$p_T$ dependence of $J/\psi$ $v_2$ for various collision systems

Scope: PWG
PWG-DQ (Dileptons and Quarkonia)
13 TeV
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$p_T$ dependence of $J/\psi$ $v_2$ for various collision systems

Detail description

$p_T$ dependence of $J/\psi$ $v_2$ for various collision systems


Data points for pp are obtained following the procedure detailed in the AN and the p-Pb analysis (Phys. Lett. B 780 (2018) 7-20)

The non-flow suppression is done through yield subtraction.

Pb-Pb results and p-Pb results are directly coming from the cited references.


For pp data, the global uncertainty of 5.9% coming from the systematics on tracklet elliptic flow was incorporated to the systematic boxes of each point.


At mid-$p_T$ (starting at 3 GeV/c), a hint of elliptic flow hierarchy between system sizes may be visible.


For pp


Central class: 0-5%

Peripheral class: 40-100%

Centrality estimator: V0M


Data sample: Run2 pp (2016 to 2018 included)


Event cuts:

N_contrib > 0

Usual PU rejection + Multiplicity dependant PU rejection

σ_(Z_(vtx, SPD) )< 0.25 cm (if SPD Vertexer)

Z_vtx |<10 cm

η_SPD within SPD acceptance

ΔΦ_tracklets<10 mrad (azimuth difference between inner and outer SPD layers) – standard


(Di)Muon selection:

R_abs  in [17.6, 89.5]

Match a trigger track  with p_T  >0.5 GeV

pDCA < 6σ

η_muon  in acceptance

Dimuon charge = 0

y_dimu  in acceptance

p_T_dimu  in [0;12]  GeV/c