Search for decays of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>mesons into pairs of leptons:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mo>→</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mi>−</mml:mi></mml:mrow></mml:msup></mml:mrow><mml:mo>,</mml:mo></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mo>→</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi>μ</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>μ</mml:mi></mml:mrow><mml:mrow><mml:mi>−</mml:mi></mml:mrow></mml:msup></mml:mrow><mml:mo>,</mml:mo></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mo>→</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>±</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>μ</mml:mi></mml:mrow><mml:mrow><mml:mo>∓</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>

200024 citationsJournal Articlegreen Open Access

Authors

T. Bergfeld · University of Illinois Urbana-Champaign

B. I. Eisenstein · University of Illinois Urbana-Champaign

J. Ernst · University of Illinois Urbana-Champaign

G. E. Gladding · University of Illinois Urbana-Champaign

G. D. Gollin · University of Illinois Urbana-Champaign

R. M. Hans · University of Illinois Urbana-Champaign

E. Johnson

Abstract

We search for the decay of the ${B}^{0}$ meson into a pair of leptons in the suppressed channels ${B}^{0}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}},$ ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ and in the lepton number violating channel ${B}^{0}\ensuremath{\rightarrow}{e}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\mu}}^{\ensuremath{\mp}}$ in a sample of $9.7\ifmmode\times\else\texttimes\fi{}{10}^{6} B\overline{B}$ pairs recorded by CLEO detector. No signal is found, and the following upper limits on the branching fractions are established: $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}})<8.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7},$ $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}})<6.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7},$ $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}{e}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\mu}}^{\ensuremath{\mp}})<15\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7}$ at 90% confidence level. A new lower limit on the Pati-Salam leptoquark mass ${M}_{\mathrm{LQ}}>27 \mathrm{TeV}$ is established at 90% confidence level.

Topics & Keywords

Particle physics theoretical and experimental studies Dark Matter and Cosmic Phenomena Neutrino Physics Research

Publication Details

Published in: Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields

Volume 62, Issue 9

DOI: 10.1103/physrevd.62.091102

Field-Weighted Citation Impact: 4.06

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