Search for the Rare Decays B s 0 → e + e − and B 0 → e + e −
Physical Review Letters, vol. 124, pp. 211802
Abstract
A search for the decays ${B}_{s}^{0}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}$ and ${B}^{0}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}$ is performed using data collected with the LHCb experiment in proton-proton collisions at center-of-mass energies of 7, 8, and 13 TeV, corresponding to integrated luminosities of 1, 2, and $2\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, respectively. No signal is observed. Assuming no contribution from ${B}^{0}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}$ decays, an upper limit on the branching fraction $\mathcal{B}({B}_{s}^{0}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}})<9.4(11.2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}9}$ is obtained at 90(95)% confidence level. If no ${B}_{s}^{0}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}$ contribution is assumed, a limit of $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}})<2.5(3.0)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}9}$ is determined at 90(95)% confidence level. These upper limits are more than one order of magnitude lower than the previous values.
Authors 30
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Affiliation as printed
Physik-Institut, Universität Zürich, Zürich, Switzerland
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University of Michigan · Syracuse University
Affiliation as printed
University of Michigan, Ann Arbor, USA (associated with Syracuse University, Syracuse, New York, USA)
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Istituto Nazionale di Fisica Nucleare, Sezione di Milano
Affiliation as printed
INFN Sezione di Milano, Milano, Italy
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Los Alamos National Laboratory
Affiliation as printed
Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA
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Institut de Ciències del Cosmos · Universitat de Barcelona
Affiliation as printed
ICCUB, Universitat de Barcelona, Barcelona, Spain
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Universidade Federal do Rio de Janeiro
Affiliation as printed
Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
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Affiliation as printed
Syracuse University, Syracuse, New York, USA
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Affiliation as printed
Physik-Institut, Universität Zürich, Zürich, Switzerland
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Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
Affiliation as printed
INFN Sezione di Ferrara, Ferrara, Italy
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Istituto Nazionale di Fisica Nucleare, Sezione di Genova · European Organization for Nuclear Research
Affiliation as printed
European Organization for Nuclear Research (CERN), Geneva, Switzerland
INFN Sezione di Genova, Genova, Italy
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Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
Affiliation as printed
INFN Sezione di Pisa, Pisa, Italy
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Yandex School of Data Analysis · Yandex (Russia)
Affiliation as printed
Yandex School of Data Analysis, Moscow, Russia
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Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari
Affiliation as printed
INFN Sezione di Cagliari, Monserrato, Italy
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Kurchatov Institute · Institute for High Energy Physics
Affiliation as printed
Institute for High Energy Physics NRC Kurchatov Institute (IHEP NRC KI), Protvino, Russia, Protvino, Russia
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Kurchatov Institute · Institute for Theoretical and Experimental Physics
Affiliation as printed
Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia, Moscow, Russia
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Istituto Nazionale di Fisica Nucleare · Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
Affiliation as printed
INFN Laboratori Nazionali di Frascati, Frascati, Italy
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Centre National de la Recherche Scientifique · Sorbonne Université · Laboratoire de Physique Nucléaire et de Hautes Énergies · Institut National de Physique Nucléaire et de Physique des Particules
Affiliation as printed
LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France
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Lomonosov Moscow State University
Affiliation as printed
Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia
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Centre National de la Recherche Scientifique · Sorbonne Université · Laboratoire de Physique Nucléaire et de Hautes Énergies · Institut National de Physique Nucléaire et de Physique des Particules
Affiliation as printed
LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France
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Affiliation as printed
Physik-Institut, Universität Zürich, Zürich, Switzerland
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Istituto Nazionale di Fisica Nucleare, Sezione di Bologna
Affiliation as printed
INFN Sezione di Bologna, Bologna, Italy
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Affiliation as printed
H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
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Affiliation as printed
Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
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Centre National de la Recherche Scientifique · Sorbonne Université · Laboratoire de Physique Nucléaire et de Hautes Énergies · Institut National de Physique Nucléaire et de Physique des Particules
Affiliation as printed
LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France
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Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
Affiliation as printed
INFN Sezione di Firenze, Firenze, Italy
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Affiliation as printed
Syracuse University, Syracuse, New York, USA
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Universidade de Santiago de Compostela
Affiliation as printed
Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
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Yandex School of Data Analysis · Yandex (Russia)
Affiliation as printed
Yandex School of Data Analysis, Moscow, Russia
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Institute of Nuclear Physics, Polish Academy of Sciences
Affiliation as printed
Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
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Affiliation as printed
Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
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