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    TH Meeting on Particle Physics Phenomenology

    Next-to-next-to-leading logarithmic corrections at small transverse momentum in hadronic collisions

    by Daniel DE FLORIAN (ETH Zürich)

    → Europe/Zurich
    TH Auditorium (CERN)

    TH Auditorium

    CERN
    Description
    We consider the region of small transverse momenta in qqbar and gg initiated processes with no coloured particle detected in the final state. By using the recent knowledge on the infrared behaviour of tree-level and one-loop QCD amplitudes at order a2s we compute the universal expression of the large logarithmic corrections up to next-to-next-to-leading accuracy. From there we extract the coefficients that allow the resummation of the large logarithmic contributions. We find that the coefficient known in the literature as B(2) is process dependent, since it receives a hard contamination from the one-loop correction to the leading-order subprocess. We propose a modified form of the resummation formula where the process dependence is embodied in a single perturbative factor.