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Open Access Publications from the University of California

Multiple parton scattering in nuclei: Beyond helicity amplitude approximation

  • Author(s): Zhang, Ben-Wei;
  • Wang, Xin-Nian
  • et al.

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.

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