2004/08/16 by Aubert, B., Collaboration, BABAR
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)
paper · doi:10.48550/arxiv.hep-ex/0408069
Using a sample of 227 million Υ(4S) → B B events collected with the BABAR detector at the PEP-II B Factory in 1999--2004, we study B- → D0 K^*(892)- decays where K*- → K0S π- and D0 → K-π+, K- π+ π0, K-π+ π+ π- (non-CP final states), K+ K-, π+ π- (CP+ eigenstates), K0S~π0, K0S ϕ and K0S ω(CP- eigenstates). The partial rate charge asymmetries ACP and the ratios RCP defined in the literature as the sum of the B+ and B- partial rates to a charged K^* and a D0 CP-eigenstate divi ded by the B → D0 K^* decay rate, %of the \ensuremath\Bu\xspace\xspace m \ensuremath→\xspace \Dcp \ensuremathK^*\xspacepm branch ing fractions summed over %\B charge to the \ensuremathB-\xspace \xspace\ensuremath→\xspace \ensuremathD0\xspace \ensu remathK*-\xspace branching fraction are sensitive to the angle γ of the CKM unitarity triangle. We measure: ACP+ &=&-0.09 ± 0.20 (stat.) ± 0.06 (syst.) ACP- &=& -0.33 ± 0.34 (stat.) ± 0.10 (syst.) (+1.15 ± 0.12) ⋅ (ACP- - ACP+) RCP+ &=& +1.77 ± 0.37 (stat.) ± 0.12 (syst.) RCP- &=& +0.76 ± 0.29 (stat.) ± 0.06 (syst.) - 0.04- 0.14 The third uncertainty quoted for the CP- measurements reflects possible interference effects in the final states with ϕ and ω resonances. All results are preliminary.