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Ratio of coherent $ J/\psi$ cross section measured in collisions with nuclear overlap over ultraperipheral Pb-Pb collisions at forward and midrapidity

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)
RelativeCrossSection_vs_Npart_midy_forwardy_scaled.eps
Figure image (.pdf)
RelativeCrossSection_vs_Npart_midy_forwardy_scaled.pdf
Figure Caption

Ratio of coherent  $ J/\psi$ cross section measured in collisions with nuclear overlap  over ultraperipheral Pb-Pb collisions at forward and midrapidity. The $J/\psi$ cross section in collisions with nuclear overlap is normalised to the centrality interval width ($\Delta \rm C$).

Detail description

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

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

Forward rapidity :

Reconstruction pass: muon_calo_pass1 for 2015 and muon_calo_pass3 for 2018.

analysis note:

https://alice-notes.web.cern.ch/node/1102