Measurements of branching fractions and CP asymmetries and studies of angular distributions for BK decays
نویسندگان
چکیده
We present branching fraction and CP asymmetry measurements as well as angular studies of B→��K decays using 464×106 BB� events collected by the BABAR experiment. The branching fractions are measured in the �� invariant mass range below the �c resonance (m��<2.85 GeV). We find B(B+→��K+)=(5.6±0.5±0.3)×10-6 and B(B0→��K0)=(4.5±0.8±0.3)×10-6, where the first uncertainty is statistical and the second systematic. The measured direct CP asymmetries for the B± decays are ACP=-0.10±0.08±0.02 below the �c threshold (m��<2.85 GeV) and ACP=0.09±0.10±0.02 in the �c resonance region (m�� in [2.94, 3.02] GeV). Angular distributions are consistent with JP=0in the �c resonance region and favor JP=0+ below the �c resonance. DOI: https://doi.org/10.1103/PhysRevD.84.012001 Posted at the Zurich Open Repository and Archive, University of Zurich ZORA URL: https://doi.org/10.5167/uzh-58672 Accepted Version Originally published at: BABAR Collaboration; Snoek, H; Lees, J P (2011). Measurements of branching fractions and CP asymmetries and studies of angular distributions for B→��K decays. Physical Review D, 84(1):012001. DOI: https://doi.org/10.1103/PhysRevD.84.012001 ar X iv :1 10 5. 51 59 v1 [ he pex ] 2 5 M ay 2 01 1 BABAR-PUB-11/003; SLAC-PUB-14473 Measurements of branching fractions and CP asymmetries and studies of angular distributions for B → φφK decays J. P. Lees, V. Poireau, E. Prencipe, and V. Tisserand Laboratoire d’Annecy-le-Vieux de Physique des Particules (LAPP), Université de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux, France J. Garra Tico and E. Grauges Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 Barcelona, Spain M. Martinelli, D. A. Milanes, A. Palano, and M. Pappagallo INFN Sezione di Bari; Dipartimento di Fisica, Università di Bari, I-70126 Bari, Italy G. Eigen, B. Stugu, and L. Sun University of Bergen, Institute of Physics, N-5007 Bergen, Norway D. N. Brown, L. T. Kerth, Yu. G. Kolomensky, and G. Lynch Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USA H. Koch and T. Schroeder Ruhr Universität Bochum, Institut für Experimentalphysik 1, D-44780 Bochum, Germany D. J. Asgeirsson, C. Hearty, T. S. Mattison, and J. A. McKenna University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1 A. Khan Brunel University, Uxbridge, Middlesex UB8 3PH, United Kingdom V. E. Blinov, A. R. Buzykaev, V. P. Druzhinin, V. B. Golubev, E. A. Kravchenko, A. P. Onuchin, S. I. Serednyakov, Yu. I. Skovpen, E. P. Solodov, K. Yu. Todyshev, and A. N. Yushkov Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia M. Bondioli, S. Curry, D. Kirkby, A. J. Lankford, M. Mandelkern, and D. P. Stoker University of California at Irvine, Irvine, California 92697, USA H. Atmacan, J. W. Gary, F. Liu, O. Long, and G. M. Vitug University of California at Riverside, Riverside, California 92521, USA C. Campagnari, T. M. Hong, D. Kovalskyi, J. D. Richman, and C. A. West University of California at Santa Barbara, Santa Barbara, California 93106, USA A. M. Eisner, J. Kroseberg, W. S. Lockman, A. J. Martinez, T. Schalk, B. A. Schumm, and A. Seiden University of California at Santa Cruz, Institute for Particle Physics, Santa Cruz, California 95064, USA C. H. Cheng, D. A. Doll, B. Echenard, K. T. Flood, D. G. Hitlin, P. Ongmongkolkul, F. C. Porter, and A. Y. Rakitin California Institute of Technology, Pasadena, California 91125, USA R. Andreassen, M. S. Dubrovin, B. T. Meadows, and M. D. Sokoloff University of Cincinnati, Cincinnati, Ohio 45221, USA P. C. Bloom, W. T. Ford, A. Gaz, M. Nagel, U. Nauenberg, J. G. Smith, and S. R. Wagner University of Colorado, Boulder, Colorado 80309, USA R. Ayad and W. H. Toki Colorado State University, Fort Collins, Colorado 80523, USA
منابع مشابه
Measurements 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 کاملBranching fractions and direct CP asymmetries of charmless decay modes at the Tevatron
We present new CDF results on the branching fractions and time-integrated direct CP asymmetries for B and B s decay modes into pairs of charmless charged hadrons (pion or kaon). The data set for this update amounts to 1 fb of p̄p collisions at √ s = 1.96 TeV. We report the first observation of the B s → K π mode and a measurement of its branching fraction and direct CP asymmetry. We also observe...
متن کاملHadronic B Decays at BABAR
The BABAR collaboration has performed a number of measurements on hadronic B decays to charmonium and open charm mesons. Preliminary results based on a sample of nearly 23 million BB pairs, collected between October 1999 and October 2000, are reviewed. These include measurements of exclusive branching fractions and ratios of branching fractions, as well as angular distributions.
متن کاملB Physics Overview: Rare Hadronic and Radiative Decays
I discuss three B physics results with potential for exhibiting new flavourchanging interactions: (1) the time-dependent CP asymmetry in B → J/ψKS decay; (2) branching fractions and CP asymmetries in B → ππ, πK decays; (3) inclusive and exclusive semi-hadronic b → s transitions.
متن کاملCharmless non - leptonic B s decays to PP , PV and V V final states in the pQCD approach
Abstract We calculate the CP-averaged branching ratios and CP-violating asymmetries of a number of two-body charmless hadronic decays B0 s → PP,PV, V V in the perturbative QCD (pQCD) approach to leading order in αs (here P and V denote light pseudoscalar and vector mesons, respectively). The mixinginduced CP violation parameters are also calculated for these decays. We also predict the polariza...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2011