EvtTSS.cc

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//--------------------------------------------------------------------------
//
// Environment:
//      This software is part of the EvtGen package developed jointly
//      for the BaBar and CLEO collaborations.  If you use all or part
//      of it, please give an appropriate acknowledgement.
//
// Copyright Information: See EvtGen/COPYRIGHT
//      Copyright (C) 1998      Caltech, UCSB
//
// Module: EvtTSS.cc
//
// Description: Routine to decay tensor-> scalar scalar
//
// Modification history:
//
//    RYD     November 24, 1996         Module created
//
//------------------------------------------------------------------------
// -*- C++ -*-
//
// Package:     EVT
// Module:      EvtTSS
//
//
// Implimentation:
//
//
// Author:      ryd
// Created:     Nov 24, 1996
//
//
#include "EvtTSS.hh"
#include "../EvtGenBase/EvtGenKine.hh"
#include "../EvtGenBase/EvtPDL.hh"
#include "../EvtGenBase/EvtParticle.hh"
#include "../EvtGenBase/EvtPatches.hh"
#include "../EvtGenBase/EvtReport.hh"
#include "../EvtGenBase/EvtTensor4C.hh"
#include "../EvtGenBase/EvtVector4C.hh"
#include <stdlib.h>
#include <string>
 
EvtTSS::~EvtTSS() {}
 
void EvtTSS::getName( std::string& model_name ) { model_name = "TSS"; }
 
EvtDecayBase* EvtTSS::clone() { return new EvtTSS; }
 
void EvtTSS::init() {
 
  // check that there are 0 arguments
  checkNArg( 0 );
 
  checkNDaug( 2 );
 
  checkSpinParent( EvtSpinType::TENSOR );
 
  checkSpinDaughter( 0, EvtSpinType::SCALAR );
  checkSpinDaughter( 1, EvtSpinType::SCALAR );
}
 
void EvtTSS::initProbMax() { setProbMax( 1.0 ); }
 
void EvtTSS::decay( EvtParticle* p ) {
 
  p->initializePhaseSpace( getNDaug(), getDaugs() );
 
  EvtVector4R moms1 = p->getDaug( 0 )->getP4();
 
  double norm = 1.0 / ( moms1.d3mag() * moms1.d3mag() );
 
  vertex( 0, norm * ( p->epsTensor( 0 ).cont1( EvtVector4C( moms1 ) ) * ( moms1 ) ) );
  vertex( 1, norm * ( p->epsTensor( 1 ).cont1( EvtVector4C( moms1 ) ) * ( moms1 ) ) );
  vertex( 2, norm * ( p->epsTensor( 2 ).cont1( EvtVector4C( moms1 ) ) * ( moms1 ) ) );
  vertex( 3, norm * ( p->epsTensor( 3 ).cont1( EvtVector4C( moms1 ) ) * ( moms1 ) ) );
  vertex( 4, norm * ( p->epsTensor( 4 ).cont1( EvtVector4C( moms1 ) ) * ( moms1 ) ) );
 
  return;
}