Electromagnetic form factor corrections to collisional energy loss of pions and protons, and spin correction for muons - art. no. 017301

At very high energies, the collisional energy loss of hadrons passing throu gh matter is reduced relative to that of a point particle because of their extended electromagnetic structures. For fermions, spin and magnetic moment effects work in the opposite direction. Analytic and numerical results are given for pions, muons, and protons. The reductions are small, but increas e with energy. At 1 TeV, for example, the reduction is 2.7-3.4 % for pions and 1.4-1.9 % for protons, depending on the material. The influence of form factors on the so-called z(3) effect at high energies is also addressed. [ S0556-2821(98)06623-5].