Monday, May 20, 2013

1305.4061 (Ryan Gavin et al.)

Matching Squark Pair Production at NLO with Parton Showers    [PDF]

Ryan Gavin, Christian Hangst, Michael Krämer, Margarete Mühlleitner, Mathieu Pellen, Eva Popenda, Michael Spira
The pair production of squarks is one of the main search channels for supersymmetry at the LHC. We present a fully differential calculation of the next-to-leading order (NLO) SUSY-QCD corrections to the on-shell production of a pair of squarks in the Minimal Supersymmetric Standard Model (MSSM), supplemented by the leading-order decay of the squarks to the lightest neutralino and a quark. In addition, we use the Powheg method to match our NLO calculation with parton showers. To this end, the process was implemented in the Powheg-Box framework and interfaced with Pythia6 and Herwig++. We study the differential scale dependence and K-factors, and investigate the effects of the parton showers for a benchmark scenario in the constrained MSSM.
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