Add J/psi resolution; re-write RC with Dummy instead of rc tracks

include/util.h

@@ -86,7 +86,8 @@ namespace util {
       const double px = part.p.x;
       const double py = part.p.y;
       const double pz = part.p.z;
-      return ROOT::Math::PxPyPzMVector{px, py, pz, part.mass};
+      const double mass = part.mass;
+      return ROOT::Math::PxPyPzMVector{px, py, pz, mass};
     });
     return momenta;
   }