Measurement of the time-dependent CP asymmetry in the B-0 ->phi K-0 decay

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doi:10.1103/PhysRevLett.93.071801

We present a measurement of the time-dependent CP asymmetry for the neutral B-meson decay B-0-->phiK(0). We use a sample of approximately 114x10(6) B-meson pairs taken at the Y(4S) resonance with the BABAR detector at the PEP-II B-meson factory at SLAC. We reconstruct the CP eigenstates phiK(S)(0) and phiK(L)(0), where phi-->K+K-, K-S(0)-->pi(+)pi(-), and K-L(0) is observed via its hadronic interactions. The other B meson in the event is tagged as either a B-0 or (B) over bar (0) from its decay products. The values of the CP-violation parameters are S-phiK=0.47+/-0.34(stat)(-0.06)(+0.08)(syst) and C-phiK=0.01+/-0.33(stat)+/-0.10(syst). RI de Groot, Nicolo/A-2675-2009; Patrignani, Claudia/C-5223-2009; Lista, Luca/C-5719-2008; Bellini, Fabio/D-1055-2009; crosetti, nanni/H-3040-2011; Neri, Nicola/G-3991-2012; Sarti, Alessio/I-2833-2012; Monge, Maria Roberta/G-9127-2012