2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/178724The most sensitive experiment to date to search for the muon and electron lepton number violating decay $K^0_L \to μ^\pm e^\mp$ has detected no events consistent with this process. Based on this result, the 90% confidence level upper limit on the branching fraction is $B(K^0_L \to μ^\pm e^\mp) < 4.7\times10^{-12}$.6 pages, 4 figuresHigh Energy Physics - Experimenttext