2015:groups:sm:wmass
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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 ====== | ||
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| + | //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.// | ||
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| 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, ... | ||
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| + | [[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 | ||
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| + | 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? | ||
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| + | Summary of the discussion | ||
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| + | {{:2015:groups:sm:wmass_les_hoches.jpg?300|}} | ||
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| + | 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? | ||
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| + | Do we need to consider the propagation of UE uncertainties? | ||
| ==== Correlations ==== | ==== Correlations ==== | ||
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| + | PDF, Underlying event, QCD soft scale resummation and perturbative scales, polarization uncertainties are correlated. | ||
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| + | How to handle them properly? | ||
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| + | 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
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