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Observation and studies of double J/psi production at the Tevatron

Abstract : We present the observation of doubly-produced $J/\psi$ mesons with the D0 detector at Fermilab in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV. The production cross section for both singly and doubly-produced $J/\psi$ mesons is measured using a sample with an integrated luminosity of 8.1~fb$^{-1}$. For the first time, the double $J/\psi$ production cross section is separated into contributions due to single and double parton scatterings. Using these measurements, we determine the effective cross section \sigteff, a parameter characterizing an effective spatial area of the parton-parton interactions and related to the parton spatial density inside the nucleon.
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http://hal.in2p3.fr/in2p3-01003951
Contributor : Sylvie Flores <>
Submitted on : Wednesday, June 11, 2014 - 7:04:55 AM
Last modification on : Wednesday, September 16, 2020 - 4:26:29 PM

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V.M. Abazov, G. Bernardi, D. Brown, G. Grenier, T. Kurca, et al.. Observation and studies of double J/psi production at the Tevatron. Physical Review D, American Physical Society, 2014, 90 (11), pp.111101. ⟨10.1103/PhysRevD.90.111101⟩. ⟨in2p3-01003951⟩

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