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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 +...''
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- | == Chart the problem. Determine some Classic Examples ==
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- | [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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- | * 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.
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- | PL slide to be linked here.
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- | == Influence of UE on matching and vice versa ==
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- | How would low x logs affect tunes?
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- | Expect extra events at with high rapidity jets due to:
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- | * large colour singlet contribution. This will have a component with rapidity gaps, and a component where these gaps have been destroyed by UE.
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- | * large colour octet contribution enhanced by low x logs (Jeppes's calculations).
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- | 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.
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- | Not: addressed:
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- | * How dependent on matching strategy?
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- | * Are there ways of revamping pre-matched tunes?
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