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FS_QtildaShowerKinematics1to2.cc
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FS_QtildaShowerKinematics1to2.cc
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// -*- C++ -*-
//
// This is the implementation of the non-inlined, non-templated member
// functions of the FS_QtildaShowerKinematics1to2 class.
//
#include "FS_QtildaShowerKinematics1to2.h"
#include "Herwig++/Utilities/HwDebug.h"
#include "ThePEG/Repository/EventGenerator.h"
#include "ThePEG/Repository/CurrentGenerator.h"
using namespace Herwig;
FS_QtildaShowerKinematics1to2::~FS_QtildaShowerKinematics1to2() {}
void FS_QtildaShowerKinematics1to2::
updateChildren( const double parentSudAlpha, const Energy parentSudPx,
const Energy parentSudPy, vector<double> & sudAlphaVect,
vector<Energy> & sudPxVect, vector<Energy> & sudPyVect ) {
// this version is not called! only the next method!
double dqtilde = qtilde();
double dz = z();
double dphi = phi();
double dm2 = pVector().mass2();
// if ( HERWIG_DEBUG_LEVEL >= HwDebug::full_Shower ) {
// CurrentGenerator::log() << "FS_QtildaShowerKinematics1to2::updateChildren() "
// << " ===> START DEBUGGING <=== "
// << endl;
// }
// check phase space, ie whether we have a negative radical or not.
if ( sqr( dz*dqtilde ) - dm2 < 0 ) {
CurrentGenerator::log() << "FS_QtildaShowerKinematics1to2::updateChildren(): "
<< "Warning! Cannot reconstruct p_perp, z > sqrt(m2/qtilda2)!"
<< endl;
}
// dump all input
if ( HERWIG_DEBUG_LEVEL >= HwDebug::extreme_Shower ) {
CurrentGenerator::log() << "FS_QtildaShowerKinematics1to2::updateChildren() extreme ________________________"
<< endl
<< " called with (qtilde, z, phi) = ("
<< dqtilde << ", " << dz << ", " << dphi << ") " << endl
<< " input (alpha, px, py) = ("
<< parentSudAlpha << ", "
<< parentSudPx << ", " << parentSudPy << ")" << endl;
}
// determine alphas of children according to interpretation of z
sudAlphaVect.clear();
sudPxVect.clear();
sudPyVect.clear();
sudAlphaVect.push_back( dz*parentSudAlpha );
sudAlphaVect.push_back( (1.-dz)*parentSudAlpha );
// // determine transverse momenta of children
Energy pPerp;
if ( sqr( dz*dqtilde ) - dm2 > 0 ) {
pPerp = (1.-dz)*sqrt( sqr( dz*dqtilde ) - dm2);
} else {
// *** ACHTUNG! *** enforce 'in-phase-space' for the moment..."
pPerp = 0;
// *** ACHTUNG! *** replace with proper debug stuff... after
// proper interfacing.
CurrentGenerator::log() << "FS_QtildaShowerKinematics1to2::updateChildren()"
<< "Warning! Can't get p_perp, " << endl
<< " z = "
<< dz << " < sqrt(m2/qtilda2) = sqrt("
<< dm2 << "/" << sqr(dqtilde) << ") = "
<< sqrt(dm2)/dqtilde << "!" << endl;
}
sudPxVect.push_back( pPerp*cos(dphi) + dz*parentSudPx );
sudPyVect.push_back( pPerp*sin(dphi) + dz*parentSudPy );
sudPxVect.push_back( - pPerp*cos(dphi) + (1.-dz)*parentSudPx );
sudPyVect.push_back( - pPerp*sin(dphi) + (1.-dz)*parentSudPy );
// dump all output
if ( HERWIG_DEBUG_LEVEL >= HwDebug::extreme_Shower ) {
