We present evidence for D0-anti-D0 mixing in D0 --> K+pi- decays from 384 fb^{-1} of e+e- colliding-beam data recorded near sqrt(s) 10.6 GeV with the BaBar detector at the PEP-II storage rings at SLAC. We find the mixing parameters x'^2 = [-0.22 +- 0.30 (stat.) +- 0.21 (syst.)] x 10^{-3} and y' = [9.7 +- 4.4 (stat.) +- 3.1 (syst.)] x 10^{-3}, and a correlation between them of -0.94. This result is inconsistent with the no-mixing hypothesis with a significance of 3.9 standard deviations. We measure R_D, the ratio of doubly Cabibbo-suppressed to Cabibbo-favored decay rates, to be [0.303 +- 0.016 (stat.) +- 0.010 (syst.)]%. We find no evidence for \CP violation.

Evidence for D0-anti-D0 Mixing / B. Aubert, M. Bona, D. Boutigny, Y. Karyotakis, J. P. Lees, V. Poireau, X. Prudent, V. Tisserand, A. Zghiche, J. Garra Tico, E. Grauges, L. Lopez, A. Palano, G. Eigen, B. Stugu, L. Sun, G.S. Abrams, M. Battaglia, D.N. Brown, J. Button-Shafer, R.N. Cahn, Y. Groysman, R.G. Jacobsen, J.A. Kadyk, L.T. Kerth, Yu. G. Kolomensky, G. Kukartsev, D. Lopes Pegna, G. Lynch, L.M. Mir, T.J. Orimoto, M.T. Ronan,, K. Tackmann, W.A. Wenzel, P. del Amo Sanchez, C.M. Hawkes, A.T. Watson, T. Held, H. Koch, B. Lewandowski, M. Pelizaeus, T. Schroeder, M. Steinke, D. Walker, D.J. Asgeirsson, T. Cuhadar-Donszelmann, B.G. Fulsom, C. Hearty, N.S. Knecht, T.S. Mattison, J.A. McKenna, A. Khan, M. Saleem, L. Teodorescu, V.E. Blinov, A.D. Bukin, V.P. Druzhinin, V.B. Golubev, A.P. Onuchin, S.I. Serednyakov, Y.I. Skovpen, E.P. Solodov, K.Y. Todyshev, M. Bondioli, S. Curry, I. Eschrich, D. Kirkby, A.J. Lankford, P. Lund, M. Mandelkern, E.C. Martin, D.P. Stoker, S. Abachi, C. 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Evidence for D0-anti-D0 Mixing

E. Latour;S.H. Robertson;A. Lazzaro;M. Morganti;
2007

Abstract

We present evidence for D0-anti-D0 mixing in D0 --> K+pi- decays from 384 fb^{-1} of e+e- colliding-beam data recorded near sqrt(s) 10.6 GeV with the BaBar detector at the PEP-II storage rings at SLAC. We find the mixing parameters x'^2 = [-0.22 +- 0.30 (stat.) +- 0.21 (syst.)] x 10^{-3} and y' = [9.7 +- 4.4 (stat.) +- 3.1 (syst.)] x 10^{-3}, and a correlation between them of -0.94. This result is inconsistent with the no-mixing hypothesis with a significance of 3.9 standard deviations. We measure R_D, the ratio of doubly Cabibbo-suppressed to Cabibbo-favored decay rates, to be [0.303 +- 0.016 (stat.) +- 0.010 (syst.)]%. We find no evidence for \CP violation.
D Mixing ; Matrice CKM ; mixing dei mesoni D
Settore FIS/01 - Fisica Sperimentale
Settore FIS/04 - Fisica Nucleare e Subnucleare
2007
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/39194
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