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T: Fachverband Teilchenphysik

T 14: QCD (Theorie)

T 14.4: Vortrag

Montag, 9. März 2015, 14:45–15:00, K.12.23 (K1)

Automated soft-gluon resummation in Sherpa — •Piero Ferrarese and Steffen Schumann — II. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

We present a new formalism for the resummation of soft-gluon effects in global event-shape distributions to next-to-leading-logarithmic approximation, implemented in the Sherpa event-generation framework. The evolution of the color structure is highly non-trivial, in particular in processes involving many hard QCD jets. The new framework presented relies on the selection of suitable color bases for the considered processes. We further present a novel approach for the matching of resummed distributions to tree-level matrix elements, exploiting a quasi-local subtraction formalism based on Catani-Seymour dipole factorisation. With this new tool a large class of event-shape variables can be resummed in a fully automated way, allowing to consider processes with up to 2→5 partons at Born level.