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// -*- C++ -*-
//
// This is the implementation of the non-inlined, non-templated member
// functions of the MixedParticleData class.
//
#include "MixedParticleData.h"
#include "ThePEG/Interface/Parameter.h"
#include "ThePEG/Interface/ClassDocumentation.h"
#include "ThePEG/Persistency/PersistentOStream.h"
#include "ThePEG/Persistency/PersistentIStream.h"
#include "ThePEG/Repository/EventGenerator.h"
#include "ThePEG/Repository/UseRandom.h"
#include "ThePEG/Utilities/Debug.h"
using namespace ThePEG;
void MixedParticleData::persistentOutput(PersistentOStream & os) const {
os << ounit(_deltam,GeV) << ounit(_deltagamma,GeV) << _pqmag << _pqphase
<< _pq << _zmag << _zphase << _z << _x << _y << _prob;
}
void MixedParticleData::persistentInput(PersistentIStream & is, int) {
is >> iunit(_deltam,GeV) >> iunit(_deltagamma,GeV) >> _pqmag >> _pqphase
>> _pq >> _zmag >> _zphase >> _z >> _x >> _y >> _prob;
}
ClassDescription<MixedParticleData> MixedParticleData::initMixedParticleData;
// Definition of the static class description member.
void MixedParticleData::Init() {
static ClassDocumentation<MixedParticleData> documentation
("The MixedParticleData class provides storage of the particle data"
" for particles which undergo mixing.");
static Parameter<MixedParticleData,Energy> interfaceDeltaM
("DeltaM",
"The mass difference",
&MixedParticleData::_deltam, GeV, 0.0*GeV, 0.0*GeV, 1.*GeV,
false, false, Interface::limited,
&MixedParticleData::setDeltaM, 0, 0, 0, 0);
static Parameter<MixedParticleData,Energy> interfaceDeltaGamma
("DeltaGamma",
"The width difference",
&MixedParticleData::_deltagamma, GeV, 0.0*GeV, 0.0*GeV, 1.0*GeV,
false, false, Interface::limited,
&MixedParticleData::setDeltaGamma, 0, 0, 0, 0);
static Parameter<MixedParticleData,double> interfacePQMagnitude
("PQMagnitude",
"The value of |p/q|",
&MixedParticleData::_pqmag, 1.0, 0.0, 10.0,
false, false, Interface::limited,
&MixedParticleData::setPQMagnitude, 0, 0, 0, 0);
static Parameter<MixedParticleData,double> interfacePQPhase
("PQPhase",
"The phase of p/q",
&MixedParticleData::_pqmag, 0.0, 0.0, 2.*Constants::pi,
false, false, Interface::limited,
&MixedParticleData::setPQPhase, 0, 0, 0, 0);
static Parameter<MixedParticleData,double> interfaceZMagnitude
("ZMagnitude",
"The value of |z|",
&MixedParticleData::_zmag, 0.0, 0.0, 1.0,
false, false, Interface::limited,
&MixedParticleData::setZMagnitude, 0, 0, 0, 0);
static Parameter<MixedParticleData,double> interfaceZPhase
("ZPhase",
"The phase of z",
&MixedParticleData::_zmag, 0.0, 0.0, 2.*Constants::pi,
false, false, Interface::limited,
&MixedParticleData::setZPhase, 0, 0, 0, 0);
}
MixedParticleData::MixedParticleData(long newId, string newPDGName)
: ParticleData(newId, newPDGName), _deltam(0.*GeV), _deltagamma(0.*GeV),
_pqmag(1.), _pqphase(0.), _pq(1.,0.), _zmag(0.), _zphase(0.), _z(0.),
_x(0.), _y(0.), _prob(make_pair(1.,0.)) {}
PDPtr MixedParticleData::
Create(long newId, string newPDGName) {
return new_ptr(MixedParticleData(newId, newPDGName));
}
PDPair MixedParticleData::
Create(long newId, string newPDGName, string newAntiPDGName) {
PDPair pap;
pap.first = new_ptr(MixedParticleData(newId, newPDGName));
pap.second = new_ptr(MixedParticleData(-newId, newAntiPDGName));
antiSetup(pap);
return pap;
}
PDPtr MixedParticleData::pdclone() const {
return new_ptr(*this);
}
void MixedParticleData::setDeltaM(Energy m) {
_deltam = m;
MixedParticleData * apd =
