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

include/util.h

@@ -82,11 +82,11 @@ namespace util {
   {
     std::vector<ROOT::Math::PxPyPzMVector> momenta{parts.size()};
     // transform our raw tracker info into proper 4-momenta
-    std::transform(parts.begin(), parts.end(), momenta.begin(), [](const auto& parts) {
-      const double px = parts.p.x;
-      const double py = parts.p.y;
-      const double pz = parts.p.z;
-      return ROOT::Math::PxPyPzMVector{px, py, pz, parts.mass};
+    std::transform(parts.begin(), parts.end(), momenta.begin(), [](const auto& part) {
+      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};
     });
     return momenta;
   }