NLO Users-of-Sherpa meeting

Friday 10 Jan 2014, 08:00 → 18:00 Europe/Berlin

Main-2-313 (MPI fuer Physik)

Jan-Christopher Winter (Munich Max Planck Institute for Physics), Steffen Schumann (Universitaet Goettingen)

The basic idea behind this meeting is to communicate the experience we have in doing NLO fixed-order, matched and merged calculations using different one-loop `engines' interfaced to the Sherpa Monte Carlo event generator.

From Sherpa side, we wish to hear any Sherpa-specific problem and/or question you may have. We would like to get feedback on what could be improved in combining your and our parts of the computation. Where do you see bottlenecks that can be avoided.
The Sherpa presentations shall mainly focus on presenting NLO merging and parton shower matching issues to bring these (new) approaches closer to the NLO community.

Of course, the discussion will be open to address other issues as well, for example issues related to the BLHA2, or NLO (one-loop) calculational technicalities and advances (evaluation times, feasibility, limitations etc.) or, most importantly, to present interesting LHC phenomenology.

In summary, feel free to present your most beloved material, and bring forward your Sherpa-specific questions.

Morning Session

Convener: Mr Jan-Christopher Winter (Munich Max Planck Institute for Physics)

1 Recent Developments in GoSam

Speaker: Dr Gionata Luisoni (Max-Planck-Institut für Physik)

Slides LuisoniGionata.pdf

2 High multiplicity NLO with NJet and Sherpa

Speaker: Dr Valery Yundin (Max Planck Institute for Physics)

Slides YundinValery.pdf

11:00 Coffee Break

3 One-loop scattering amplitudes via Laurent expansion with NINJA

Speaker: Mr Tiziano Peraro (Max-Planck-Institut für Physik)

Slides PeraroTiziano.pdf

4 Multijet merging in Sherpa

Speaker: Dr Marek Schoenherr (IPPP Durham)

Slides SchoenherrMarek.pdf

5 NLO merging with Pythia 8

Speaker: Dr Stefan Prestel (DESY Hamburg)

Slides PrestelStefan.pdf

12:40 Lunch Break

Afternoon Session

Convener: Mr Jan-Christopher Winter (Munich Max Planck Institute for Physics)

6 Minimum Bias with SHRiMPS in Sherpa

Speaker: Dr Korinna Zapp (CERN)

Slides ZappKorinna.pdf

7 MCgrid: projecting NLO calculations on grids

Speaker: Dr Steffen Schumann (II. Physikalisches Institut Universitaet Goettingen)

Slides mcgrid.pdf

15:00 Coffee Break

8 Sherpa + OpenLoops: Experience & Suggestions

Speaker: Dr Philipp Maierhoefer (Zurich U)

Slides MaierhoeferPhilipp.pdf

9 Diphoton + 2 jets production at NLO

Speaker: Dr Nicola Adriano Lo Presti (CEA Saclay)

Slides LoPrestiA.pdf

10 Discussion and/or More Contributions

Speaker: All attendees