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A study of the potential of the BABAR detector at PEP II to measure CP violation using the vector-vector channel B[sup 0] [yields] D*[sup +]D*[sup -] is presented. The decay mode, although not a CP eigenstate, is sensitive to the angle [beta] of the unitarity triangle, a fundamental measure of CP violation in the neutral B system. The decay mode B[sup 0] [yields] D*[sup +]D*[sup -] is reconstructed in a variety of channels and a study of the separation of the CP eigenstate contributions and extraction of the angle [beta] is presented. The contribution of this channel is compared with other similar channels, and the overall prospects for measuring the angle [beta] in the first years of BABAR running is summarized.
A study of the potential of the BABAR detector at PEP II to measure CP violation using the vector-vector channel B{sup 0} {yields} D*{sup +}D*{sup -} is presented. The decay mode, although not a CP eigenstate, is sensitive to the angle {beta} of the unitarity triangle, a fundamental measure of CP violation in the neutral B system. The decay mode B{sup 0} {yields} D*{sup +}D*{sup -} is reconstructed in a variety of channels and a study of the separation of the CP eigenstate contributions and extraction of the angle {beta} is presented. The contribution of this channel is compared with other similar channels, and the overall prospects for measuring the angle {beta} in the first years of BABAR running is summarized.
The authors present measurements of the CP-violation parameters S and C for the radiative decays B° →?°K{sub S}°? and B° →?K{sub S}°?; for B →?K? they also measure the branching fractions and for B →?K+? the time-integrated charge asymmetry A{sub ch}. The data, collected with the BABAR detector at the SLAC National Accelerator Laboratory, represent 467 x 106 B{bar B} pairs produced in e+e− annihilation at the PEP-II collider. In this summary they present an updated measurement of the time-dependent CP asymmetry in B° →?°K{sub S}°? decay mode and the first measurement of the time-dependent CP asymmetry in B° →?K{sub S}°? decay mode. Hadronic corrections in B° →?°K{sub S}°? decay mode might permit S to be as large as ± 0.1. Such corrections and NP effects could depend on m(?°K{sub S}°), so they split the data into two parts: the K*(892) region with 0.8
The BABAR detector at the PEP-II asymmetric B Factory at SLAC collected a sample of 23 x 10[sup 6] B[bar B] pairs in the years 1999 and 2000. Using this data sample, we measure the amplitude of the time-dependent CP-violating asymmetry in neutral B decays to the CP eigenstates J/[psi] K[sub S][sup 0], [psi](2S) K[sub S][sup 0] and J/[psi] K[sub L][sup 0]. We find a value of sin2[beta]= 0.34[+-] 0.20(stat)[+-] 0.05(syst). We also present preliminary measurements of the B[sup 0][bar B][sup 0] oscillation frequency and of the lifetimes of charged and neutral B mesons.
We report the observation of CP violation in the B[sup 0] meson system. Using a novel technique for time-dependent measurements, we measure a non-zero value for the CP-violating amplitude sin2[beta] at the 4.1[sigma] level. We also report on precision measurements of the B[sup+] and B[sup 0] lifetimes and the B[sup 0][bar B][sup 0] mixing frequency[Delta]m[sub d] obtained with the same technique, and on a first measurement of the time-dependent CP-violating amplitude in B[sup 0][yields][pi][sup+][sup -] decays.
The BABAR experiment at SLAC provides an opportunity for measurement of CP violation in B decays. A measurement of time-dependent CP violating asymmetries using exclusive B meson decays where the b quark decays to c{bar c}d (including B° 2!D*D*− and B° 2!D*{sup ±}D{sup {-+}} decays) is presented here. This is the first measurement of CP violation in a mode sensitive to the Unitarity Triangle parameter sin2[beta] outside of decays containing charmonium. It provides a comparison to measurements of sin2[beta] using b 2!c{bar c}s, and permits an observation into potential new physics sources of CP violation, such as supersymmetry, via differences between these measurements and those of B° 2!J/[psi] K{sub S}° as statistics of reconstructed neutral B decays to D{sup (*)+} D{sup (*)-} increase. The measured value of the time-dependent CP violating asymmetries are: S = 0.38 ± 0.88(stat) ± 0.12(syst) and C = -0.30 ± 0.50(stat) ± 0.13(syst) for B° 2!D*− D; S = -0.43 ± 1.41(stat) ± 0.23(syst) and C = 0.53 ± 0.74(stat) ± 0.15(syst) for B° 2!D*+ D−; and S = -0.05 ± 0.45(stat) ± 0.05(syst) and C = 0.12 ± 0.30(stat) {+-} 0.05(syst) for B° 2!D*− D+; where S corresponds to CP violation in the interference of mixing and decay and C corresponds to CP violation in decay.
We present new measurements of CP asymmetries in B° → (c{bar c})K{sup 0(*)} decays recorded by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC between 1999 and 2004. We determine sin2[beta] from decay-time distributions of 7730 signal events in a data sample of approximately 227 x 106 [Upsilon](4S) → B{bar B} decays. The measured value of sin2[beta] = 0.722 ± 0.040(stat) ± 0.023(syst) is in agreement with the value expected from the Standard Model. In a separate time-dependent angular analysis of B → J/[psi] K*° (K*° → K{sub S}°[pi]°) decays we measure cos 2[beta] to be positive at 86% CL.
The BABAR detector, operating at energies near the[Upsilon](4S) resonance at the PEP-II asymmetric B Factory at SLAC, has collected a sample of 32 million B[bar B] pairs by May 2001. A study of time-dependent CP-violating asymmetries in events where one neutral B meson is fully reconstructed in a final state containing charmonium has resulted in the measurement sin2[beta]= 0.59[+-] 0.14 (stat)[+-] 0.05 (syst), which establishes CP violation in the B[sup 0] meson system at the 4[sigma] level. B lifetime and mixing measurements from a sub-sample of 23 million B[bar B] pairs are also presented.
During the first year of data taking, the 1999-2000 run, the BABAR detector at the SLAC PEP-II asymmetric collider has collected an integrated luminosity of 20.7 fb−1 corresponding to 22.7 million B{bar B} pairs at the [Upsilon](4S) resonance. Using this data, we present the measurement of sin2[beta] based on samples of B° → J/[psi] K{sub S}°, B° → [psi](2S) K{sub S}° and B° → J/[psi] K{sub L}° L decays. Our measured value is sin2[beta] = 0.34 ± 0.20 (stat) ± 0.05 (syst). In addition we report on the measurement of branching fractions for exclusive B decays to charmonium final states, measurements of charged and neutral B meson lifetimes and also the B°{bar B}° oscillation frequency.