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Momentum Scaling + Smearing Patchs

Momentum Scaling + Smearing Patchs. M. Needham. Tutorial given in Software week. Users try to follow and run into problems This is bad and we should rectify quickly, else no one will use these tools Remember physicists are lazy, they make ntuples once for an analysis and will try to argue

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Momentum Scaling + Smearing Patchs

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  1. Momentum Scaling + Smearing Patchs M. Needham

  2. Tutorial given in Software week. Users try to follow and run into problems This is bad and we should rectify quickly, else no one will use these tools Remember physicists are lazy, they make ntuples once for an analysis and will try to argue at all costs they never need to do it again. So if this is not in place soon it will not be used for 2012 analysis (a pity) For sure there are some technical details and complications that need to be discussed and ironed out. This is the purpose of this talk…. Note tools have to be explicity run by the user, therefore they don’t disturb anything Introduction

  3. The tool is for data. No scaling for the MC is forseenat present. This could be done but the effect is small – 10-4 effects, uniform over phase space (why would you need this correction). In the future I could provide the map for MC12 (I have it for some iteration of this MC), but lets not complicate things now. Default is no calibration. A null slice is needed in SIMCOND. This was missing and means TrackScaleState could not be run (also does covariance scaleing which does have a MC slice). To fix this there is a patch in Savannah Momentum Scaling (MC) http://savannah.cern.ch/patch/?5632 Essentially CONDB should be mirrored in SIMCOND

  4. I have prepared the scaling for the 2011 reprocessing (Reco 14. Stripping 20), validity is 2011 Here the difficulty maybe that some users want to use the old patch (Reco 12, Stripping 17) and having the two patchs is not easy to do in current software. If there is a conflict then I think we have to assume that most people will use Reco 14, stripping 17.[This should be well advertized…] If people really need the old calibration I can provide the oldstyle workaround – ie I give you the old code and you load the histograms needed from my root file. [This is not so painful for users who really need this] The patch for the new momentum scaling is http://savannah.cern.ch/patch/?5633 Momentum Scaling: 2011

  5. This tool only came recently: need to checkout Phys/DaVinciTools to get at present. Will only come by default with new release This tool is a bit complicated in that its validity is strictly pairing a dataset and MC dataset Three sets have been provided A default null set A MC11a + Reco12 (stripping 17) set New: A MC11a + Reco 14 set (which probably works also for MC12) If again there are problems with versioning due to Reco dependence then I suggest to take the new MC11a + Reco14 set that can be found on the patch. It undersmears a bit for reco 12 (~ 2 -3 % effect) but is still an improvement. http://savannah.cern.ch/patch/?5634 Momentum Smearing

  6. Paul + Christian should comment Momentum error

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