Project aim:

• consider 1 case study, pick a selection of 2-3 observables, perform a selection of MC variations
• for a given setup X=(FO/matching/merging accuracy, PS model, NP model), produce envelope
• check if the envelope from setup X behaves as expected or not: for instance, it might happen that even in a region that should be dominated by “hard physics” one has a residual dependence upon the NP model.
• check if envelopes from setup X_i and setup X_j overlap at least partially. If there are very large differences, is this expected (given the kinematic region probed and the perturbative/non-perturbative content of the setup)?

Possible test cases:

• pth in gluon-fusion (pros: directly related to STXS bins)
• Drell-Yan (pros: there's data available)
• ttbar (pros: atlas and cms have already several studies performed with identical or very similar settings)

Next steps (meeting on Monday)

• agree on a test case

Interested participants: