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ARCHIVE:

Simone Alioli (CERN): The GENEVA Monte Carlo framework: improving SMC with resummation

Tuesday, 25. April 2017, 16:15

Location:  Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock

I will discuss the GENEVA Monte Carlo framework, as an example of how to include analytic resummation in Shower Monte Carlo event generators. GENEVA combines the fully-differential NNLO calculation with higher-order resummation of the resolution parameter, providing a systematic assessment of perturbative uncertainties.
The resulting parton-level events are further combined with parton showering and hadronization in Pythia 8. For the Drell-Yan case presented, the 0-jettiness resummation is carried out to NNLL', which consistently incorporates all singular virtual and real NLO corrections. In this way, the perturbative accuracy of 0-jet-like resummation variables is significantly improved beyond the parton shower approximation. I will show comparisons with LHC measurements at 7 TeV from ATLAS, CMS and LHCb, including results for several underlying-event sensitive observables.

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