EvtHelSys.hh

Go to the documentation of this file.

//--------------------------------------------------------------------------
//
// Environment:
//      This software is part of models developed at BES collaboration
//      based on the EvtGen framework.  If you use all or part
//      of it, please give an appropriate acknowledgement.
//
// Copyright Information: See EvtGen/BesCopyright
//      Copyright (A) 2006      Ping Rong-Gang @IHEP
//
// Module:  EvtDIY.cc
//
// Description:  Class to boost a daughter momentum into the mother helicity system
//
// Modification history:
//
//    Ping R.-G.       December, 2006       Module created
//
//------------------------------------------------------------------------
//
 
#ifndef EVTHELSYS_HH
#define EVTHELSYS_HH
 
// #include "EvtPatches.hh"
#include <iostream>
// #include <math.h>
#include "EvtComplex.hh"
#include "EvtVector3R.hh"
#include "EvtVector4R.hh"
 
#include <fstream>
// #include <stdio.h>
// #include <stdlib.h>
// #include <sys/stat.h>
// #include "EvtParticle.hh"
// #include "EvtReport.hh"
// #include "EvtCPUtil.hh"
// #include "EvtParticleFactory.hh"
 
using std::endl;
using std::fstream;
EvtComplex Djmn( int j, int m, int n, double phi, double theta, double gamma );
class EvtHelSys {
 
  friend double     djmn( int j, int m, int n, double theta );
  friend double     djmn( double j, double m, double n, double theta );
  friend EvtComplex Djmn( int j, int m, int n, double phi, double theta, double gamma );
  friend EvtComplex Djmn( double j, double m, double n, double phi, double theta,
                          double gamma );
 
public:
  // destructor
  virtual ~EvtHelSys();
 
  // constructor
  EvtHelSys();
  EvtHelSys( const EvtVector4R& p4p, const EvtVector4R& p4d );
 
  double getHelAng( int i ), Angles( EvtVector4R, int );
 
  EvtVector4R checkparent(), checkdaug(), checkst( int i );
 
  EvtVector4R Helrotate( EvtVector4R p1, double phi, double theta );
 
private:
  EvtVector4R _p4parent, _p4daug, _bp4p, _rotatep4p, _rotatep4d, _bst;
};
 
#endif