Using events in which one of two neutral B mesons from the decay of an Υ (4S) resonance is fully reconstructed, we set limits on the lifetime difference between the two neutral-B mass eigenstates and on CP , T , and CPT violation in B0B0 mixing. Both CP and non-CP eigenstates were obtained from the 88 million Υ (4S) → BB decays collected between 1999 and 2002 with the BABAR detector at the PEP-...

We present preliminary measurements of direct and indirect CP -violating asymmetries in the decays of neutral B mesons to π+π−π0 and K±π∓π0 final states dominated by the ρ± resonance, using a time-dependent maximum likelihood analysis. The data sample comprises 88 × 106 Υ (4S) → BB decays (80.8 fb) collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. For the CP v...

We present a preliminary measurement of the branching fraction for B → ρeν and of the CKM matrix element |Vub| using approximately 55 million BB̄ meson pairs collected with the BABAR detector. Using isospin relations for several modes we find B(B → ρ e ν) = (3.39 ± 0.44 ± 0.52 ± 0.60) × 10 |Vub| = (3.69 ± 0.23 ± 0.27 +0.40 −0.59) × 10 . The quoted errors are statistical, systematic, and theoreti...

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 e+e− B Factory at SLAC. We study events containing a high-energy photon from one B (or B) decay and a tagging primary ...

We present measurements of the decays B0 → D (∗)+ s D∗−, using data recorded by the BABAR detector in 1999 and 2000, consisting of 20.8 fb. The analysis is conducted with a partial reconstruction technique, in which only the D (∗)+ s and the soft pion from the D∗− decay are reconstructed. From the observed rates, we measure the branching fractions B(B0 → D+ s D ∗−) = (1.03 ± 0.14 ± 0.13 ± 0.26)...

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...

We present preliminary results from a search for the flavor-changing neutral current decays B → K`+`− and B → K∗(892)`+`− using a sample of 22.7×106 Υ (4S) → BB̄ decays collected with the BABAR detector at the PEP-II B Factory. We have reconstructed the following final states: B+ → K+`+`−, B0 → K0`+`− (K0 s → π+π−), B+ → K∗+`+`− (K∗+ → K0 sπ), and B0 → K∗0`+`− (K∗0 → K+π−), where `+`− is either ...

A preliminary determination of the first moment of the hadronic mass distribution 〈M2 X −m 2 D〉 in semileptonic B decays has been obtained as a function of the minimum lepton momentum, ranging from 0.9 to 1.6 GeV/c. The measurement is based on a new technique involving BB events in which one fully reconstructed B meson decays hadronically and the recoiling B decays semileptonically. The mass of...

A preliminary determination of the first moment of the hadronic mass distribution 〈M2 X −m 2 D〉 in semileptonic B decays has been obtained as a function of the minimum lepton momentum, ranging from 0.9 to 1.6 GeV/c. The measurement is based on a new technique involving BB events in which one fully reconstructed B meson decays hadronically and the recoiling B decays semileptonically. The mass of...

Using data collected with the BABAR detector between 1999 and 2002, we report the observation of 823±57 B0 and 969±65 B+ decays to DD(∗)K, where D and D(∗) are fully reconstructed and where K is either a K or a K0 S decaying to π +π−. All 22 possible B decays to D (∗) D(∗)K are reconstructed exclusively and the corresponding branching fractions or limits are determined. The preliminary branchin...