2017:groups:higgs:powhegpt

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2017:groups:higgs:powhegpt [2017/07/19 08:32] robert.harlander created |
2017:groups:higgs:powhegpt [2017/11/20 12:18] (current) gudrun.heinrich |
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- | ==== Large pT in POWHEG ==== | + | ===== 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 [[http://arxiv.org/abs/arXiv:1703.09252|arXiv:1703.09252]], or gg->H, see [[http://arxiv.org/abs/arXiv:1510.08850|arXiv:1510.08850]]). | 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 [[http://arxiv.org/abs/arXiv:1703.09252|arXiv:1703.09252]], or gg->H, see [[http://arxiv.org/abs/arXiv:1510.08850|arXiv:1510.08850]]). | ||

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

+ | Here are example plots {{2017:working_groups:sm:nlo_swr_hdamp_pthh_full_py6.pdf| hdamp=250}},{{2017:working_groups:sm:nlo_swr_pthh_full_py6.pdf| 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 [[http://arxiv.org/abs/arXiv:1703.09252|arXiv:1703.09252]]. | ||

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* Is the effect specific to POWHEG? | * Is the effect specific to POWHEG? | ||

* In [[http://arxiv.org/abs/arXiv:1510.08850|arXiv:1510.08850]], it was proposed to restrict the shower scale in the remnant events: is this legitimate for all observables? | * In [[http://arxiv.org/abs/arXiv:1510.08850|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.1500445945.txt.gz ยท Last modified: 2017/07/19 08:32 by robert.harlander

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