Module flavio.physics.bdecays.bc_lifetime

$B_c$ lifetime

Functions

def tau_Bc(wc_obj, par)

Expand source code

def tau_Bc(wc_obj, par):
    r"""Lifetime of the $B_c$ meson based on the SM OPE estimate plus
    the NP contribution to leptonic decays."""
    Gamma_SM = 1 / par['tau_Bc_SM']
    Gamma_exp = 1 / par['tau_Bc']
    Gamma_NP = 0
    wc_sm = flavio.WilsonCoefficients()
    for l in ['e', 'mu', 'tau']:
        _br_SM = flavio.Observable['BR(Bc->{}nu)'.format(l)].prediction_par(par, wc_sm)
        _br_NP = flavio.Observable['BR(Bc->{}nu)'.format(l)].prediction_par(par, wc_obj)
        Gamma_NP += (_br_NP - _br_SM) * Gamma_exp
    return 1 / (Gamma_SM + Gamma_NP)

Lifetime of the $B_c$ meson based on the SM OPE estimate plus the NP contribution to leptonic decays.