We describe searches for B meson decays to the charmless vector-vector final states ωK* and ωρ in 89 × 106 BB̄ pairs produced in e+e- annihilation at √s = 10.58 GeV. We measure the following branching fractions in units of 10 -6: B(B0 → ωK*0) = 3.4 -1.6+1.8 ± 0.4(<6.0), B(B+ → ωK*+) = 3.5-2.0+2.5 ± 0.7(<7.4), B(B0 → ωρ0) = 0.6 -1.1+1.3 ± 0.4(<3.3), and B(B+ → ωρ+) = 12.6-3.3+3.7 ± 1.6. The first error quoted is statistical, the second systematic, and the upper limits are defined at 90% confidence level. For B+ → ωρ+ we also measure the longitudinal spin alignment fraction fL = 0.88-0.15+0.12 ± 0.03 and charge asymmetry Ach = (5 ± 26 ± 2)%. © 2005 The American Physical Society.

We search for B0 meson decays into two-body combinations of K0, η, η′, and mesons in 324×106 BB̄ pairs collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC. We measure the following branching fractions (upper limits at 90% confidence level) in units of 10-6: B(B0→ηK0)=1.8-0.6+0.7±0.1(<2.9), B(B0→ηη)=1.1-0.4+0.5±0.1(<1.8), B(B0→η)=0. 1±0.2±0.1(<0.6), B(B0→η′)=0.2-0.3+0.4±0. 1(<1.0), and B(B0→η′η′)=1.0-0.6+0.8±0. 1(<2.4), where the first error is statistical and the second systematic. © 2006 The American Physical Society.

We present a measurement of the time-dependent CP-violating (CPV) asymmetries in B0-->K(0)(S)pi(0) decays based on 124x10(6) Upsilon(4S)-->BB decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. In a sample containing 122+/-16 signal decays, we obtain the magnitudes of the direct CPV asymmetry CK(0)(S)(pi(0))=0.40(+0.27)(-0.28)+/-0.09 and of the CPV asymmetry in the interference between mixing and decay SK(0)(S)(pi(0))=0.48(+0.38)(-0.47)+/-0.06 where the first error is statistical and the second systematic.

We report the results of a search for T, CP, CPT, and violation in B0-B0 mixing using an inclusive dilepton sample collected by the BABAR experiment at the PEP-II factory. Using a sample of 232 x 10(6) BB pairs, we measure the T and CP violation parameter |q/p| - 1 = (-0.8 +/- 2.7(stat) +/- 1.9(syst) x 10(-3), and the CPT and CP parameters Imz = (13.9 +/- 7.3(stat) +/- 3.2(syst)) x 10(-3) and Delta Gamma x Rez = (7.1 +/- 3.9(stat) +/- 2.0(stat)) x 10(-3) ps(-1). The statistical correlation between the measurements of Imz and Delta Gamma x Rez is 76%.

We present the result of a search for the charmless two-body baryonic decay B0→ppmacr; in a sample of 88 million Y(4S)→BB̄ decays collected by the BABAR detector at the SLAC PEP-II asymmetric-energy B Factory. We use Cherenkov radiation to identify protons cleanly, and determine the signal yield with a maximum-likelihood fit technique using kinematic and topological information. We find no evidence for a signal and place a 90% confidence-level upper limit of B(B0→ pp̄)<2.7× 10-7. © 2004 The American Physical Society.

A search for charmed baryons decaying to D(0)p reveals two states: the Lambdac(2880)+ baryon and a previously unobserved state at a mass of [2939.8+/-1.3(stat)+/-1.0(syst)] MeV/c2 and with an intrinsic width of [17.5+/-5.2(stat)+/-5.9(syst)] MeV. Consistent and significant signals are observed for the K(-)pi(+) and K(-)pi(+)pi(-)pi(+) decay modes of the D0 in 287 fb(-1) annihilation data recorded by the BABAR detector at a center-of-mass energy of 10.58 GeV. There is no evidence in the D+p spectrum of doubly charged partners. The mass and intrinsic width of the Lambdac(2880)+ baryon and relative yield of the two baryons are also measured.