Münster 2017 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 41: Beyond the Standard Model (Theorie) 2
T 41.2: Vortrag
Dienstag, 28. März 2017, 11:15–11:30, VSH 19
NNLL-fast: Predictions for Squark and Gluino Production at the LHC with Soft and Coulomb Gluon Resummation — Wim Beenakker1, •Christoph Borschensky2, Michael Krämer3, Anna Kulesza4, and Eric Laenen5 — 1Radboud University Nijmegen, The Netherlands — 2Eberhard Karls Universität Tübingen — 3RWTH Aachen — 4WWU Münster — 5Nikhef Theory Group, Amsterdam, The Netherlands
With the Large Hadron Collider (LHC) now operating at 13 TeV and extending its reach for new physics, the search for supersymmetry (SUSY) requires theoretical predictions to be more precise than ever. Beyond leading order in perturbation theory, large logarithmic terms arise which endanger the validity of the perturbative expansion in certain kinematic regions. Threshold resummation is a technique to sum these terms up to all orders in a systematic manner, restoring the predictive power and significantly impacting the production cross sections.
In my talk, I will present the program package NNLL-fast, providing state-of-the-art cross sections and theoretical uncertainty estimates for the production of squarks and gluinos at the LHC. The cross sections include the resummation of soft gluons up to next-to-next-to-leading logarithmic accuracy as well as Coulomb and bound-state effects in the Mellin-moment space approach. The resummed corrections are positive and in general lead to a reduction of theoretical uncertainties with respect to previous results at lower accuracies.