R. Adler et al., MEASUREMENT OF THE K-L-K-S MASS DIFFERENCE USING SEMILEPTONIC DECAYS OF TAGGED NEUTRAL KAONS, Physics letters. Section B, 363(4), 1995, pp. 237-242
We present a new measurement of the K-L-K-S mass difference (Delta m)
using semileptonic decays of neutral kaons. The measurement yields Del
ta m = (0.5274 +/- 0.0029(stat.) +/- 0.0005(syst.)) x 10(10)(h) over b
ar/s.