Multiple Parton Scattering in Nuclei: Beyond Helicity Amplitude Approximation
arXiv:hep-ph/0301195 · doi:10.1016/S0375-9474(03)01003-0
Abstract
Multiple parton scattering and induced parton energy loss in deeply inelastic scattering (DIS) off heavy nuclei is studied within the framework of generalized factorization in perturbative QCD with a complete calculation beyond the helicity amplitude (or soft bremsstrahlung) approximation. Such a calculation gives rise to new corrections to the modified quark fragmentation functions. The effective parton energy loss is found to be reduced by a factor of 5/6 from the result of helicity amplitude approximation.
20 pages, 14 figures