May 16 – 20, 2022
Europe/Zurich timezone

Nuclear modification factors of prompt and non-prompt J/ψ in Pb–Pb collisions at √ sNN= 5.02 TeV at midrapidity with ALICE

May 17, 2022, 7:00 PM
Experimental poster Heavy Ions Poster Session I


Mr Himanshu Sharma (Polish Academy of Sciences (PL))


Heavy quarks are considered excellent probes to study the properties of the state of matter where quarks and gluons are deconfined, known as quark-gluon plasma (QGP). The QGP is expected to be formed in ultrarelativistic nuclear collisions. Non-prompt J/$\psi$ measurements are important to investigate the parton energy loss in the hot medium and its quark mass dependence, as they provide additional constraints to extract heavy-quark diffusion coefficients from experimental data. In addition, the prompt J/$\psi$ production provides a direct comparison with models that include (re-)generation, which is found to be the dominant production mechanism at low transverse momentum ($p_{\rm T}$) and in central collisions at the LHC. ALICE has unique tracking and particle identification capabilities down to very low momentum at midrapidity ($|y|<$ 0.9), enabling the separation of prompt and non-prompt J/$\psi$ down to $p_{\rm T}$ $\sim$ 1.5 GeV/$c$ in Pb$-$Pb collisions. In this contribution, recent ALICE results on nuclear modification factors ($R_{\rm AA}$) of prompt and non-prompt J/$\psi$, reconstructed at midrapidity in the dielectron decay channel, as a function of $p_{\rm T}$ and centrality will be presented and compared with theoretical predictions. Presented results are obtained by analyzing data from Pb$-$Pb collisions collected at $\sqrt{s_{\rm NN}}$ = 5.02 TeV during the LHC Run 2. Moreover, results will be compared with similar LHC measurements, available at higher $p_{\rm T}$.

Primary author

Mr Himanshu Sharma (Polish Academy of Sciences (PL))

Presentation materials