Observation of double J/$\ddot{I}ˆ$ meson production in pPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV

CMS Collaboration

The first observation of the concurrent production of two J/$\ddot{I}ˆ$ mesons in proton-nucleus collisions is presented. The analysis is based on a proton-lead (pPb) data sample recorded…