CurrentGenerator::log() << " result (alpha1, alpha2), pPerp = ("
<< sudAlphaVect[0] << ", " << sudAlphaVect[1] << "), "
<< pPerp << endl
<< " result (px1, py1), (px2, py2) = ("
<< sudPxVect[0] << ", " << sudPyVect[0] << "), ("
<< sudPxVect[1] << ", " << sudPyVect[1] << ")" << endl;
// << "FS_QtildaShowerKinematics1to2::updateChildren() "
// << "==> end extreme <== " << endl;
}
// if ( HERWIG_DEBUG_LEVEL >= HwDebug::full_Shower ) {
// CurrentGenerator::log() << "FS_QtildaShowerKinematics1to2::updateChildren() "
// << " ===> END DEBUGGING <=== " << endl;
// }
}
void FS_QtildaShowerKinematics1to2::updateChildren( const tShowerParticlePtr theParent,
const ParticleVector theChildren ) {
if (theChildren.size() != 2) {
CurrentGenerator::log() << "FS_QtildaShowerKinematics1to2::updateChildren() "
<< "Warning! too many children!" << endl;
} else {
ShowerParticlePtr c1 = dynamic_ptr_cast<ShowerParticlePtr>(theChildren[0]);
ShowerParticlePtr c2 = dynamic_ptr_cast<ShowerParticlePtr>(theChildren[1]);
double dqtilde = qtilde();
double dz = z();
double dphi = phi();
bool glueEmits = false;
bool gqq = false;
if ( theParent->data().id() == 21 ) glueEmits = true;
if ( theParent->data().id() == 21 && c1->data().id() == -c2->data().id() )
gqq = true;
if ( HERWIG_DEBUG_LEVEL >= HwDebug::extreme_Shower ) {
CurrentGenerator::log() << "FS_QtildaShowerKinematics1to2::updateChildren() extreme ________________________" << endl
<< " found " << theParent->data().PDGName()
<< "->" << c1->data().PDGName()
<< "+" << c2->data().PDGName()
<< ", i.e. gqq = " << (gqq ? "true" : "false")
<< endl
<< " called with (qtilde, z, phi) = ("
<< dqtilde << ", " << dz << ", " << dphi << ") " << endl
<< " input (alpha, px, py) = ("
<< theParent->sudAlpha() << ", "
<< theParent->sudPx() << ", "
<< theParent->sudPy() << ")" << endl;
}
// determine alphas of children according to interpretation of z
c1->sudAlpha( dz*theParent->sudAlpha() );
c2->sudAlpha( (1.-dz)*theParent->sudAlpha() );
// determine transverse momenta of children
Energy2 dm2 = Energy2();
Energy pPerp, kinCutoff;
// kinCutoff = .15*GeV;
// kinCutoff = kinScale();
bool inps = true;
if (glueEmits) {
// kinCutoff = (kinScale() - 0.15*c1->data().mass())/2.3;
kinCutoff = (kinScale() - 0.3*c1->data().mass())/2.3;
dm2 = sqr(max(kinCutoff, c1->data().mass()));
if ( sqr(dz*(1.-dz)*dqtilde) - dm2 > 0 )
pPerp = sqrt(sqr(dz*(1.-dz)*dqtilde) - dm2);
else inps = false;
} else {
// kinCutoff = (kinScale() - 0.15*theParent->data().mass())/2.3;
kinCutoff = (kinScale() - 0.3*theParent->data().mass())/2.3;
dm2 = sqr(max(kinCutoff, theParent->data().mass()));
if ( sqr(1.-dz)*(sqr( dz*dqtilde ) - dm2) > dz*sqr(kinCutoff) )
pPerp = sqrt( sqr(1.-dz)*(sqr( dz*dqtilde ) - dm2) - dz*sqr(kinCutoff) );
else inps = false;
}
if ( !inps ) {
// *** ACHTUNG! *** enforce 'in-phase-space' for the moment..."
pPerp = 0;
// *** ACHTUNG! *** replace with proper debug stuff... after
// proper interfacing.
