3 ms·
It is not a make-believe diagram. It is a completely valid diagram, but it i just part of something bigger. Also the two quarks in the diagram need to ultimatel
by nhatcher 10y ago
It is not a make-believe diagram. It is a completely valid diagram, but it i just part of something bigger. Also the two quarks in the diagram need to ultimately couple to something else. The "in" and "out" final states must be colorless.
QCD is a extremely complex theory, one usually computes a piece of the puzzle and tries to extract physical information from that.
- untilted 10y agoJust to add to this: The part that comes this initial gluon emission (hadronization) is not very well understood since at this length scale the perturbative (i.e., feynman diagram) approach to QCD breaks down. See e.g. http://www.quantumdiaries.org/2010/12/11/when-feynman-diagrams-fail/ http://www.quantumdiaries.org/2010/12/11/when-feynman-diagra...