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factorize breit wigner functions to provide method to calculate amp f… #328

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factorize breit wigner functions to provide method to calculate amp f… #328

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2913b6b
factorize breit wigner functions to provide method to calculate amp f…
lan13005 Apr 17, 2024
8db7a0f
fix methods namespace for BreitWigner3body
lan13005 Apr 17, 2024
bfbcd0a
fix calculation in BreitWigner3body
lan13005 Apr 17, 2024
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8 changes: 7 additions & 1 deletion src/libraries/AMPTOOLS_AMPS/BreitWigner.cc
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Expand Up @@ -61,7 +61,13 @@ BreitWigner::calcAmplitude( GDouble** pKin ) const
GDouble mass = Ptot.M();
GDouble mass1 = P1.M();
GDouble mass2 = P2.M();


return calcAmplitudeFromMasses( mass, mass1, mass2 );
}

complex< GDouble >
BreitWigner::calcAmplitudeFromMasses( GDouble mass, GDouble mass1, GDouble mass2 ) const
{
// assert positive breakup momenta
GDouble q0 = fabs( breakupMomentum(m_mass0, mass1, mass2) );
GDouble q = fabs( breakupMomentum(mass, mass1, mass2) );
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1 change: 1 addition & 0 deletions src/libraries/AMPTOOLS_AMPS/BreitWigner.h
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Expand Up @@ -36,6 +36,7 @@ class BreitWigner : public UserAmplitude< BreitWigner >
string name() const { return "BreitWigner"; }

complex< GDouble > calcAmplitude( GDouble** pKin ) const;
complex< GDouble > calcAmplitudeFromMasses( GDouble mass, GDouble mass1, GDouble mass2 ) const;

void updatePar( const AmpParameter& par );

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9 changes: 7 additions & 2 deletions src/libraries/AMPTOOLS_AMPS/BreitWigner3body.cc
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Expand Up @@ -46,9 +46,14 @@ BreitWigner3body::calcAmplitude( GDouble** pKin ) const

GDouble mass = Ptot.M();

return calcAmplitudeFromMasses( mass );
}

complex< GDouble >
BreitWigner3body::calcAmplitudeFromMasses( GDouble mass ) const
{
GDouble width = m_width0;
//GDouble width = m_width0;


// this first factor just gets normalization right for BW's that have
// no additional s-dependence from orbital L
complex<GDouble> bwtop( sqrt( m_mass0 * m_width0 / 3.1416 ), 0.0 );
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1 change: 1 addition & 0 deletions src/libraries/AMPTOOLS_AMPS/BreitWigner3body.h
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Expand Up @@ -36,6 +36,7 @@ class BreitWigner3body : public UserAmplitude< BreitWigner3body >
string name() const { return "BreitWigner3body"; }

complex< GDouble > calcAmplitude( GDouble** pKin ) const;
complex< GDouble > calcAmplitudeFromMasses( GDouble mass ) const;

void updatePar( const AmpParameter& par );

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