Evidence for simultaneous production of $J/\psi$ and ${\rm Y}$ mesons

Abstract

We report evidence for the simultaneous production of $J/\psi$ and ${\rm Y}$ mesons in 8.1 fb${}^{-1}$ of data collected at $\sqrt{s}=$1.96 TeV by the D0 experiment at the Fermilab $p\bar{p}$ Tevatron Collider. Events with these characteristics are expected to be produced predominantly by gluon-gluon interactions. In this analysis, we extract the effective cross section characterizing the initial parton spatial distribution, $σ_{eff}=2.2\pm 0.7\mbox{(stat)} \pm 0.9 \mbox{(syst)} ~\mbox{mb}$.

8 pages, 3 figures

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• Measurement of prompt J/psi pair production in pp collisions at sqrt(s) = 7 TeV
• Observation and measurements of the production of prompt and non-prompt $J/\psi$ mesons in association with a $Z$ boson in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Double-quarkonium production at a fixed-target experiment at the LHC (AFTER@LHC)
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