Quantum dissipative effects and neutrinos: Current constraints and future perspectives

We establish the most stringent experimental constraints coming from recent terrestrial neutrino experiments on quantum mechanical decoherence effects in neutrino systems. Taking a completely phenomenological approach, we probe vacuum oscillations plus quantum decoherence between two neutrino species in the channels ν_μ→ν_τ, ν_μ→νₑ, and νₑ→ν_τ, admitting that the quantum decoherence parameter {γ} is related to the neutrino energy E_ν as γ=γ₀E_νⁿ, with n=-1, 0, 1, and 2. Our bounds are valid for a neutrino mass squared difference compatible with the atmospheric, the solar and, in many cases, the LSND scales. We also qualitatively discuss the perspectives of the future long-baseline neutrino experiments to further probe quantum dissipation.