8945520
Measurement of CP-Violating Asymmetries in the $B^0 \to K^{+} K^{-} K^0_{s}$ Dalitz Plot
We present a preliminary measurement of CP -violation parameters in the decay B0 → K+K−K0 S , using approximately 465 million BB events collected by the BABAR detector at SLAC. Reconstructing the neutral kaon as K0 S → π+π− or K0 S → π0π0, we analyze the Dalitz plot distribution and measure fractions to intermediate states. We extract CP parameters from the asymmetries in amplitudes and phases between B0 and B0 decays across the Dalitz plot. From a fit to the whole Dalitz plot, we measure βeff = 0.44 ± 0.07 ± 0.02, ACP = 0.03 ± 0.07 ± 0.02, where the first uncertainties are statistical and the second ones are systematic. For decays to φK0 S , we measure βeff = 0.13 ± 0.13 ± 0.02, ACP = 0.14 ± 0.19 ± 0.02. For decays to f0K S , we measure βeff = 0.15± 0.13± 0.03, ACP = 0.01± 0.26± 0.07. From a fit to the region of the Dalitz plot with mK+K− > 1.1GeV/c2, we measure βeff = 0.52 ± 0.08 ± 0.03, ACP = 0.05 ± 0.09 ± 0.04. Submitted to the 34th International Conference on High-Energy Physics, ICHEP 08, 29 July—5 August 2008, Philadelphia, Pennsylvania. Stanford Linear Accelerator Center, Stanford University, Stanford, CA 94309 Work supported in part by Department of Energy contract DE-AC02-76SF00515. The BABAR Collaboration, B. Aubert, M. Bona, Y. Karyotakis, J. P. Lees, V. Poireau, E. Prencipe, X. Prudent, V. Tisserand Laboratoire de Physique des Particules, IN2P3/CNRS et Université de Savoie, F-74941 Annecy-Le-Vieux, France J. Garra Tico, E. Grauges Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 Barcelona, Spain L. Lopez, A. Palano, M. Pappagallo INFN Sezione di Bari; Dipartmento di Fisica, Università di Bari, I-70126 Bari, Italy G. Eigen, B. Stugu, L. Sun University of Bergen, Institute of Physics, N-5007 Bergen, Norway G. S. Abrams, M. Battaglia, D. N. Brown, R. N. Cahn, R. G. Jacobsen, L. T. Kerth, Yu. G. Kolomensky, G. Lynch, I. L. Osipenkov, M. T. Ronan, K. Tackmann, T. Tanabe Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USA C. M. Hawkes, N. Soni, A. T. Watson University of Birmingham, Birmingham, B15 2TT, United Kingdom H. Koch, T. Schroeder Ruhr Universität Bochum, Institut für Experimentalphysik 1, D-44780 Bochum, Germany D. Walker University of Bristol, Bristol BS8 1TL, United Kingdom D. J. Asgeirsson, B. G. Fulsom, C. Hearty, T. S. Mattison, J. A. McKenna University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1 M. Barrett, A. Khan Brunel University, Uxbridge, Middlesex UB8 3PH, United Kingdom V. E. Blinov, A. D. Bukin, A. R. Buzykaev, V. P. Druzhinin, V. B. Golubev, A. P. Onuchin, S. I. Serednyakov, Yu. I. Skovpen, E. P. Solodov, K. Yu. Todyshev Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia M. Bondioli, S. Curry, I. Eschrich, D. Kirkby, A. J. Lankford, P. Lund, M. Mandelkern, E. C. Martin, D. P. Stoker University of California at Irvine, Irvine, California 92697, USA S. Abachi, C. Buchanan University of California at Los Angeles, Los Angeles, California 90024, USA J. W. Gary, F. Liu, O. Long, B. C. Shen, G. M. Vitug, Z. Yasin, L. Zhang University of California at Riverside, Riverside, California 92521, USA Deceased
125998058
Simultaneous Measurement of the $B^0$ Meson Lifetime and Mixing Frequency with $B^0 \rightarrow D^{*-}\ell^+\nu_\ell$ Decays
We measure the B0 lifetime tau_B0 and the B-Bbar oscillation frequency Deltam_d with a sample of approximately 14,000 exclusively reconstructed B0 -> D*- l+ nu_l signal events, selected from 23 million B-Bbar pairs recorded at the Upsilon(4S) resonance with the BABAR detector at the Stanford Linear Accelerator Center. The b-quark flavor of the other B at the time of decay and its decay position are determined inclusively. The lifetime and oscillation frequency are measured simultaneously with an unbinned maximum-likelihood fit that uses, for each event, the measured difference in B decay times (Delta-t), the calculated uncertainty on Delta-t, the signal and background probabilities, and b-quark tagging information for the other B. The preliminary results are tau_B0 = (1.523 +0.024 -0.023 (stat) +/- 0.022 (syst)) ps and Deltam_d = (0.492 +/- 0.018 (stat) +/- 0.013 (syst)) ps^-1. The statistical correlation coefficient between tau_B0 and Deltam_d is -0.22.
126014324
Measurement of Branching Fractions and CP and Isospin Asymmetries in $B \to K^{*} \gamma$
209868526
Measurements of the Semileptonic Decays anti-B ---> D l anti-nu and anti-B ---> D* l anti-nu Using a Global Fit to D X l anti-nu Final States
117345067
Measurements of the branching fraction and CP-violating asymmetries of $B^0 \to K^0_{S} \pi^0$ decays
121974514
A measurement of CP-violation parameters in B0 anti-B0 mixing using partially reconstructed D*- l+ nu/l events at BaBar
CP violation in B0B0bar mixing is characterized by the value of the parameter |q/p| being different from 1, and the Standard Model predicts this difference to be smaller than 10^{-3}. We present a measurement of this parameter using a partial reconstruction of one of the B mesons in the semileptonic channel D*- l+ nu_l, where only the hard lepton and the soft pion from the D*- --> D0bar pi- decay are reconstructed. The flavor of the other B is determined by means of lepton tagging. The determination of |q/p| is then performed with a fit to the proper time difference of the two B decays. We use a luminosity of 200.8 fb^-1, collected at the Y(4S) resonance by the BaBar detector at the PEP-II asymmetrical-energy e+e- collider, in the period 1999-2004. We obtain the preliminary result: |q/p| - 1 = (6.5 +/- 3.4(stat.) +/- 2.0(syst.)) x 10^{-3}
118452557
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