Evidence for CP violation in $B^0 \to J/\Psi \pi^0$ decays

Evidence for CP violation in $B^0 \to J/\Psi \pi^0$ decays

We present measurements of the branching fraction and time-dependent CP asymmetries in B0->J/Psi pi0 decays based on 466 million Y(4S)->BBbar events collected with the BaBar detector at the SLAC PEP-II asymmetric-energy B factory. We measure the CP asymmetry parameters S=-1.23 +/- 0.21 +/- 0.0...

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Veröffentlicht in:Physical review letters 2008, Vol.101
Hauptverfasser: Aubert, B., Bona, M., Karyotakis, Y., Lees, J.P., Poireau, V., Prencipe, E., Prudent, X., Tisserand, V., Garra Tico, J., Grauges, E., Lopez, L., Palano, A., Pappagallo, M., Eigen, G., Stugu, B., Sun, L., Abrams, G.S., Battaglia, M., Brown, D.N., Button-Shafer, J., Cahn, R.N., Jacobsen, R.G., Kadyk, J.A., Kerth, L.T., Kolomensky, Yu. G., Kukartsev, G., Lynch, G., Osipenkov, I.L., Ronan, M.T., Tackmann, K., Tanabe, T., Wenzel, W.A., Hawkes, C.M., Soni, N., Watson, A.T., Koch, H., Schroeder, T., Walker, D., Asgeirsson, D.J., Cuhadar-Donszelmann, T., Fulsom, B.G., Hearty, C., Mattison, T.S., Mckenna, J.A., Barrett, M., Khan, A., Saleem, M., Teodorescu, L., Blinov, V.E., Bukin, A.D., Buzykaev, A.R., Druzhinin, V.P., Golubev, V.B., Onuchin, A.P., Serednyakov, S. I., Skovpen, Yu. I., Solodov, E.P., Todyshev, K. Yu, Bondioli, M., Curry, S., Eschrich, I., Kirkby, D., Lankford, A.J., Lund, P., Mandelkern, M., Martin, E.C., Stoker, D.P., Abachi, S., Buchanan, C., Gary, J.W., Liu, F., Long, O., Shen, B.C., Vitug, G.M., Yasin, Z., Zhang, L., Sharma, V., Campagnari, C., Hong, T.M., Kovalskyi, D., Mazur, M.A., Richman, J.D., Beck, T.W., Eisner, A.M., Flacco, C.J., Heusch, C.A., Kroseberg, J., Lockman, W.S., Schalk, T., Schumm, B.A., Seiden, A., Wang, L., Wilson, M.G., Winstrom, L.O., Cheng, C.H., Doll, D.A., Echenard, B., Fang, F., Hitlin, D.G., Narsky, I.
Format: Artikel
Sprache:eng
Schlagworte:
High Energy Physics - Experiment
Physics
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Zusammenfassung:We present measurements of the branching fraction and time-dependent CP asymmetries in B0->J/Psi pi0 decays based on 466 million Y(4S)->BBbar events collected with the BaBar detector at the SLAC PEP-II asymmetric-energy B factory. We measure the CP asymmetry parameters S=-1.23 +/- 0.21 +/- 0.04 and C=-0.20 +/- 0.19 +/- 0.03, where the measured value of S is 4.0 standard deviations from zero including systematic uncertainties. The branching fraction is determined to be B(B0->J/Psi pi0)=(1.69 +/- 0.14 +/- 0.07)*10^{-5}.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.101.021801