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