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Les Houches

2019 Session

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Large pT in POWHEG

The issue is a significant hardening of the pT-spectrum after showering in POWHEG+Pythia8 for certain observables, even for non-zero values of the POWHEG damping factor (specific examples are gg→HH, see arXiv:1703.09252, or gg→H, see arXiv:1510.08850).

Here are a few questions/topics that arose in the discussion:

  • Can one identify classes of observables where the effect is more prominent than in others?
  • Is the effect specific to Pythia8, or is it observed also with Pythia6?

Here are example plots hdamp=250, hdamp=infty from gg to HH which suggest that the effect is more pronounced with Pythia8 than with Pythia6. The plots are also in version 2 (journal version) of arXiv:1703.09252.

  • Is the effect specific to POWHEG?
  • In arXiv:1510.08850, it was proposed to restrict the shower scale in the remnant events: is this legitimate for all observables?
2017/groups/higgs/powhegpt.txt · Last modified: 2017/11/20 12:18 by gudrun.heinrich