In: Physics
a) Interaction between particles is described by exchange of
virtual bosons. The range of interaction is inversely proportional
to the rest mass of these exchange bosons. Explain using diagrams
why the force responsible for binding nucleons into nucleus has a
range of ~10-15 m, even though the rest mass of the exchange gluons
is zero.
b) Using appropriate Feynman diagrams for the electromagnetic
interaction between two electrons, as well as for the strong
interaction between quarks and gluons, contrast the electromagnetic
and strong interaction at large distances. Using these arguments,
explain why quarks are confined into hadrons.