Direct CP, lepton flavor, and isospin asymmetries in the decays B-->K()l+l

• Published in: Physical review letters Vol. 102; no. 9; p. 091803
• Main Authors: Aubert, B, Bona, M, Karyotakis, Y, Lees, J P, Poireau, V, Prencipe, E, Prudent, X, Tisserand, V, Garra Tico, J, Grauges, E, Lopez, L, Palano, A, Pappagallo, M, Eigen, G, Stugu, B, Sun, L, Abrams, G S, Battaglia, M, Brown, D N, Cahn, R N, Jacobsen, R G, Kerth, L T, Kolomensky, Yu G, Lynch, G, Osipenkov, I L, Ronan, M T, Tackmann, K, Tanabe, T, Hawkes, C M, Soni, N, Watson, A T, Koch, H, Schroeder, T, Walker, D, Asgeirsson, D J, Fulsom, B G, Hearty, C, Mattison, T S, McKenna, J A, Barrett, M, Khan, A, Blinov, V E, Bukin, A D, Buzykaev, A R, Druzhinin, V P, Golubev, V B, Onuchin, A P, Serednyakov, S I, Skovpen, Yu I, Solodov, E P, Todyshev, K Yu, Bondioli, M, Curry, S, Eschrich, I, Kirkby, D, Lankford, A J, Lund, P, Mandelkern, M, Martin, E C, Stoker, D P, Abachi, S, Buchanan, C, Gary, J W, Liu, F, Long, O, Shen, B C, Vitug, G M, Yasin, Z, Zhang, L, Sharma, V, Campagnari, C, Hong, T M, Kovalskyi, D, Mazur, M A, Richman, J D, Beck, T W, Eisner, A M, Flacco, C J, Heusch, C A, Kroseberg, J, Lockman, W S, Schalk, T, Schumm, B A, Seiden, A, Wang, L, Wilson, M G, Winstrom, L O, Cheng, C H, Doll, D A, Echenard, B, Fang, F, Hitlin, D G, Narsky, I, Piatenko, T, Porter, F C, Andreassen, R, Mancinelli, G, Meadows, B T, Mishra, K, Sokoloff, M D
• Format: Journal Article
• Language: English
• Published: United States 06.03.2009
• ISSN: 0031-9007
• DOI: 10.1103/PhysRevLett.102.091803

We measure branching fractions and integrated rate asymmetries for the rare decays B-->K(*)l+l-, where l+l- is either e+e- or micro+micro-, using a sample of 384x10(6) BB events collected with the BABAR detector at the PEP-II e+e- collider. We find no evidence for direct CP or lepton-flavor asymmetries. However, for dilepton masses below the J/psi resonance, we find evidence for unexpectedly large isospin asymmetries in both B-->Kl+l- and B-->K*l+l- which differ, respectively, by 3.2sigma and 2.7sigma, including systematic uncertainties, from the standard model expectations.