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2017:groups:tools:shower_variations [2017/06/11 11:35] emanuele.re |
2017:groups:tools:shower_variations [2017/06/13 11:11] marek.schoenherr |
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===== Shower Variations sub working group ===== | ===== Shower Variations sub working group ===== | ||
+ | [MC generators perturbative uncertainties] | ||
- | ** interested people:** Emanuele, Stefan, Luca, Efe, Vitaliano, ADD YOUR NAME HERE | + | ** interested people:** Emanuele, Stefan, Luca, Efe, Vitaliano, Kenneth, Carlo, Adil Jueid, Andrzej, Simon, Philippe G., Josh MC, Simone, Marek, ...ADD YOUR NAME HERE... |
This page is intended to collect information on shower uncertainty discussions. Here are the kick-off talks: | This page is intended to collect information on shower uncertainty discussions. Here are the kick-off talks: | ||
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| {{ :2017:splaetzer_slides.pdf | Parton shower variations in Herwig}} | | | {{ :2017:splaetzer_slides.pdf | Parton shower variations in Herwig}} | | ||
- | main scales in the game: | + | ** main scales in the game:** |
(1) muR, muF (in MEs) | (1) muR, muF (in MEs) | ||
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(3) t_alpha, t_pdf (ren end fact scales in parton shower) | (3) t_alpha, t_pdf (ren end fact scales in parton shower) | ||
- | first round of discussions: | + | |
+ | ** first round of discussions:** | ||
- in general it seems we are not yet in the position of systematically assessing the logarithmic accuracy of a (N)LO+PS prediction (beyond LL), although for some observables this might be possible. | - in general it seems we are not yet in the position of systematically assessing the logarithmic accuracy of a (N)LO+PS prediction (beyond LL), although for some observables this might be possible. | ||
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---- | ---- | ||
- | Next steps: | + | ** Next steps:** |
1) people interested, please sign | 1) people interested, please sign | ||
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2) meet and decide process(es) to run, settings (pdf, couplings, etc), and observables | 2) meet and decide process(es) to run, settings (pdf, couplings, etc), and observables | ||
- | 3) suggestions/criticisms/improvements: please don't hesitate! | + | 3) suggestions/criticisms/improvements: please don't hesitate ! |
- | ---- | + | ---- |
+ | |||
+ | ** further thoughts ** | ||
Concerning (3): some of us are interested in understanding better, for instance, what happens if t_alpha is varied. Not yet clear if this discussion will bring to results that can be included in the proceedings, but at least we are having a common discussion! | Concerning (3): some of us are interested in understanding better, for instance, what happens if t_alpha is varied. Not yet clear if this discussion will bring to results that can be included in the proceedings, but at least we are having a common discussion! | ||
+ | |||
+ | Obviously any other attempt to understand what happens when playing also with the other settings is welcome, and if any of you find something interesting, the LH proceedings are probably a good place to report your findings. |