Observation of \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$B^{0}_{s}$\end{document}–\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\overline{B}{}^{0}_{s}$\end{document} mixing and measurement of mixing frequencies using semileptonic B decays

被引:0
作者
R. Aaij
B. Adeva
M. Adinolfi
C. Adrover
A. Affolder
Z. Ajaltouni
J. Albrecht
F. Alessio
M. Alexander
S. Ali
G. Alkhazov
P. Alvarez Cartelle
A. A. Alves
S. Amato
S. Amerio
Y. Amhis
L. Anderlini
J. Anderson
R. Andreassen
J. E. Andrews
F. Andrianala
R. B. Appleby
O. Aquines Gutierrez
F. Archilli
A. Artamonov
M. Artuso
E. Aslanides
G. Auriemma
M. Baalouch
S. Bachmann
J. J. Back
C. Baesso
V. Balagura
W. Baldini
R. J. Barlow
C. Barschel
S. Barsuk
W. Barter
Th. Bauer
A. Bay
J. Beddow
F. Bedeschi
I. Bediaga
S. Belogurov
K. Belous
I. Belyaev
E. Ben-Haim
G. Bencivenni
S. Benson
J. Benton
机构
[1] CERN,Center for High Energy Physics
[2] Centro Brasileiro de Pesquisas Físicas (CBPF),LAPP, Université de Savoie
[3] Universidade Federal do Rio de Janeiro (UFRJ),Clermont Université, Université Blaise Pascal
[4] Tsinghua University,CPPM, Aix
[5] CNRS/IN2P3,Marseille Université
[6] CNRS/IN2P3,LAL, Université Paris
[7] LPC,Sud
[8] CNRS/IN2P3,LPNHE, Université Pierre et Marie Curie, Université Paris Diderot
[9] CNRS/IN2P3,Fakultät Physik
[10] CNRS/IN2P3,Physikalisches Institut
[11] Technische Universität Dortmund,School of Physics
[12] Max-Planck-Institut für Kernphysik (MPIK),Faculty of Physics and Applied Computer Science
[13] Ruprecht-Karls-Universität Heidelberg,Institute of Nuclear Physics
[14] University College Dublin,Physik
[15] Sezione INFN di Bari,Institut
[16] Sezione INFN di Bologna,H.H. Wills Physics Laboratory
[17] Sezione INFN di Cagliari,Cavendish Laboratory
[18] Sezione INFN di Ferrara,Department of Physics
[19] Sezione INFN di Firenze,School of Physics and Astronomy
[20] Laboratori Nazionali dell’INFN di Frascati,School of Physics and Astronomy
[21] Sezione INFN di Genova,Oliver Lodge Laboratory
[22] Sezione INFN di Milano Bicocca,School of Physics and Astronomy
[23] Sezione INFN di Padova,Department of Physics
[24] Sezione INFN di Pisa,Institut für Physik
[25] Sezione INFN di Roma Tor Vergata,undefined
[26] Sezione INFN di Roma La Sapienza,undefined
[27] Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences,undefined
[28] AGH - University of Science and Technology,undefined
[29] National Center for Nuclear Research (NCBJ),undefined
[30] Horia Hulubei National Institute of Physics and Nuclear Engineering,undefined
[31] Petersburg Nuclear Physics Institute (PNPI),undefined
[32] Institute of Theoretical and Experimental Physics (ITEP),undefined
[33] Moscow State University (SINP MSU),undefined
[34] Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN),undefined
[35] Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University,undefined
[36] Institute for High Energy Physics (IHEP),undefined
[37] Universitat de Barcelona,undefined
[38] Universidad de Santiago de Compostela,undefined
[39] European Organization for Nuclear Research (CERN),undefined
[40] Ecole Polytechnique Fédérale de Lausanne (EPFL),undefined
[41] Universität Zürich,undefined
[42] Nikhef National Institute for Subatomic Physics,undefined
[43] Nikhef National Institute for Subatomic Physics and VU University Amsterdam,undefined
[44] NSC Kharkiv Institute of Physics and Technology (NSC KIPT),undefined
[45] Institute for Nuclear Research of the National Academy of Sciences (KINR),undefined
[46] University of Birmingham,undefined
[47] University of Bristol,undefined
[48] University of Cambridge,undefined
[49] University of Warwick,undefined
[50] STFC Rutherford Appleton Laboratory,undefined
来源
The European Physical Journal C | 2013年 / 73卷 / 12期
关键词
Decay Time; Invariant Mass; Systematic Uncertainty; Semileptonic Decay; Combinatorial Background;
D O I
10.1140/epjc/s10052-013-2655-8
中图分类号
学科分类号
摘要
The \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$B^{0}_{s}$\end{document} and B0 mixing frequencies, Δms and Δmd, are measured using a data sample corresponding to an integrated luminosity of 1.0 fb−1 collected by the LHCb experiment in pp collisions at a centre of mass energy of 7 TeV during 2011. Around 1.8×106 candidate events are selected of the type \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$B^{0}_{(s)} \to D^{-}_{(s)} \mu^{+}$\end{document} (+ anything), where about half are from peaking and combinatorial backgrounds. To determine the B decay times, a correction is required for the momentum carried by missing particles, which is performed using a simulation-based statistical method. Associated production of muons or mesons allows us to tag the initial-state flavour and so to resolve oscillations due to mixing. We obtain \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document} $$\begin{aligned} &\Delta m_s = \bigl( 17.93 \pm0.22\textrm{(stat)} \pm0.15 \textrm{(syst)}\bigr)~\textrm{ps}^{-1}, \\ &\Delta m_d = \bigl( 0.503 \pm0.011\textrm{(stat)} \pm0.013 \textrm{(syst)}\bigr)~\textrm{ps}^{-1}. \end{aligned}$$ \end{document}
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