Short baseline neutrino oscillations: when entanglement suppresses coherence

Understand

For neutrino oscillations to take place the entangled quantum state of a neutrino and a charged lepton produced via charged current interactions must be disentangled.

• Implementing a non-perturbative Wigner-Weisskopf method we obtain the correct \emph{entangled} quantum state of neutrinos and charged leptons from the (two-body) decay of a parent particle.
• The source lifetime and disentanglement length scale lead to a suppression of the oscillation probabilities in short-baseline experiments.
• The suppression is determined by $\pi\, L_s/L_{osc}$ where $L_s$ is the \emph{smallest} of the decay length of the parent particle or the disentanglement length scale.