EvtConExc.hh

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//--------------------------------------------------------------------------
//
// 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:  EvtConExc.hh
//
// Description: To define cross section for the continuum exclusive process
// Experimental cross section taken from PRD73,012005, PRD76,092006, also 
// see a review: Rev. Mod. Phys. 83,1545
  /*******************--- mode definition: also see EvtXsection.cc
  0: ppbar
  1: nnbar
  2: Lambda0 anti-Lambda0
  3: Sigma0 anti-Sigma0
  4: Lambda0 anti-Sigma0
  5: Sigma0 anti-Lambda0
  6: pi+ pi-
  7: pi+ pi- pi0
  8: K+K- pi0
  9: KsK+pi- 
  10: KsK-pi+
  11: K+K-eta
  12: 2(pi+pi-)
  13: pi+pi-2pi0
  14: K+K-pi+pi-
  15: K+K-2pi0
  16: 2(K+K-)
  17: 2(pi+pi-)pi0
  18: 2(pi+pi-)eta
  19: K+K-pi+pi-pi0         
  20: K+K-pi+pi-eta
  21: 3(pi+pi-)
  22: 2(pi+pi-pi0)
  23: phi eta
  24: phi pi0
  25: K+K*-
  26: K-K*+
  27: K_SK*0-bar
  28: K*0(892)K+pi-
  29: K*0(892)K-pi+
  30: K*+K-pi0
  31: K*-K+pi0
  32: K_2*(1430)0 K+pi-
  33: K_2*(1430)0 K-pi+
  34: K+K-rho
  35: phi pi+pi-
  36: phi f0(980)
  37: eta pi+pi-
  38: omega pi+ pi-
  39: omega f0(980)
  40: eta' pi+ pi-
  41: f_1(1285)pi+pi-
  42: omega K+K-
  43: omega pi+pi-pi0  
  *************************************/
// Modification history:
//
//    Ping R.-G.       Nov., 2012       Module created
//
//------------------------------------------------------------------------
//
#ifndef EVTCONEXC_HH
#define EVTCONEXC_HH 
 
//#include <string.h>
#include "EvtGenBase/EvtId.hh"
#include "EvtGenBase/EvtDecayIncoherent.hh"
#include "EvtGenModels/EvtXsection.hh"
//------ including root  
#include "TH1.h" 
#include "TH2.h"
#include "TH3.h"
#include "TFile.h"  
#include "TROOT.h" 
#include "TTree.h"
#include "TGraphErrors.h"
#include "TDirectory.h"
 
class EvtParticle;
 
class EvtConExc:public  EvtDecayIncoherent  {
 
public:
  
  EvtConExc() {
  } //constructor
  //---
  virtual ~EvtConExc();
 
  void getName(std::string& name);
 
  EvtDecayBase* clone();
 
  void initProbMax();
 
  void init();
  void init_Br_ee();
 
  void decay(EvtParticle *p); 
  void init_mode(int mode);
  double gamHXSection(EvtParticle* p, double El, double Eh, int nmc=100000);
  double gamHXSection(double s, double El, double Eh, int nmc=100000);
  double gamHXSection(double El, double Eh);
  double gamHXSection_er(double El,double Eh);
 
  void  findMaxXS(EvtParticle *p);
  double difgamXs(EvtParticle* p); //differential cross section for gamma + hadrons
  bool gam_sampling(EvtParticle *p);
  bool xs_sampling(double xs);
  bool baryon_sampling(EvtVector4R pcm, EvtVector4R pi);//baryon angular distri. 1+cos^2\theta
  bool meson_sampling(EvtVector4R pcm, EvtVector4R pi); //meson angular distri. sin^2\theta
  double Rad1(double s, double x);
  double Rad2(double s, double x);
  double Rad2difXs(EvtParticle *p);
  double Rad2difXs(double s, double x);
  double Rad1difXs(EvtParticle *p);
  double Ros_xs(double mx, double bree,EvtId pid);
  static EvtXsection *myxsection;
  static double _cms; //energy of CMS of ee beam
  static double XS_max;// maxium of cross section in experiment
 
  static int getMode;
  double Li2(double x);
  double SoftPhoton_xs(double s,double b);
private:
 
  int _mode,_ndaugs,radflag;
  EvtId daugs[10],gamId;//daugs[0]~dagus[_ndaugs-1] are hadrons, daugs[_ndaugs] is ISR gamma
  static double _xs0,_xs1; //cross section for 0 and 1-photon processes
  static double _er0,_er1; //cross section for 0 and 1-photon processes
  static int _nevt;
 
  EvtParticle* gamH;
  double maxXS;//maximum of diffrential cross section respective to cos\theta and mhds for ee->gamma hadrons
  double differ,differ2,Rad2Xs;
  std::string _unit;
  std::vector<double> BR_ee;
  std::vector<EvtId > ResId;
 
  //-- for deguggint to make root file
  TFile *myfile;
  Double_t pgam[4],phds[4],ph1[4],ph2[4],mhds;
  Double_t mass1,mass2;
  Int_t imode;
  TTree *xs;
  bool mydbg; //handler w/o debugging
  TGraphErrors *mygr;
  TH1F* myth;
  // for calulate the correction factor
  int pdgcode;
  std::string file;
  EvtId son[10],pid;
  int nson;
};
 
#endif