The production cross section of inclusive J/$\psi$ pairs in pp collisions at a centre-of-mass energy $\sqrt{s} = 13$ TeV is measured with ALICE. The measurement is performed for J/$\psi$ in the rapidity interval $2.5 <~ y <~ 4.0$ and for transverse momentum $p_{\rm T} > 0$. The production cross section of inclusive J/$\psi$ pairs is reported to be $10.3 \pm 2.3 {\rm (stat.)} \pm 1.3 {\rm (syst.)}$ nb in this kinematic interval. The contribution from non-prompt J/$\psi$ (i.e. originated from beauty-hadron decays) to the inclusive sample is evaluated. The effective double-parton scattering cross section is computed, neglecting the single-parton scattering contribution.
Phys. Rev. C 108 (2023) 045203
HEP Data
e-Print: arXiv:2303.13431 | PDF | inSPIRE
CERN-EP-2023-053
Figure group
Figure 1
Projections of a fit to the 2-dimensional invariant mass distribution for inclusive J/$\psi$ pair candidates for (a) $m_1(\mu_1^+ \mu_1^-)$ and (b) $m_2(\mu_2^+ \mu_2^-)$. The (black) markers show data. The (black) solid line represents the total fit function. The (blue and green) dashed-dotted lines indicate the background contribution from a combination of a real J/$\psi$ signal with a combinatorial candidate. The (yellow) dotted line represents muon pairs from combinatorial background. |  |