S. Anderson et al., Improved upper limits on the flavor-changing neutral current decays B -> Kl(+)l(-) and B -> K*(892)l(+)l(-) - art. no. 181803, PHYS REV L, 8718(18), 2001, pp. 1803
We have searched a sample of 9.6 x 10(6) B(B) over bar events for the flavo
r-changing neutral current decays B --> Kl(+)l(-) and B --> K*(892)l(+)l(-)
. We subject the latter decay to the requirement that the dilepton mass m(l
l) exceed 0.5 GeV. There is no indication of a signal. We obtain the 90% co
nfidence level upper limits B (B --> Kl(+)l(-)) < 1.7 x 10(-6) and B(B <rig
ht arrow> K*(892)l(+)l(-))m(ll>0.5GeV) < 3.3 x 10(-6). We also obtain an up
per limit on the weighted average 0.65B(B <right arrow> Kl(+)l(-)) + 0.35B(
B --> K*(892)l(+)l(-))m(ll>0.5GeV) < 1.5 x 10(-6). The weighted-average lim
it is only 50% above the standard model prediction.