The branching fraction is measured for the decay channels B{sup 0} {yields} {eta}{sub c}K{sub S}{sup 0} and B{sup +} {yields} {eta}{sub c}K{sup +} where {eta}{s

We study the decays B 2![eta]{sub c}K and B° 2![eta]{sub c}K°, where the [eta]{sub c} is reconstructed in the K{sub S}° K{sup ±} [pi]{sup {-+}} and K+K− [

We present a measurement of the branching fraction for the flavor-changing neutral current process B 2!X{sub s}ll− based on a sample of 88.9 x 106 [Upsilon](4