Matching Beyond Fixed Orders
From Wiki Les Houches 09
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'''Interested parties''': ''Piergiulio Lenzi, Vitaliano Ciulli, Peter Skands, Leif Lonnblad, Simon Platzer, Jon Butterworth, Jeppe Anderson, Mario Campanelli, Markus Warsinsky, Matthew Schwartz, Peter Loch, Dieter Zeppenfeld, Giacinto Piacquadio, Paulo Francovilla +...'' | '''Interested parties''': ''Piergiulio Lenzi, Vitaliano Ciulli, Peter Skands, Leif Lonnblad, Simon Platzer, Jon Butterworth, Jeppe Anderson, Mario Campanelli, Markus Warsinsky, Matthew Schwartz, Peter Loch, Dieter Zeppenfeld, Giacinto Piacquadio, Paulo Francovilla +...'' | ||
| - | == Chart the problem. Determine some Classic Examples == | + | == Matching in the high energy limit == |
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| + | == Tuning in the presence of matching == | ||
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| + | === Chart the problem. Determine some Classic Examples === | ||
[http://www.slac.stanford.edu/spires/find/hep/www?eprint=arXiv:0903.3918 Effect of ME corrections] on low pT end of the Z pT distribution compared for PYTHIA, HERWIG, Sherpa, Alpgen. Some points: | [http://www.slac.stanford.edu/spires/find/hep/www?eprint=arXiv:0903.3918 Effect of ME corrections] on low pT end of the Z pT distribution compared for PYTHIA, HERWIG, Sherpa, Alpgen. Some points: | ||
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PL slide to be linked here. | PL slide to be linked here. | ||
| - | == | + | == How would low x logs/high energy limit affect tunes? == |
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| - | How would low x logs affect tunes? | + | |
Expect extra events at with high rapidity jets due to: | Expect extra events at with high rapidity jets due to: | ||
Revision as of 13:32, 13 June 2009
Interested parties: Piergiulio Lenzi, Vitaliano Ciulli, Peter Skands, Leif Lonnblad, Simon Platzer, Jon Butterworth, Jeppe Anderson, Mario Campanelli, Markus Warsinsky, Matthew Schwartz, Peter Loch, Dieter Zeppenfeld, Giacinto Piacquadio, Paulo Francovilla +...
Contents |
Matching in the high energy limit
Tuning in the presence of matching
Chart the problem. Determine some Classic Examples
Effect of ME corrections on low pT end of the Z pT distribution compared for PYTHIA, HERWIG, Sherpa, Alpgen. Some points:
- Affect n=1 ME corrections, Pythia, Herwig, Alpgen+Herwig and Sherpa all pretty much agree. For Algen+Pythia there is a significant difference at low pT. Means that PYTHIA tune would be different for usage with & without Alpgen.
PL slide to be linked here.
How would low x logs/high energy limit affect tunes?
Expect extra events at with high rapidity jets due to:
- large colour singlet contribution. This will have a component with rapidity gaps, and a component where these gaps have been destroyed by UE.
- large colour octet contribution enhanced by low x logs (Jeppes's calculations).
Presumably these effects will distort min bias tunes etc, since this physics is not necessarily in the MC. The first effect actually can be modelled by HERWIG+JIMMY, to some extent at least.
Not addressed:
- How dependent on matching strategy?
- Are there ways of revamping pre-matched tunes?
