include/EvtGenModels/EvtBtoXsllUtil.hh

0001
0002 /***********************************************************************
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0020
0021 #ifndef EVTBTOXSLLUTIL_HH
0022 #define EVTBTOXSLLUTIL_HH
0023
0024 #include "EvtGenBase/EvtComplex.hh"
0025 #include "EvtGenBase/EvtDecayIncoherent.hh"
0026 #include "EvtGenBase/EvtParticle.hh"
0027
0028 class EvtComplex;
0029
0030 // Description:
0031 // Class to generate inclusive non-resonant B -> Xs l+ l- decays.
0032 // Description: Routine to generate non-resonant B -> Xs l+ l- decays.
0033 // It generates a dilepton mass spectrum according to
0034 // F.Kruger and L.M.Sehgal, Phys. Lett. B380, 199 (1996)
0035 // and then generates the two lepton momenta according to
0036 // A.Ali, G.Hiller, L.T.Handoko and T.Morozumi, Phys. Rev. D55, 4105 (1997).
0037 // Expressions for Wilson coefficients and power corrections are taken
0038 // from A.Ali, E.Lunghi, C.Greub and G.Hiller, Phys. Rev. D66, 034002 (2002).
0039 // Detailed formulae for shat dependence of these coefficients are taken
0040 // from H.H.Asatryan, H.M.Asatrian, C.Greub and M.Walker, PRD65, 074004 (2002)
0041 // and C.Bobeth, M.Misiak and J.Urban, Nucl. Phys. B574, 291 (2000).
0042 // The resultant Xs particles may be decayed by JETSET.
0043
0044 class EvtBtoXsllUtil {
0045   public:
0046     EvtComplex GetC7Eff0( double sh, bool nnlo = true );
0047     EvtComplex GetC7Eff1( double sh, double mb, bool nnlo = true );
0048     EvtComplex GetC9Eff0( double sh, double mb, bool nnlo = true,
0049                           bool btod = false );
0050     EvtComplex GetC9Eff1( double sh, double mb, bool nnlo = true,
0051                           bool btod = false );
0052     EvtComplex GetC10Eff( double sh, bool nnlo = true );
0053
0054     double dGdsProb( double mb, double ms, double ml, double s );
0055
0056     double dGdsdupProb( double mb, double ms, double ml, double s, double u );
0057
0058     double FermiMomentum( double pf );
0059
0060     double FermiMomentumProb( double pb, double pf );
0061 };
0062
0063 #endif