Reading: Halzen and Martin, Chap. 1, Secs. 2.1-2.12
Comment:
This is a relatively simple example of the use of isospin to obtain
useful relations among particle cross sections by decomposing a
complete set of scattering amplitudes in terms of a smaller set of isospin
amplitudes.
Comment:
This problem illustrates how one can determine the isospin, hence the
quark structure, of an unstable resonance state by using the branching
ratios for it's strong decays. The key assumption is the conservation
of isospin in strong interactions.
