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EvtSVVHelCPMix.hh
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EvtSVVHelCPMix.hh
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/***********************************************************************
* Copyright 1998-2020 CERN for the benefit of the EvtGen authors *
* *
* This file is part of EvtGen. *
* *
* EvtGen is free software: you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation, either version 3 of the License, or *
* (at your option) any later version. *
* *
* EvtGen is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with EvtGen. If not, see <https://www.gnu.org/licenses/>. *
***********************************************************************/
#ifndef EVTSVVHELCPMIX_HH
#define EVTSVVHELCPMIX_HH
#include "EvtGenBase/EvtDecayAmp.hh"
//Class to handle decays of the form SCALAR -> VECTOR VECTOR
//according the the helicity amplitudes specified by the
//user. There are 6 arguements, orders as amplitude then
//phase for H+, H0, and H-, in that order.
//
// Description: Routine to decay scalar -> 2 vectors
// by specifying the helicity amplitudes, taking appropriate
// weak phases into account to get mixing and CP violation through
// interference. Based on EvtSVVHelAmp. Particularly appropriate for
// Bs->J/Psi+Phi
//
// Model takes the following as user-specified arguments:
// deltaM, averageM - mass diference and average of light and heavy mass eigenstates (real scalars)
// gamma, deltagamma - average width and width difference of the l and h eigenstates (real scalars)
// delta1, delta2 - strong phases (real scalars)
// direct weak phase (real scalar) (for Bs->JPsiPhi this will be zero)
// weak mixing phase (real scalar) (this is equal to 2*arg(Vts Vtb) for Bs->JPsiPhi)
// Magnitudes of helicity amplitudes as in SVV_HELAMP
// See Phys Rev D 34 p1404 - p1417 and chapters 5 and 7 of Physics Reports 370 p537-680 for more details
class EvtAmp;
class EvtParticle;
class EvtId;
class EvtSVVHelCPMix : public EvtDecayAmp {
public:
std::string getName() override;
EvtDecayBase* clone() override;
void init() override;
EvtComplex hp;
EvtComplex h0;
EvtComplex hm;
double averageM;
double deltaM;
double gamma;
double deltagamma;
EvtComplex strongphase1;
EvtComplex strongphase2;
EvtComplex weakmixingphase;
EvtComplex weakdirectphase;
void initProbMax() override;
void decay( EvtParticle* p ) override;
std::string getParamName( int i ) override;
std::string getParamDefault( int i ) override;
};
#endif

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