Module flavio.physics.mudecays.mu3e

Functions for the lepton flavour violating $\mu\to 3e$ decay.

Functions

def BR_mu3e(wc_obj, par)

Expand source code

def BR_mu3e(wc_obj, par):
    r"""Branching ratio of $\mu^-\to e^-e^+e^-$."""
    scale = flavio.config['renormalization scale']['mudecays']
    wceff = wc_eff(wc_obj, par, scale, 'mu', 'e', 'e', 'e', nf_out=4)
    # cf. (22, 23) of hep-ph/0404211
    pre_br = 1 / (8 * par['GF']**2)
    br_wc = _BR_tau3mu(par['m_mu'], par['m_e'], wceff)
    return pre_br * br_wc

Branching ratio of $\mu^-\to e^-e^+e^-$.