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Measurement of the prompt $J/\psi$ pair production cross-section in $pp$ collisions at $\sqrt{s} = 8$ TeV with the ATLAS detector

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Academic year: 2021

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Figure 1: Examples of Feynman diagrams of prompt–prompt J/ψ pair production in pp collisions for (a) leading- leading-order production and (b) next-to-leading-order production in which the circle represents the J/ψ meson produced in a colour-singlet state,
Figure 2: The 1-D projections of the non-weighted invariant mass spectrum fit of the leading J/ψ in the (a) central and (b) forward rapidity regions as well as the sub-leading J/ψ in the (c) central and (d) forward rapidity regions.
Figure 3: The background-subtracted non-weighted transverse decay length spectra, L xy 1 and L xy 2 , of the lead- lead-ing and sub-leadlead-ing J/ψ mesons
Figure 4: The PP weight bias correction as a function of the reconstructed f PP in the (a) central and (b) forward rapidity regions for di ff erent variables
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