Difference: AtlasDataAnalysis (98 vs. 99)

Revision 992011-08-14 - AlistairGemmell

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Computentp, Neural Nets and MCLIMITS

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Filters

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It is possible for the inputs to the ANN to have more events in than those that you want to pass to on for processing. We only want to train the ANN on those samples that would pass our preselection cuts and have 'sensible states'. The preselection cuts are easy enough to understand - they merely clean the sample - events which fail these are set to zero. However, it is possible for some events to have pass the cuts, but still not be anything like that which we would want (e.g. there is no way to reconstruct a top with a realistic mass). Seeing as it is likely that the backgrounds have more of these non-sensible states, to include them would be to give the ANN an unfair advantage in determining signal from background. But we don't want to simply set them equal to zero, as at other times we are going to be interested in how events passing preselection can fail to have sensible states, and so will want to examine them further. We therefore have filters so that Computentp and the ANN only look at events of our choosing. These filters take the place of various bitwise tests in genemflat_batch_Complete2.sh (not currently used, as explained below) and TreeSpecATLAStth.txt.
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It is possible for the inputs to the ANN to have more events in than those that you want to pass to on for processing. We only want to train the ANN on those samples that would pass our preselection cuts - general cleaning cuts and the like. (There was a previous version of our inputs where we also required 'sensible states' - for each candidate event we required it to reconstruct tops and Ws with vaguely realistic masses. However - this is a Neural Net analysis, so it has been decided to remove these cuts - they will after all in effect be reintroduced by the net itself if they would have been useful, and by not applying them ourselves, we are passing more information to the net.) We therefore have filters so that Computentp and the ANN only look at events of our choosing. These filters take the place of various bitwise tests in genemflat_batch_Complete2.sh (not currently used, as explained below) and TreeSpecATLAStth.txt.
  In TreeSpecATLAStth.txt the filters control what is used for the templating, and Computentp:
 
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