This report describes the present status of the detector design for SuperB. It is one of four separate progress reports that, taken collectively, describe progress made on the SuperB Project since the publication of the SuperB Conceptual
We present updated results on time-dependent CP -violating asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 62 million Υ (4S) → BB decays collected between 1999 and 2001 by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. In this sample we study events in which one neutral B meson is fully reconstructed in a final state containing a charmonium meson and the flavor of the other neutral B meson is determined from its decay products. The amplitude of the CP -violating asymmetry, which in the Standard Model is proportional to sin2β, is derived from the decay time distributions in such events. We measure sin2β = 0.75 ± 0.09 (stat) ± 0.04 (syst) and |λ| = 0.92 ± 0.06 (stat) ± 0.02 (syst). The latter is consistent with the Standard Model expectation of no direct CP violation. These results are preliminary.
We present the result of a search for the charmless two-body baryonic decay B 0 →pp ¯in a sample of 88 million ⌼(4S)→BB ¯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(B 0 →pp ¯)Ͻ2.7ϫ10 Ϫ7 .
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