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Observation of the decay $\mathrm{Z}\to\psi\,\ell^+\ell^-$ in $\mathrm{pp}$ collisions at $\sqrt{s}=13\,\mathrm{TeV}$
The observation is presented of the $\mathrm{Z}$ boson rare decay to a $\psi$ meson and two oppositely charged same-flavor leptons, $\ell^+ \ell^-$, where $\psi$ represents the sum of $\mathrm{J}/\psi$ and $\psi(\mathrm{2S})\to\mathrm{J}/\psi\,X$, and $\ell=\mu,\mathrm{e}$. The data sample of proton...
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2018
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| Acceso en línea: | http://cds.cern.ch/record/2308113 |