نتایج جستجو برای: robbe
تعداد نتایج: 113 فیلتر نتایج به سال:
We present a preliminary determination of the inclusive branching fraction for the rare radiative penguin transition B → Xsγ. The measurement is based on a data sample of 60 million BB pairs collected between 1999 and 2001 with the BABAR detector at the PEP-II asymmetric-energy ee B Factory at SLAC. We study events containing a high-energy photon from one B (or B) decay and a tagging primary le...
We have searched for direct CP violation in quasi-two-body charmless B decays observed in a sample of about 45 million B mesons collected with the BABAR detector at the PEP-II collider. We measure the following charge asymmetries in decay: ACP (B → ηK) = −0.11± 0.11± 0.02, ACP (B → ωπ) = −0.01 −0.31 ± 0.03, ACP (B → φK) = −0.05 ± 0.20 ± 0.03, ACP (B → φK) = −0.43 −0.30 ± 0.06, and ACP (B0/B̄0 → ...
We report a preliminary measurement of the first and second moments of the hadronic mass distributions in B → Xc ν decays. The measurements are based on Υ (4S) → BB events where the hadronic decay of one of the B mesons is fully reconstructed and a charged lepton from the decay of the other B meson is identified. The moments are presented for threshold lepton momenta ranging from 0.9 to 1.6 GeV...
We present preliminary results of the analyses of B → hπ and B → hK decays (with h = π,K) from a sample of approximately 60 million BB pairs collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We find evidence for a signal in B → ππ, and we measure the branching fraction B(B → ππ) = (4.1 −1.0 ± 0.8)× 10. We also measure the following branching ratios and charge as...
In this report, we present the observation of the exclusive decays B → ηcK and B → ηcK, and the measurement of the related branching fractions. Using a sample of 22.7×10 Υ (4S) → BB decays collected with the BABAR detector at the SLAC PEP-II asymmetric B Factory during 19992000, we have observed statistically significant signals in the ηc → K SKπ and KKπ channels and set upper limits in the ηc ...
A preliminary measurement of |Vcb| and the branching fraction B(B̄0 → Dlν̄l) has been performed based on a sample of about 55,700 B̄0 → Dlν̄l decays recorded with the BABAR detector. The decays are identified in the D∗+ → D0π+ final state, with the D0 reconstructed in three different decay modes. The differential decay rate is measured as a function of the relativistic boost of the D∗+ in the B̄0 re...
The inclusive production of charmonium mesons in B meson decay has been studied in a 20.3 fb−1 data set collected by the BABAR experiment operating at the Υ (4S) resonance. Branching fractions have been measured for the inclusive production of the charmonium mesons J/ψ , ψ(2S), χc1, and χc2. The branching fractions are also presented as a function of the center-of-mass momentum of the mesons an...
We present preliminary results of the analyses of B+ → h+π0 (with h+ = π+,K+) and B0 → K0π0 decays from a sample of approximately 88 million BB pairs collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We measure the π+π0 branching fraction and we obtain B(B → ππ) = (5.5 −0.9 ± 0.6) × 10 with a significance of 7.7σ including systematic uncertainties. We measure th...
A preliminary result on the study of the inclusive electron spectrum in B → Xueν decays above the kinematic limit for the dominant B → Xceν transitions is presented. This study is performed at the PEP-II asymmetric B Factory, where B meson pairs are produced in the decay of the Υ (4S) resonance. For the electron momentum range of 2.3 − 2.6 GeV/c in the Υ (4S) rest frame, the partial branching r...
We present preliminary results of the analysis of B → Dh decays, with h = π,K and the D reconstructed in the channelsKπ, Kπππ, Kππ and in the CP eigenstate KK, using data collected by the BABAR detector during the years 2000-2002 at the PEP-II asymmetric-energy B Factory at SLAC. We have measured the ratio of the branching fractions R ≡ B(B − → DK) B(B− → Dπ) = (8.31 ± 0.35 ± 0.20)% and the dir...
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