Next-to-leading-order QCD corrections and parton-shower effects for weakino+squark production at the LHC

Abstract

We present a calculation of the next-to-leading order QCD corrections to weakino+squark production processes at hadron colliders and their implementation in the framework of the POWHEG-BOX, a tool for the matching of fixed-order perturbative calculations with parton-shower programs. Particular care is taken in the subtraction of on-shell resonances in the real-emission corrections that have to be assigned to production processes of a different type. In order to illustrate the capabilities of our code, representative results are shown for selected SUSY parameter points in the pMSSM11. The perturbative stability of the calculation is assessed for the $pp\to {\tilde{\chi }}_1^0{\tilde{d}}_L$ process. For the squark+chargino production process $pp\to {\tilde{\chi }}_1^{-}{\tilde{u}}_L$ distributions of the chargino's decay products are provided with the help of the decay feature of PYTHIA 8.

Comments: 26 pages, 13 figures, version accepted by JHEP