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2015:groups:sm:wmass [2015/06/04 14:47]
luca.perrozzi [Theory uncertainties for W mass measurement]
2015:groups:sm:wmass [2015/07/14 08:28] (current)
philippe.gras Added instructions for CERN account
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 ====== Theory uncertainties for W mass measurement ====== ====== Theory uncertainties for W mass measurement ======
 +
 +//If you are interested in contributing please subscribe to the [[https://​e-groups.cern.ch/​e-groups/​EgroupsSearch.do?​searchValue=houches-2015-topics-sm-wmass|mailing list]]. You will be asked to log in with your CERN account. If you don't have a CERN account, please fill [[https://​account.cern.ch/​account/​Externals/​RegisterAccount.aspx|this form]] to create a lightweight account.//
 +
 Andre David, Fulvio Piccinini, Luca Perrozzi, Mariarosaria D'​Alfonso,​ Gigi Rolandi, Josh Bendavid, Andre David, Fulvio Piccinini, Luca Perrozzi, Mariarosaria D'​Alfonso,​ Gigi Rolandi, Josh Bendavid,
 Alessandro Vicini, Carlo Oleari, ... Alessandro Vicini, Carlo Oleari, ...
 +
 +[[http://​phystev.cnrs.fr/​wiki/?​ns=2015%3Agroups%3Asm%3A&​image=2015%3Agroups%3Asm%3Aw_mass_at_les_houches.pdf&​do=media|Presentation at Les Houches]]
  
 Goal: discuss the relevant theory uncertainties for W mass measurement,​ trying to come up Goal: discuss the relevant theory uncertainties for W mass measurement,​ trying to come up
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 Starting point: theory uncertainties as defined in Tevatron analyses likely to be very aggressive Starting point: theory uncertainties as defined in Tevatron analyses likely to be very aggressive
 +
 +Vidyo link to connect from outside Les Houches: http://​vidyoportal.cern.ch/​flex.html?​roomdirect.html&​key=v5QzoUCLTk5TMhuubxqNMEQe7j0
 ==== PDF uncertainties ==== ==== PDF uncertainties ====
  
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 ==== Boson pT ==== ==== Boson pT ====
  
 +QCD non perturbative scale choice at Tevatron driven by fit on Z data.
  
 +QCD perturbative scale variation not taken into account at Tevatron.
 +Fully uncorrelated scale variation would lead to several tens of MeV uncertainty.
 +Is it possible to use Z data to (at least partially) constraint the W pT?
 +
 +Summary of the discussion
 +
 +{{:​2015:​groups:​sm:​wmass_les_hoches.jpg?​300|}}
 +
 +Apart from NLO+PS combinations like POWHEG+Pythia,​
 +how to take into account higher order corrections
 +from codes like the NNLO+NNLL DYRES?
 +Reweighting?​ Tuning?
 +
 +Do we need to consider the propagation of UE uncertainties?​
 ==== Correlations ==== ==== Correlations ====
 +
 +PDF, Underlying event, QCD soft scale resummation and perturbative scales, polarization uncertainties are correlated.
 +
 +How to handle them properly?
 +
 +Would it be possible to remove datasets from PDF "on demand"?​
 +(for instance, no W charge asymmetry)
2015/groups/sm/wmass.1433422046.txt.gz ยท Last modified: 2015/06/04 14:47 by luca.perrozzi