R. Adler et al., MEASUREMENT OF THE CP VIOLATION PARAMETER ETA(-) USING TAGGED K-0 AND(K)OVER-BAR(0)(), Physics letters. Section B, 363(4), 1995, pp. 243-248
The CP violation parameter eta(+-) is determined through the eigentime
-dependent asymmetry in the rates of initially tagged K-0 and (K-0) ov
er bar decaying to pi(+)pi(-). The obtained values are \eta(+-)\ = (2.
312 +/- 0.043(stat.) +/- 0.030(syst.) +/- 0.011(tau S)) x 10(-3) and p
hi(+-) = 42.7 degrees +/- 0.9(stat.)degrees +/- 0.6(syst.)degrees +/-
0.9(Delta m)degrees with Delta m = (527.4 +/- 2.9) x 10(7) (h) over ba
r s(-1) measured in the same experiment using the semileptonic decay c
hannel.