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EvtBtoXsllUtil.hh
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EvtBtoXsllUtil.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 EVTBTOXSLLUTIL_HH
#define EVTBTOXSLLUTIL_HH
#include "EvtGenBase/EvtComplex.hh"
#include "EvtGenBase/EvtDecayIncoherent.hh"
#include "EvtGenBase/EvtParticle.hh"
class EvtComplex;
// Description:
// Class to generate inclusive non-resonant B -> Xs l+ l- decays.
// Description: Routine to generate non-resonant B -> Xs l+ l- decays.
// It generates a dilepton mass spectrum according to
// F.Kruger and L.M.Sehgal, Phys. Lett. B380, 199 (1996)
// and then generates the two lepton momenta according to
// A.Ali, G.Hiller, L.T.Handoko and T.Morozumi, Phys. Rev. D55, 4105 (1997).
// Expressions for Wilson coefficients and power corrections are taken
// from A.Ali, E.Lunghi, C.Greub and G.Hiller, Phys. Rev. D66, 034002 (2002).
// Detailed formulae for shat dependence of these coefficients are taken
// from H.H.Asatryan, H.M.Asatrian, C.Greub and M.Walker, PRD65, 074004 (2002)
// and C.Bobeth, M.Misiak and J.Urban, Nucl. Phys. B574, 291 (2000).
// The resultant Xs particles may be decayed by JETSET.
class EvtBtoXsllUtil {
public:
EvtComplex GetC7Eff0( double sh, bool nnlo = true );
EvtComplex GetC7Eff1( double sh, double mb, bool nnlo = true );
EvtComplex GetC9Eff0( double sh, double mb, bool nnlo = true,
bool btod = false );
EvtComplex GetC9Eff1( double sh, double mb, bool nnlo = true,
bool btod = false );
EvtComplex GetC10Eff( double sh, bool nnlo = true );
double dGdsProb( double mb, double ms, double ml, double s );
double dGdsdupProb( double mb, double ms, double ml, double s, double u );
double FermiMomentum( double pf );
double FermiMomentumProb( double pb, double pf );
};
#endif

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