Search for the flavor-changing neutral current decay D0→μ+μ− in pp¯ collisions at s=1.96TeV

Le résumé fourni par la source

We report on a search for the flavor-changing neutral current decay ${D}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ in $p\overline{p}$ collisions at $\sqrt{s}=1.96\mathrm{TeV}$ using $65{\mathrm{pb}}^{\ensuremath{-}1}$ of data collected by the CDF II experiment at the Fermilab Tevatron Collider. A displaced-track trigger selects long-lived ${D}^{0}$ candidates in the ${D}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ search channel, the kinematically similar ${D}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ channel used for normalization, the Cabibbo-favored ${D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ channel used to optimize the selection criteria in an unbiased manner, and their charge conjugates. Finding no signal events in the ${D}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ search window, we set an upper limit on the branching fraction $\mathcal{B}{(D}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}})<~2.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ $(3.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6})$ at the $90%$ (95%) confidence level.

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