CurrentGenerator::log() << "FS_QtildaShowerKinematics1to2::updateChildren()"
<< " Warning! Can't get p_perp, " << endl
<< " z = "
<< dz;
if (glueEmits) {
CurrentGenerator::log() << ", (m2, qt2) = ("
<< dm2 << ", " << sqr(dqtilde)
<< "), (z(1-z) qt)^2 = "
<< sqr(dz*(1.-dz)*dqtilde) << "!" << endl;
} else {
CurrentGenerator::log() << " < sqrt(m2/qtilda2) = sqrt("
<< dm2 << "/" << sqr(dqtilde) << ") = "
<< sqrt(dm2)/dqtilde << "!" << endl;
}
}
c1->sudPx( pPerp*cos(dphi) + dz*theParent->sudPx() );
c1->sudPy( pPerp*sin(dphi) + dz*theParent->sudPy() );
c2->sudPx( - pPerp*cos(dphi) + (1.-dz)*theParent->sudPx() );
c2->sudPy( - pPerp*sin(dphi) + (1.-dz)*theParent->sudPy() );
// dump all output
if ( HERWIG_DEBUG_LEVEL >= HwDebug::extreme_Shower ) {
CurrentGenerator::log() << " result (alpha1, alpha2), pPerp = ("
<< c1->sudAlpha() << ", "
<< c2->sudAlpha() << ", "
<< pPerp << endl
<< " result (px1, py1), (px2, py2) = ("
<< c1->sudPx() << ", "
<< c1->sudPy() << "), ("
<< c2->sudPx() << ", "
<< c2->sudPy() << ")"
<< endl
<< "FS_QtildaShowerKinematics1to2::updateChildren() "
<< "==> end extreme <== " << endl;
}
}
}
void FS_QtildaShowerKinematics1to2::
updateParent( const tShowerParticlePtr theParent,
const ParticleVector theChildren ) {
if (theChildren.size() != 2) {
CurrentGenerator::log() << "FS_QtildaShowerKinematics1to2::updateParent() "
<< "Warning! too many children!" << endl;
} else {
ShowerParticlePtr c1 = dynamic_ptr_cast<ShowerParticlePtr>(theChildren[0]);
ShowerParticlePtr c2 = dynamic_ptr_cast<ShowerParticlePtr>(theChildren[1]);
theParent->sudBeta( c1->sudBeta() + c2->sudBeta() );
theParent->set5Momentum( c1->momentum() + c2->momentum() );
if ( HERWIG_DEBUG_LEVEL >= HwDebug::full_Shower ) {
CurrentGenerator::log() << "FS_QtildaShowerKinematics1to2::updateParent(): full ____________________________"
<< endl
<< " set beta = " << theParent->sudBeta()
<< " = "
<< c1->sudBeta()
<< " + "
<< c2->sudBeta() << "."
<< endl
<< " set q = " << theParent->momentum()
<< endl
<< " = " << c1->momentum()
<< endl
<< " + " << c2->momentum()
<< endl
<< " q_sud = "
<< sudakov2Momentum( theParent->sudAlpha(),
theParent->sudBeta(),
theParent->sudPx(),
theParent->sudPy() )
<< " from Sudakov variables."
<< endl;
}
}
}
void FS_QtildaShowerKinematics1to2::updateLast( const tShowerParticlePtr theLast ) {
// set beta component and consequently all missing data from that,
// using the nominal (i.e. PDT) mass.
Energy theMass;
if ( theLast->data().id() == 21 ) theMass = theLast->momentum().mass();
// else theMass = theLast->data().mass();
// use constituent mass also for quarks. This on-shell condition belongs to
// NP hadronization!
else theMass = theLast->data().constituentMass();
theLast->sudBeta( (sqr(theMass) + theLast->sudPperp2()
- sqr( theLast->sudAlpha() )*_pVector.m2())
/ ( 2.*theLast->sudAlpha()*_pVector*_nVector ) );
if ( HERWIG_DEBUG_LEVEL >= HwDebug::full_Shower ) {
CurrentGenerator::log() << "FS_QtildaShowerKinematics1to2::updateLast(): full ______________________________"
<< endl
<< " set beta = " << theLast->sudBeta()
<< endl
<< " used (sqrt(q2)=m, alpha, perp2, p.n) = ("
<< theMass << ", "
<< theLast->sudAlpha() << ", "
<< theLast->sudPperp2() << ", "
<< _pVector*_nVector << ")"
<< endl;
}
// set that new momentum
theLast->set5Momentum( sudakov2Momentum( theLast->sudAlpha(), theLast->sudBeta(),
theLast->sudPx(), theLast->sudPy() ) );
// gives error message (note that we usually avoid the 5th component
// anyway) theLast->momentum().setMass(theMass);
}
Energy FS_QtildaShowerKinematics1to2::jetMass() {
Energy mass = Energy();
//***LOOKHERE*** WRITE THE CODE
return mass;
}

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