Add nu Q2 x plots for simulation

Add nu Q2 x plots for simulation Will re-write jpsi kinematics in a simplified way (like nu Q2 x) Will re-write the plotting part to factorize out code

dvmp/analysis/util.h

@@ -159,28 +159,28 @@ get_y(const std::pair<ROOT::Math::PxPyPzMVector, ROOT::Math::PxPyPzMVector>&
 //========================================================================================================
 //for structure functions
 
-struct structure_func{    //add more when needed
+struct inv_quant{    //add more when needed
     double nu, Q2, x;
 };
 
 //for simu
-inline structure_func calc_structure_func_simu(const std::vector<ROOT::Math::PxPyPzMVector>& parts){
+inline inv_quant calc_inv_quant_simu(const std::vector<ROOT::Math::PxPyPzMVector>& parts){
   ROOT::Math::PxPyPzMVector q(parts[0] - parts[2]);
   ROOT::Math::PxPyPzMVector P(parts[3]);
   
   double nu = q.Dot(P) / P.mass();
   double Q2 = - q.Dot(q);  
-  structure_func quantities = {nu, Q2, Q2/2./P.mass()/nu};
+  inv_quant quantities = {nu, Q2, Q2/2./P.mass()/nu};
   return quantities;
 }
 
-inline double get_nu_simu(structure_func quantities) {
+inline double get_nu_simu(inv_quant quantities) {
   return quantities.nu/1000.;
 }
-inline double get_Q2_simu(structure_func quantities) {
+inline double get_Q2_simu(inv_quant quantities) {
   return quantities.Q2;
 }
-inline double get_x_simu(structure_func quantities) {
+inline double get_x_simu(inv_quant quantities) {
   return quantities.x;
 }