Throughout this section units are used in which h =c =1.The following conversions are useful:hc =197.3 MeV fm,(hc)2 =0.3894 (GeV)2 mb.
47.1.Lorentz transformations
The energy E and 3-momentum p of a particle of mass m form a 4-vector p =(E,p) whose square p2 ≡ E2-|p|2 =m2.