dynamic_cast<MixedParticleData*>(CC().operator->());
if ( synchronized() && apd ) apd->_deltam = m;
}
void MixedParticleData::setDeltaGamma(Energy m) {
_deltagamma = m;
MixedParticleData * apd =
dynamic_cast<MixedParticleData*>(CC().operator->());
if ( synchronized() && apd ) apd->_deltagamma = m;
}
void MixedParticleData::setPQMagnitude(double m) {
_pqmag = m;
MixedParticleData * apd =
dynamic_cast<MixedParticleData*>(CC().operator->());
if ( synchronized() && apd ) apd->_pqmag = m;
}
void MixedParticleData::setPQPhase(double m) {
_pqphase = m;
MixedParticleData * apd =
dynamic_cast<MixedParticleData*>(CC().operator->());
if ( synchronized() && apd ) apd->_pqphase = m;
}
void MixedParticleData::setZMagnitude(double m) {
_zmag = m;
MixedParticleData * apd =
dynamic_cast<MixedParticleData*>(CC().operator->());
if ( synchronized() && apd ) apd->_zmag = m;
}
void MixedParticleData::setZPhase(double m) {
_zphase = m;
MixedParticleData * apd =
dynamic_cast<MixedParticleData*>(CC().operator->());
if ( synchronized() && apd ) apd->_zphase = m;
}
void MixedParticleData::doinit() throw(InitException) {
ParticleData::doinit();
// calculate the complex parameters from the magnitudes and phases
// and x and y from massive parameters
// p/q
_pq = _pqmag*Complex(cos(_pqphase),sin(_pqphase));
// z
_z = _zmag *Complex(cos(_zphase ),sin(_zphase ));
// x
_x = _deltam /width();
// y
_y = 0.5*_deltagamma/width();
// probabilities
double zr = _z.real(), zi = _z.imag();
double root = sqrt( (1 - 2 * zr * zr + 2 * zi * zi + pow( zr, 4)
+ 2 * zr * zr * zi * zi + pow( zi, 4)));
double x2=sqr(_x),y2=sqr(_y),modqp=1./sqr(abs(_pq)),z2(sqr(zr)+sqr(zi));
double mixprob = id()>0 ?
-modqp*root*(x2+y2)/(2*zr*_y*(1+x2) - modqp*root*(x2+y2)
- (1.+z2)*x2 - 2*zi*_x*(1-y2) + y2*(1-z2) - 2) :
root*(x2+y2)/(2*modqp*zr*(1+x2)*_y+root*(x2+y2)+modqp*(1.+z2)*x2
- 2*modqp*zi*_x*(1-y2)-modqp*y2*(1-z2)+2*modqp);
_prob= make_pair(1.-mixprob,mixprob);
if( Debug::level ) {
generator()->log() << "Parameters for the mixing of " << PDGName() << " and "
<< CC()->PDGName() << "\n";
generator()->log() << "x = " << _x << "\t y = " << _y << "\n";
generator()->log() << "Integrated mixing probability = " << mixprob << "\n";
}
}
pair<bool,Length> MixedParticleData::generateLifeTime() const {
// first decide if mixes
bool mix = UseRandom::rndbool(_prob.second);
double wgt;
Length ct;
double zi(_z.imag()),zr(_z.real()),zabs(sqr(zi)+sqr(zr)),
root(1.-zabs);
Length ctau = hbarc/(width()-0.5*abs(_deltagamma));
do {
ct = UseRandom::rndExp(ctau);
double gt = ct/cTau();
wgt=1.;
if(id()>0) {
if(!mix) {
wgt = 0.5*(1.+zabs)*cosh(_y*gt)+0.5*(1.-zabs)*cos(_x*gt)
-zr*sinh(_y*gt)+zi*sin(_x*gt);
}
else {
wgt = 0.5*root/sqr(abs(_pq))*(cosh(_y*gt)-cos(_x*gt));
}
}
else {
if(!mix) {
wgt = 0.5*(1.+zabs)*cosh(_y*gt)+0.5*(1.-zabs)*cos(_x*gt)
+zr*sinh(_y*gt)-zi*sin(_x*gt);
}
else {
wgt = 0.5*root*sqr(abs(_pq))*(cosh(_y*gt)-cos(_x*gt));
}
}
wgt *= exp(-gt+ct/ctau);
}
while(UseRandom::rnd()>wgt);
return make_pair(mix,ct);
}
pair<Complex,Complex> MixedParticleData::mixingAmplitudes(Length ct,bool part) const {
double gt = ct/cTau();
Complex ep = exp(Complex(-0.5*_y,-0.5*_x)*gt);
Complex gp = 0.5*(ep+1./ep), gm = 0.5*(ep-1./ep);
pair<Complex,Complex> output;
if(part) {
output.first = gp + _z*gm;
output.second = -sqrt(1.-sqr(_z))/_pq*gm;
}
else {
output.first = gp - _z*gm;
output.second = -sqrt(1.-sqr(_z))*_pq*gm;
}
return output;
}
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