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Particle physics is the study of the fundamental forces of nature as they are embodied in the interactions of elementary and composite particles at high energies and short time and distance scales. DO NOT USE THIS TAG for point particles in classical mechanics.

1 vote
1 answer
221 views

$W$ Boson scattering off another $W$ (Feynman diagrams)

I am somewhat confused on how to solve this. The statement "at most one virtual particle" is the one that is puzzling me. Any advice on how to think about this?
2 votes
0 answers
130 views

Running coupling constants

I am slightly confused about the coupling constants of the fundamental forces and would really appreciate some help in clearing up this confusion. Some sources(like this one: http://hyperphysics.phy-a …