Branching fraction measurements of B ->eta K-c decays

We study the decays B+-->eta(c)K(+) and B-0-->eta(c)K(0), where the eta(c) is reconstructed in the K(S)(0)K(+/-)pi(-/+) and K(+)K(-)pi(0) decay modes. Results are based on a sample of 86 million B (B) over bar pairs collected with the BABAR detector at the SLAC e(+)e(-) B Factory. We measure the product of branching fractions B(B+-->eta(c)K(+))xB(eta(c)-->K (K) over bar pi)=(7.40+/-0.50+/-0.70)x10(-5) and B(B-0-->eta(c)K(0))xB(eta(c)-->K (K) over bar pi)=(6.48+/-0.85+/-0.71)x10(-5), where the first error is statistical and the second is systematic. In addition, we search for B-->eta(c)K events with eta(c)-->2(K+K-) and eta(c)-->phiphi and determine the eta(c) decay branching fraction ratios B(eta(c)-->2(K+K-))/B(eta(c)-->K (K) over bar pi)=(2.3+/-0.7+/-0.6)x10(-2) and B(eta(c)-->phiphi)/B(eta(c)-->K (K) over bar pi)=(5.5+/-1.4+/-0.5)x10(-2).