FFBGLBase.cc

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///
/// @file  FFBGLBase.hh
/// @brief Hammer base class for BGL form factors
///

//**** This file is a part of the HAMMER library
//**** Copyright (C) 2016 - 2020 The HAMMER Collaboration
//**** HAMMER is licensed under version 3 of the GPL; see COPYING for details
//**** Please note the MCnet academic guidelines; see GUIDELINES for details

// -*- C++ -*-
#include "Hammer/FormFactors/FFBGLBase.hh"
#include "Hammer/Particle.hh"

using namespace std;

namespace Hammer {

    FFBGLBase::FFBGLBase() {
        setGroup("BGL");
    }

    void FFBGLBase::eval(const Particle& parent, const ParticleList& daughters, const ParticleList&) {
        // Momenta
        const FourMomentum& pBmes = parent.momentum();
        const FourMomentum& pDstarmes = daughters[0].momentum();
        // const FourMomentum& pTau = daughters[2].momentum();


        // kinematic objects
        const double Mb = pBmes.mass();
        const double Mc = pDstarmes.mass();
        // const double Mt = pTau.mass();
        const double Sqq = pow(Mb, 2.) + pow(Mc, 2.) - 2. * (pBmes * pDstarmes);

        evalAtPSPoint({Sqq}, {Mb, Mc});
    }

    void FFBGLBase::addRefs() const {
        if(!getSettingsHandler()->checkReference("Boyd:1995sq")){
            string ref1 = 
                "@article{Boyd:1995sq,\n"
                "      author         = \"Boyd, C. Glenn and Grinstein, Benjamin and Lebed, Richard F.\",\n"
                "      title          = \"{Model independent determinations of anti-B ---> D (lepton), D* (lepton) anti-neutrino form-factors}\",\n"
                "      journal        = \"Nucl. Phys.\",\n"
                "      volume         = \"B461\",\n"
                "      year           = \"1996\",\n"
                "      pages          = \"493-511\",\n"
                "      doi            = \"10.1016/0550-3213(95)00653-2\",\n"
                "      eprint         = \"hep-ph/9508211\",\n"
                "      archivePrefix  = \"arXiv\",\n"
                "      primaryClass   = \"hep-ph\",\n"
                "      reportNumber   = \"UCSD-PTH-95-11\",\n"
                "      SLACcitation   = \"%%CITATION = HEP-PH/9508211;%%\"\n"
                "}\n";
            getSettingsHandler()->addReference("Boyd:1995sq", ref1);
        }
        if(!getSettingsHandler()->checkReference("Boyd:1997kz")){    
            string ref2 =
                "@article{Boyd:1997kz,\n"
                "      author         = \"Boyd, C. Glenn and Grinstein, Benjamin and Lebed, Richard F.\",\n"
                "      title          = \"{Precision corrections to dispersive bounds on form-factors}\",\n"
                "      journal        = \"Phys. Rev.\",\n"
                "      volume         = \"D56\",\n"
                "      year           = \"1997\",\n"
                "      pages          = \"6895-6911\",\n"
                "      doi            = \"10.1103/PhysRevD.56.6895\",\n"
                "      eprint         = \"hep-ph/9705252\",\n"
                "      archivePrefix  = \"arXiv\",\n"
                "      primaryClass   = \"hep-ph\",\n"
                "      reportNumber   = \"CMU-HEP-97-07A, UCSD-PTH-97-12\",\n"
                "      SLACcitation   = \"%%CITATION = HEP-PH/9705252;%%\"\n"
                "}\n";
            getSettingsHandler()->addReference("Boyd:1997kz", ref2);    
        }  
    }

}