11 Forces in the Standard Model and Symmetries
85
Fig. 11.3 How a pervading Higgs field gives mass to the fermions of the standard
model. The inside of the square is filled with the Higgs field responsible for all masses
of matter
pulled out of the nucleus and cannot therefore exist as free particles. This then
explains the other mystery as to why nuclear forces are short range. There us
various indirect theoretical evidence for this kind of behavior of the quarks
and gluons.
Final addendum to this chapter: The same spontaneous symmetry breaking
mechanism discussed in Sect. 11.5 is responsible for the mass of leptons and
quarks (see Fig. 11.3). This completes our description of the standard model.