# Quark Matter 2018

13-19 May 2018
Venice, Italy
Europe/Zurich timezone
The organisers warmly thank all participants for such a lively QM2018! See you in China in 2019!

## Application of MVA methods to the analysis of prompt and non-prompt J/$\psi$ in Pb-Pb collisions with ALICE at the LHC

15 May 2018, 17:00
2h 40m
First floor and third floor (Palazzo del Casinò)

Poster Quarkonia

### Speakers

Alena Harlenderova (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE)) Lukas Layer (Ruprecht Karls Universitaet Heidelberg (DE))

### Description

J/$\psi$ mesons and other hadrons containing a charm or a beauty quark are
excellent probes to study the Quark-Gluon Plasma (QGP) produced under
extreme temperature and energy density conditions in heavy-ion collisions. Because of their large mass,
heavy quarks are produced in hard parton-scattering processes at the
beginning of the collisions and they are therefore present in the QGP
during all stages of its evolution.

At mid-rapidity ($|y|<0.8$), ALICE can reconstruct J/$\psi$ mesons via their decay
into the dielectron channel, down to zero transverse momentum $p_{\rm T}$. However,
particularly at very low $p_{\rm T}$ and in central collisions, the measurement is
limited by the low signal to background ratio. Increasing the significance of the
measurement in the low $p_{\rm T}$ region is extremely important for several reasons:
First, in the study of prompt J/$\psi$ production, higher precision will
shed light on the interplay between J/$\psi$ dissociation and regeneration.
Second,
the non-prompt J/$\psi$ analysis can give access to low $p_{\rm T}$ beauty
measurements.

Using multivariate methods helps to reduce the background and increase the
significance while keeping as much signal as possible.
A study of the multivariate methods with data from Pb--Pb collisions at
$\sqrt{s_{\rm NN}}=5.02$ TeV will be presented in this poster. Different
choices of training variables were tested, with respect to background
rejection and good stability of the efficiency corrections.

Centralised submission by Collaboration Presenter name will be specified later Experiment ALICE

### Primary authors

Alena Harlenderova (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE)) Lukas Layer (Ruprecht Karls Universitaet Heidelberg (DE))

### Presentation Materials

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