Differences

This shows you the differences between two versions of the page.

--- users:ngadiuba:tools:puweightrecipe [2014/04/15 14:10] – ngadiuba
+++ users:ngadiuba:tools:puweightrecipe [2014/04/15 14:34] (current) – ngadiuba
@@ Line 18: / Line 18: @@
 ===== How to calculate weights =====
-  * Get the MC PU distribution from here
+  * Get the MC PU distribution for the scenario of interest from [[https://twiki.cern.ch/twiki/bin/viewauth/CMS/Pileup_MC_Gen_Scenarios|here]]
+  * Then calculate the weights using the true number of PU interactions for the in-time bunch crossing. This information is extracted in CMSSW as follows
+   Handle<std::vector< PileupSummaryInfo > >  PupInfo;
+   event.getByLabel(edm::InputTag("addPileupInfo"), PupInfo);
+   std::vector<PileupSummaryInfo>::const_iterator PVI;
+   float Tnpv = -1;
+   for(PVI = PupInfo->begin(); PVI != PupInfo->end(); ++PVI) {
+      int BX = PVI->getBunchCrossing();
+      if(BX == 0) {
+        Tnpv = PVI->getTrueNumInteractions();
+        continue;
+      }
+   }
+===== PUweight class for SFrame =====
+  * [[users:ngadiuba:tools:puweightrecipe:puweighth|PUWeight.h]]
+  * [[users:ngadiuba:tools:puweightrecipe:puweightcxx|PUWeight.cxx]]

CMS Wiki Pages