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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

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.eps
Figure image (.pdf)
CrossSection_vs_Npart.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.

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