Search for the rare decays B -> Kl(+)l(-) and B -> K*l(+)l(-) RID A-8798-2012 RID C-2728-2008 RID C-5223-2009 RID C-5719-2008 RID A-8865-2012 RID D-1189-2011 RID A-2675-2009

We present results from a search for the flavor-changing neutral current decays 𝐵 →𝐾⁢ℓ+⁢ℓ− and 𝐵 →𝐾*⁢ℓ+⁢ℓ− , where ℓ+⁢ℓ− is either an 𝑒+⁢𝑒− or 𝜇+⁢𝜇− pair. The data sample comprises 22.7 ×106 ⁢ϒ⁡(4⁢𝑆) →𝐵⁢ ¯ 𝐵 decays collected with the BABAR detector at the PEP-II B Factory. We obtain the 90% C.L. upper limits 𝐵⁡(𝐵 →𝐾⁢ℓ+⁢ℓ−) <0.51 ×10−6 and 𝐵⁡(𝐵 →𝐾*⁢ℓ+⁢ℓ−) <3.1 ×10−6 , close to standard model predictions for these branching fractions. We have also obtained limits on the lepton-family-violating decays 𝐵 →Ke±⁢𝜇∓ and 𝐵 →𝐾*⁢𝑒±⁢𝜇∓ .