1208.2665 (M. V. Garzelli et al.)

t tbar W and t tbar Z Hadroproduction at NLO accuracy in QCD with Parton
Shower and Hadronization effects    [PDF]

M. V. Garzelli, A. Kardos, C. G. Papadopoulos, Z. Trócsányi

We present theoretical predictions for the hadroproduction of t tbar W+, t tbar W- and t tbar Z at LHC as obtained by matching numerical computations at NLO accuracy in QCD with Shower Monte Carlo programs. The calculation is performed by PowHel, relying on the POWHEG-BOX framework, that allows for the matching between the fixed order computation, with input of matrix elements produced by the HELAC-NLO collection of event generators, and the Parton Shower evolution, followed by hadronization and hadron decays as described by PYTHIA and HERWIG. We focus on the dilepton and trilepton decay channels, studied recently by the CMS Collaboration.

View original: http://arxiv.org/abs/1208.2665