Replacing nu with y

benchmarks/dvmp/analysis/dvmp.h

@@ -29,7 +29,8 @@ namespace util {
   {
     ROOT::Math::PxPyPzMVector q(parts[0] - parts[2]);
     ROOT::Math::PxPyPzMVector P(parts[3]);
-    ROOT::Math::PxPyPzMVector Delta(parts[6] - parts[3]);//exact P' - P
+    //ROOT::Math::PxPyPzMVector Delta(parts[6] - parts[3]);//exact P' - P
+    ROOT::Math::PxPyPzMVector Delta(parts[0] - parts[2] - parts[5]);//e - e' - jpsi
     //ROOT::Math::PxPyPzMVector Delta(parts[0] - parts[2] - parts[7] - parts[8]);//jpsi->l l' gamma, ignore gamma
 
     double    nu         = q.Dot(P) / P.mass();