Sep 5 – 10, 2021
Europe/Lisbon timezone

Non-prompt J/$\psi$ measurements at midrapidity in pp, p--Pb and Pb--Pb collisions with ALICE

Sep 7, 2021, 6:39 PM


Poster Hot and dense matter physics - QGP and heavy ion collisions Poster Session II


Mr Himanshu Sharma (Institute of Nuclear Physics, PAN)


The J/$\psi$ production is sensitive to the presence of the deconfined state of quarks and gluons, quark-gluon plasma (QGP), which is expected to form in the nuclear collisions. Measurements of J/$\psi$ meson originating from the weak decay of b-hadrons, non-prompt J/$\psi$, can provide an estimate of beauty quark production in the nuclear collisions. It is observed that production of non-prompt J/$\psi$ is modified in Pb-Pb collisions in comparison to that in pp collisions, as quantified by nuclear modification factors $(R_{\rm AA})$. It is related to several effects governed by the QGP in the Pb-Pb collisions. The measurement of nuclear modification factors for p-Pb collisions is used to assess various Cold Nuclear Matter (CNM) effects which can modify the production yields of non-prompt J/$\psi$. ALICE has excellent capabilities to reconstruct J/$\psi$ in $e^+e^-$ decay channel down to zero transverse momentum $(p_{\rm T})$. In addition, it allows the statistical separation of the non-prompt J/$\psi$ component for $p_{\rm T}$ larger than 1 GeV/c.

In this contribution, ALICE results on b$\bar{\rm b}$ production cross-sections (extrapolated from non-prompt J/$\psi$ cross-sections) in pp collisions will be presented and compared with the theoretical models. Moreover, $R_{\rm AA}$ of non-prompt J/$\psi$ as a function of transverse momentum ($p_{\rm T}$) in p-Pb collisions at the center-of-mass energy per nucleon pair $\sqrt{s_{\rm NN}}$ = 5.02 TeV will be presented and further compared with $R_{\rm AA}$ of non-prompt J/$\psi$ in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV. The obtained results will be compared with theoretical predictions.

Primary author

Mr Himanshu Sharma (Institute of Nuclear Physics, PAN)

Presentation materials