No abstract

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 a study of the decay B0-->pi(0)pi(0) based on a sample of 124 x 10(6) BB pairs recorded by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We observe 46+/-13+/-3 events, where the first error is statistical and the second is systematic, corresponding to a significance of 4.2 standard deviations including systematic uncertainties. We measure the branching fraction B(B0-->pi(0)pi(0))=(2.1+/-0.6+/-0.3)x10(-6), averaged over B0 and B(0) decays.

The e + e − → pp cross-section is determined over a range of pp masses, from threshold to 4.5 GeV/c 2 , by studying the e + e − → ppγ process. The data set corresponds to an integrated luminosity of 232 fb −1 , collected with the BABAR detector at the PEP-II storage ring, at an e + e − center-of-mass energy of 10.6 GeV. The mass dependence of the ratio of electric and magnetic form factors, |GE /GM |, is measured for pp masses below 3 GeV/c 2 ; its value is found to be significantly larger than 1 for masses up to 2.2 GeV/c 2 . We also measure J/ψ → pp and ψ(2S) → pp branching fractions and set an upper limit on Y (4260) → pp production and decay.

We search for the production of doubly charmed baryons in e e ÿ annihilations at or near a center-ofmass energy of 10.58 GeV, in a data sample with an integrated luminosity of 232 fb ÿ1 recorded with the BABAR detector at the PEP-II storage ring at the Stanford Linear Accelerator Center. We search for cc baryons in the final states c K ÿ and 0 c , and cc baryons in the final states c K ÿ and 0 c. We find no evidence for the production of doubly charmed baryons.