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    TH Meeting on Particle Physics Phenomenology

    Parton densities and structure functions at NNLO and beyond

    by Andreas VOGT (University of Leiden)

    → Europe/Zurich
    TH Auditorium (CERN)

    TH Auditorium

    CERN
    Description
    The evolution of unpolarized parton densities and structure functions is discussed in massless perturbative QCD. The available partial results for the three-loop splitting functions are shown to facilitate reliable next-to-next-to-leading order (NNLO) calculations for a large part of the kinematical region relevant to the LHC. This allows a considerable reduction of the theoretical uncertainties of the parton densities. Corresponding results for the three-loop DIS coefficient functions are employed to treat the scaling violations of the flavour non-singlet structure functions up to N3LO, reducing the theoretical uncertainty of determinations of a s(MZ) from these observables to about 1%. Also presented are estimates of terms of even higher order by Pade approximations and other methods.