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  • PhysRevD.90.111101

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

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Article number111101
<mark>Journal publication date</mark>1/12/2014
<mark>Journal</mark>Physical Review D
Issue number1
Volume90
Number of pages9
<mark>State</mark>Published
<mark>Original language</mark>English

Abstract

We present the observation of doubly produced J/ψ mesons with the D0 detector at Fermilab in pp¯ collisions at s√=1.96  TeV. The production cross section for both singly and doubly produced J/ψ mesons is measured using a sample with an integrated luminosity of 8.1  fb−1. For the first time, the double J/ψ production cross section is separated into contributions due to single and double parton scatterings. Using these measurements, we determine the effective cross section σeff, 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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© 2014 American Physical Society