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Abazov, V. M.; Abbott, B.; Acharya, B. S.; Nunnemann, T.; Sanders, M. P. (2016): Evidence for Simultaneous Production of J/ψ and Υ Mesons. In: Physical Review Letters, Vol. 116, Nr. 8, 82002
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Abstract

We report evidence for the simultaneous production of J/psi and Upsilon mesons in 8.1 fb(-1) of data collected at root s = 1.96 TeV by the D0 experiment at the Fermilab p (p) over bar 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, sigma(eff) = 2.2 +/- 0.7(stat) +/- 0.9(syst) mb.