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Coherent $ J/\psi$ cross section at midrapidity in Pb-Pb collisions at $\sqrt{s_{\mathrm {NN}}}$ =5.02 TeV in 40-50%, 50-70% and 70-90% centrality classes compared to models

Figure Information
Scope: PWG
PWG-DQ (Dileptons and Quarkonia)
Energy
5.02 TeV
System
Pb-Pb
Figure Group
Low $p_{T}$ $J/\psi$ excess at midrapidity in peripheral Pb-Pb collisions at 5.02 TeV with full Run 2 + projections for Run3/4 (QM2022)
Figure Image
Figure image (.eps)
CrossSection_vs_Npart_vs_Models_v2.eps
Figure image (.pdf)
CrossSection_vs_Npart_vs_Models_v2.pdf
Figure Caption

Coherent  $ J/\psi$ cross section as a function of  $< N_{part}>$ in Pb--Pb collisions at  $\sqrt{s_{NN}}$ =5.02 TeV measured at midrapidity for p_{T} < 0.2 GeV/c.The statistical and the uncorrelated systematic uncertainties are shown as bars and boxes, respectively. The correlated systematic uncertainties are quoted in the legend. Results are compared to theoretical calculations.

Detail description

Data sample: full Run 2 data (LHC18q, LHC18r, LHC15o )

Reconstruction pass: pass 3 for LHC18q and LHC18r, pass 1 for LHC15o

Event selection:

- |vtx z| < 10 cm

- Physics selection

- Pileup cut

-  Minimum bias or semi-central trigger (available only for 2018 data set)

Track cuts:

1 .|eta|<0.9

2. total momentum of the electron candidates, p> 1 GeV/c