Abstract
The decay law of a coherent mixture of K o L and K o S has been measured over nine K o S mean lives in the π +π - mode. The relative phase between the interfering amplitudes was found to be ϕη+- ϕif21 = (1.54 ±0.17) sign ( m L − m S) rad and the K o L − K o S mass difference fΔm/Γ S⋎ = 0.480 ± 0.024 .
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