R. Akers et al., THE PRODUCTION OF NEUTRAL KAONS IN Z(0) DECAYS AND THEIR BOSE-EINSTEIN CORRELATIONS, Zeitschrift fur Physik. C, Particles and fields, 67(3), 1995, pp. 389-401
The production of neutral kaons in e(+)e(-) annihilation at centre-of-
mass energies in the region of the Z(0) mass and their Bose-Einstein c
orrelations are investigated with the OPAL detector at LEP. A total of
about 1.26 x 10(6) Z(0) hadronic decay events are used in the analysi
s. The production rate of K-0 mesons is found to be 1.99 +/- 0.01 +/-
0.04 per hadronic event, where the first error is statistical and the
second systematic. Both the rate and the differential cross section fo
r K-0 production are compared to the predictions of Monte Carlo genera
tors. This comparison indicates that the fragmentation is too soft in
both JETSET and HERWIG. Bose-Einstein correlations in (KSKS0)-K-0 pair
s are measured through the quantity Q, the four momentum difference of
the pair. A threshold enhancement is observed in (KSKS0)-K-0 pairs or
iginating from a mixed sample of K-0 ($) over bar K-0 and (KK0)-K-0 ((
$) over bar K-0 ($) over bar K-0) pairs. For the strength of the effec
t and for the radius of the emitting source we find values of lambda =
1.14 +/- 0.23 +/- 0.32 and R(0) = (0.76 +/- 0.10 +/- 0.11) fm respect
ively. The first error is statistical and the second systematic.