4-11 July 2012
Melbourne Convention and Exhibition Centre
Australia/Melbourne timezone
ICHEP2012 - 36th International Conference for High Energy Physics

NLO Assistance to LHC Searches with Complex Final States using BlackHat and Sherpa

5 Jul 2012, 17:15
Room 219 (Melbourne Convention and Exhibition Centre)

Room 219

Melbourne Convention and Exhibition Centre

Melbourne Australia
Parallel Sessions Track 6. QCD, Jets, Parton Distributions TR 6 - RM 217 - QCD, Jets, Parton Distributions


Prof. Lance Dixon (SLAC National Accelerator Laboratory (US))


The prediction of backgrounds to new physics signals in topologies with large missing transverse energy and jets is important to new physics searches at the LHC. The BlackHat collaboration has investigated theoretical issues in extrapolating backgrounds from experimental control regions to signal regions. For example, we compute, ratios of gamma + n-jet to Z + n-jet production rates and kinematic distributions in NLO QCD, and compare with a parton shower matched to leading-order matrix elements. These predictions validate uncertainty estimates used by CMS for the irreducible Z + n-jet component of MET+jets searches. We also describe the phenomenon of left-handed W polarization at large transverse momentum, its theoretical prediction and recent measurement by CMS and ATLAS, and its potential role in background separation.

Primary author

Prof. Lance Dixon (SLAC National Accelerator Laboratory (US))

Presentation materials