Abstract
We present the results of a search for leptons produced in coincidence with a prompt muon in neutron-beryllium collisions at 300 GeV/c. The experiment was sensitive to trigger muons and associated leptons of both low momentum and low transverse momentum. A clear ${\ensuremath{\mu}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\mu}}^{\ensuremath{\mp}}$ signal was found, but no significant ${\ensuremath{\mu}}^{\ifmmode\pm\else\textpm\fi{}}{e}^{\ensuremath{\mp}}$ signal was observed. We report an upper limit for associated charmed-particle production [${\ensuremath{\sigma}}_{C\overline{C}}\ifmmode\cdot\else\textperiodcentered\fi{}B(C\ensuremath{\rightarrow}\ensuremath{\mu}+X)\ifmmode\cdot\else\textperiodcentered\fi{}B(C\ensuremath{\rightarrow}e+X)$] of 340 nb/nucleon, at the 95% confidence level.
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