61 research outputs found

    Measurement of the CP-Violating Asymmetry Amplitude sin2β\beta

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    We present results on time-dependent CP-violating asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 88 million Y(4S) --> B Bbar decays collected between 1999 and 2002 with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We study events in which one neutral B meson is fully reconstructed in a final state containing a charmonium meson and the other B meson is determined to be either a B0 or B0bar from its decay products. The amplitude of the CP-violating asymmetry, which in the Standard Model is proportional to sin2beta, is derived from the decay-time distributions in such events. We measure sin2beta = 0.741 +/- 0.067 (stat) +/- 0.033 (syst) and |lambda| = 0.948 +/- 0.051 (stat) +/- 0.017 (syst). The magnitude of lambda is consistent with unity, in agreement with the Standard Model expectation of no direct CP violation in these modes

    Measurement of the electron energy spectrum and its moments in inclusive B -> Xe nu decays

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    We report a measurement of the inclusive electron energy spectrum for semileptonic decays of B mesons in a data sample of 52 million Y(4S)-->B(B) over bar decays collected with the BABAR detector at the PEP-II asymmetric-energy B-meson factory at SLAC. We determine the branching fraction, first, second, and third moments of the spectrum for lower cutoffs on the electron energy between 0.6 and 1.5 GeV. We measure the partial branching fraction to be B(B-->Xenu,E-e>0.6 GeV)=[10.36+/-0.06(stat.)+/-0.23(sys.)]%

    The Physics of the B Factories

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    Borderline surgery of invasive kidney tumours

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    Treatment of hypernephroma presenting with atria-caval involvement without distant metastases is a surgical challenge. The procedures used in three different cases are described. In one case the caval thrombus extending into the atria-caval junction was delivered during clamping of the atrium without cardiovascular bypass. In another case the remaining atrial thrombus was removed in a second session with cardiovascular bypass. For the third case cardiac bypass was established immediately to permit safe and complete removal of the atria-caval thrombus. In order to plan the surgical procedure adequately, it appears essential to determine exactly the upper level of the thrombus. In cases with atrial involvement, cardiovascular bypass is advisable to perform radical surgery under the safest conditions. © 1984 Springer-Verlag.SCOPUS: ar.jinfo:eu-repo/semantics/publishe
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