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 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.

We present a search for B decays to charmless final states involving charged or neutral a0 mesons. The data sample corresponds to 89 × 106 BB̄ pairs collected with the BABAR detector operating at the PEP-II asymmetric-energy B Factory at Stanford Linear Accelerator Center. We find no significant signals and determine the following 90% C.L. upper limits: B(B0 → a0-π+) < 5.1 × 10-6, B(B0 → a0-K+) < 2.1 × 10-6, B(B- → a0-K̄0) < 3.9 × 10-6, B(B+ → a00π+) < 5.8 × 10-6, B(B+ → a00K+) < 2.5 × 10-6, and B(B0 → a00K0) < 7.8 × 10-6, where in all cases B indicates the product of branching fractions for B → a0X and a0 ηπ, where X indicates K or π.

We describe a measurement of the direct CP asymmetry between inclusive b-->s gamma and b-->s gamma decays. This asymmetry is expected to be less than 0.01 in the standard model, but could be enhanced up to about 0.10 by new physics contributions. We use a sample of 89 x 10(6) BB pairs recorded with the BABAR detector at SLAC PEP-II, from which we reconstruct a set of 12 exclusive b-->s gamma final states containing one charged or neutral kaon and one to three pions. We measure an asymmetry of A(CP)(b-->s gamma)=0.025+/-0.050(stat)+/-0.015(syst), corresponding to an allowed range of -0.06s gamma)<+0.11 at 90% confidence level.

We have investigated the exclusive, radiative B meson decays to K 2*(1430) in 89 × 106 BB̄ events with the BABAR detector at the PEP-II storage ring. We measure the branching fractions B(B0 → K2*(1430)0γ) = (1.22 ± 0.25 ± 0.10) × 10-5 and B(B+ → K2*(1430)+γ) = (1.45 ± 0.40 ± 0.15) × 10-5, where the first error is statistical and the second systematic. In addition, we measure the CP-violating asymmetry A CP[B0 → K2*(1430) 0γ] = -0.08 ± 0.15 ± 0.01.

We report a measurement of the first four moments of the hadronic mass distribution in [Formula Presented] decays. The measurements are based on 89 million [Formula Presented] 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 minimum lepton momenta ranging from 0.9 to 1.6 GeV in the B rest frame. It is expected that such measurements will lead to improved determinations of [Formula Presented] and [Formula Presented] © 2004 The American Physical Society.