- CONF - 04 / 30 SLAC - PUB - 10617 Measurements of the Branching Fraction and CP - Violating Asymmetries of B 0 → K 0 S π 0 Decays
نویسندگان
چکیده
We present measurements of the branching fraction and time-dependent CP -violating (CPV) asymmetries in B0 → K0 S π0 decays based on 227 million Υ (4S) → BB decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. We obtain a branching fraction B(B0 → K0π0) = (11.4 ± 0.9 ± 0.6) · 10−6, the magnitude of the direct CPV asymmetry CK0 S π0 = 0.06 ± 0.18 ± 0.06 and the magnitude of the CPV asymmetry in the interference between mixing and decay SK0 S π0 = 0.35 +0.30 −0.33 ± 0.04, where the first error is statistical and the second systematic. All results are preliminary. Submitted to the 32 International Conference on High-Energy Physics, ICHEP 04, 16 August—22 August 2004, Beijing, China Stanford Linear Accelerator Center, Stanford University, Stanford, CA 94309 Work supported in part by Department of Energy contract DE-AC03-76SF00515. The BABAR Collaboration, B. Aubert, R. Barate, D. Boutigny, F. Couderc, J.-M. Gaillard, A. Hicheur, Y. Karyotakis, J. P. Lees, V. Tisserand, A. Zghiche Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France A. Palano, A. Pompili Università di Bari, Dipartimento di Fisica and INFN, I-70126 Bari, Italy J. C. Chen, N. D. Qi, G. Rong, P. Wang, Y. S. Zhu Institute of High Energy Physics, Beijing 100039, China G. Eigen, I. Ofte, B. Stugu University of Bergen, Inst. of Physics, N-5007 Bergen, Norway G. S. Abrams, A. W. Borgland, A. B. Breon, D. N. Brown, J. Button-Shafer, R. N. Cahn, E. Charles, C. T. Day, M. S. Gill, A. V. Gritsan, Y. Groysman, R. G. Jacobsen, R. W. Kadel, J. Kadyk, L. T. Kerth, Yu. G. Kolomensky, G. Kukartsev, G. Lynch, L. M. Mir, P. J. Oddone, T. J. Orimoto, M. Pripstein, N. A. Roe, M. T. Ronan, V. G. Shelkov, W. A. Wenzel Lawrence Berkeley National Laboratory and University of California, Berkeley, CA 94720, USA M. Barrett, K. E. Ford, T. J. Harrison, A. J. Hart, C. M. Hawkes, S. E. Morgan, A. T. Watson University of Birmingham, Birmingham, B15 2TT, United Kingdom M. Fritsch, K. Goetzen, T. Held, H. Koch, B. Lewandowski, M. Pelizaeus, M. Steinke Ruhr Universität Bochum, Institut für Experimentalphysik 1, D-44780 Bochum, Germany J. T. Boyd, N. Chevalier, W. N. Cottingham, M. P. Kelly, T. E. Latham, F. F. Wilson University of Bristol, Bristol BS8 1TL, United Kingdom T. Cuhadar-Donszelmann, C. Hearty, N. S. Knecht, T. S. Mattison, J. A. McKenna, D. Thiessen University of British Columbia, Vancouver, BC, Canada V6T 1Z1 A. Khan, P. Kyberd, L. Teodorescu Brunel University, Uxbridge, Middlesex UB8 3PH, United Kingdom A. E. Blinov, V. E. Blinov, V. P. Druzhinin, V. B. Golubev, V. N. Ivanchenko, E. A. Kravchenko, A. P. Onuchin, S. I. Serednyakov, Yu. I. Skovpen, E. P. Solodov, A. N. Yushkov Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia D. Best, M. Bruinsma, M. Chao, I. Eschrich, D. Kirkby, A. J. Lankford, M. Mandelkern, R. K. Mommsen, W. Roethel, D. P. Stoker University of California at Irvine, Irvine, CA 92697, USA C. Buchanan, B. L. Hartfiel University of California at Los Angeles, Los Angeles, CA 90024, USA
منابع مشابه
Ckm03 Sin(2β): Status and Prospects
An overview of the observation of CP violation in the neutral B system, and the measurements of the CP-violating asymmetry sin2β with B → charmonium K 0 S ,L events, performed by the BABAR and Belle experiments at the SLAC and KEK B factories is given. In addition, the measurements of sin2β with several other modes are described, including B → φK 0 S , which, as the leading contribution is from...
متن کاملCP-violation in b → s Penguin Decays at BaBar
We present the new and updated BABAR measurements of CP -violation studies for many b → s penguin decay modes. We report the first observation of mixing-induced CP -violation in B → η ′ K with a significance (including systematic uncertainties) of 5.5σ. We also present the first observation of the decay B → ρK. Using the time-dependent Dalitz plot analysis of B → KKK decay, the CP -parameters A...
متن کاملMeasurements of branching fractions and CP - violating asymmetries in B 0 → π + π − , K + π − , K + K − decays
Recent measurements of the CP -violating asymmetry parameter sin2β by the BABAR [1] and BELLE [2] collaborations established CP violation in the B system. These measurements, as well as updated preliminary results [3, 4], are consistent with the Standard Model expectation based on measurements and theoretical estimates of the elements of the Cabibbo-Kobayashi-Maskawa [5] (CKM) quark-mixing matr...
متن کاملMeasurements of charmless B decays related to α at BABAR Vincenzo LOMBARDO
We report recent measurements of the CKM angle α using data collected by the BABAR detector at the PEP-II asymmetric-energy e + e − collider at the SLAC National Accelerator Laboratory. In addition to improved constraints on α from the decays B ± → ρ ± ρ 0 , we also present preliminary results of neutral and charged B meson decays to K 1 (1270)π and K 1 (1400)π and its impact on the estimate fo...
متن کاملCharm decays at B A B AR M . Charles University of Iowa SLAC M / S 35 , 2575 Sand Hill Road , Menlo Park , CA 94025 ( representing the
The results of several studies of charmed mesons and baryons at BABAR are presented. First, searches for the rare decays D 0 → l + l − are presented and new upper limits on these processes are established. Second, a measurement of the branching fraction of the isospin-violating hadronic decay D * s (2112) + → D + s π 0 relative to the radiative decay D * s (2112) + → D + s γ is made. Third, the...
متن کامل