Parton distributions incorporating QED contributions

  title={Parton distributions incorporating QED contributions},
  author={Alan D. Martin and Richard G Roberts and W. James Stirling and Robert S. Thorne},
We perform a global parton analysis of deep inelastic and related hard-scattering data, including O(α QED) corrections to the parton evolution. Although the quality of the fit is essentially unchanged, there are two important physical consequences. First, the different DGLAP evolution of u and d type quarks introduces isospin violation, i.e. u p = d n , which is found to be unambiguously in the direction to reduce the NuTeV sin 2 θ W anomaly. A second consequence is the appearance of photon… CONTINUE READING
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