Search for Zγ events with large missing transverse energy in pp¯ collisions at s=1.96 TeV

Le résumé fourni par la source

We present the first search for new phenomena in $Z\ensuremath{\gamma}$ final states with large missing transverse energy using data corresponding to an integrated luminosity of $6.2\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected with the D0 experiment in $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$. This signature is predicted in gauge-mediated supersymmetry-breaking models, where the lightest neutralino ${\stackrel{\texttildelow{}}{\ensuremath{\chi}}}_{1}^{0}$ is the next-to-lightest supersymmetric particle and is produced in pairs, possibly through decay from heavier supersymmetric particles. The ${\stackrel{\texttildelow{}}{\ensuremath{\chi}}}_{1}^{0}$ can decay either to a $Z$ boson or a photon and an associated gravitino that escapes detection. We exclude this model at the 95% C.L. for supersymmetry-breaking scales of $\ensuremath{\Lambda}<87\text{ }\text{ }\mathrm{TeV}$.

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