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      Measurement of the\(CP\)Asymmetry Amplitude\(\mathrm{sin}2\beta \)with\({B}^{0}\)Mesons

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      Physical Review Letters
      American Physical Society (APS)

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          Abstract

          We present results on time-dependent CP asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 88 x 10(6) Upsilon(4S)-->B(-)B 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 B(0) or B(-0) from its decay products. The amplitude of the CP 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)+/-0.034(syst) and |lambda|=0.948+/-0.051(stat)+/-0.030(syst). The magnitude of lambda is consistent with unity, in agreement with the standard model expectation of no direct CP violation in these modes.

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          CP-Violation in the Renormalizable Theory of Weak Interaction

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            Unitary Symmetry and Leptonic Decays

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              The BABAR detector

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                Author and article information

                Journal
                PRLTAO
                Physical Review Letters
                Phys. Rev. Lett.
                American Physical Society (APS)
                0031-9007
                1079-7114
                October 2002
                October 29 2002
                : 89
                : 20
                Article
                10.1103/PhysRevLett.89.201802
                12443469
                3a6dfd87-f383-4968-a20e-858e3c3e15bc
                © 2002

                http://link.aps.org/licenses/aps-default-license

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