Evidence for simultaneous production of $J/\psi$ and $\Upsilon$ mesons

Abstract : We report evidence for the simultaneous production of $J/\psi$ and $\Upsilon$ 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, $\sigma_{eff}=2.2\pm 0.7\mbox{(stat)} \pm 0.9 \mbox{(syst)} ~\mbox{mb}$.
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Submitted on : Tuesday, November 10, 2015 - 7:21:57 AM
Last modification on : Tuesday, May 14, 2019 - 10:43:03 AM

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V.M. Abazov, U. Bassler, G. Bernardi, M. Besançon, D. Brown, et al.. Evidence for simultaneous production of $J/\psi$ and $\Upsilon$ mesons. Physical Review Letters, American Physical Society, 2016, 116, pp.082002 ⟨10.1103/PhysRevLett.116.082002⟩. ⟨in2p3-01226717⟩

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