mechanical theorem on the basis of unitarity of S-matrix.

Unless you are one of the authors of arxiv.org/pdf/hep-th/0609181, you are in trouble, Sir. Now copying blog posts isn't good enough any more, now you plagiarize directly from the scientific literature? Way to step up your game