$Measurement of the CP-Violating Asymmetry Amplitude sin2$\beta$

Measurement of the CP-Violating Asymmetry Amplitude sin2$\beta

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...

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Veröffentlicht in:	Physical review letters 2002, Vol.89, p.201802-1-7
Hauptverfasser:	Aubert, B., Boutigny, D., Gaillard, J.M., Hicheur, A., Karyotakis, Y., Lees, J.P., Robbe, P., Tisserand, V., Zghiche, A., Palano, A., Pompili, A., Chen, J.C., Qi, N.D., Rong, G., Wang, P., Zhu, Y.S., Eigen, G., Ofte, I., Stugu, B., Abrams, G.S., Borgland, A.W., Breon, A.B., Brown, D.N., Button-Shafer, J., Cahn, R.N., Charles, E., Gill, M.S., Gritsan, A.V., Groysman, Y., Jacobsen, R.G., Kadel, R.W., Kadyk, J., Kerth, L.T., Kolomensky, Yu.G., Kral, J.F., Leclerc, Céline, Levi, M.E., Lynch, G., Mir, L.M., Oddone, P.J., Orimoto, T.J., Pripstein, M., Roe, N.A., Romosan, A., Ronan, M.T., Shelkov, V.G., Telnov, A.V., Wenzel, W.A., Harrison, T.J., Hawkes, C.M., Knowles, D.J., O'Neale, S.W., Penny, R.C., Watson, A.T., Watson, N.K., Deppermann, T., Goetzen, K., Koch, H., Lewandowski, B., Peters, K., Schmuecker, H., Steinke, M., Barlow, N.R., Bhimji, W., Boyd, J.T., Chevalier, N., Clark, P.J., Cottingham, W.N., Mackay, C., Wilson, F.F., Abe, K., Hearty, C., Mattison, T.S., Mckenna, J.A., Thiessen, D., Jolly, S., Mckemey, A.K., Blinov, V.E., Bukin, A.D., Buzykaev, A.R., Golubev, V.B., Ivanchenko, V.N., Korol, A.A., Kravchenko, E.A., Onuchin, A.P., Serednyakov, S.I., Skovpen, Yu.I., Yushkov, A.N., Best, D., Chao, M., Kirkby, D., Lankford, A.J., Mandelkern, M., Mcmahon, S., Stoker, D.P., Buchanan, C., Chun, S., Hadavand, H.K., Hill, E.J., Macfarlane, D.B.
Format:	Artikel
Sprache:	eng
Schlagworte:	High Energy Physics - Experiment Physics
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Zusammenfassung:	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.
ISSN:	0031-9007 1079-7114