#include "TLorentzVector.h"
class MyF {
  
 public:
  
  //--------------------------------------------------------------------------
  //..FourMomentum returns four vector from p, Cos(theta), phi and mass

  static TLorentzVector FourMomentum(Float_t mom, Float_t costheta, 
				     Float_t phi, Float_t mass);  
  
};