Würzburg 2018 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 37: Theorie: QCD / Top-Physik / Elektroschwache Physik
T 37.4: Vortrag
Dienstag, 20. März 2018, 17:15–17:30, Z6 - SR 1.013
Associated production of a top quark pair with a W or Z boson at the LHC at NNLL+NLO — Anna Kulesza1, Leszek Motyka2, •Daniel Schwartländer1, Tomasz Stebel3, and Vincent Theeuwes4 — 1Institute for Theoretical Physics, WWU Münster, D-48149 Münster, Germany — 2Institute of Physics, Jagellonian University, S. Łojasiewicza 11, 30-348 Kraków, Poland — 3Institute of Nuclear Physics PAN, Radzikowskiego 152, 31-342 Kraków, Poland — 4Department of Physics, SUNY Buffalo, 261 Fronczak Hall, Buffalo, NY 14260-1500, USA
The measurements of associated production of a vector or a scalar boson with a top-antitop quark pair provide an important test for the Standard Model at the LHC.
In particular these are the key processes to measure the top quark properties. Furthermore they are very relevant in searches for new physics, both as being directly sensitive to it and as providing an important background.
While NNLO calculations for this particular type of 2 to 3 processes are currently out of reach, a class of corrections beyond NLO can be taken into account with the help of resummation methods. In this talk we consider an application of soft gluon resummation in Mellin space to these processes at hadron colliders and discuss numerical predictions at NNLL matched to NLO precision for the LHC.