# 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!

## Angular correlations between J/$\psi$ mesons and charged hadrons in proton-proton collisions at $\sqrt{s}$ = 13 TeV with ALICE

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

Poster Quarkonia

### Speaker

Lucas Altenkamper (University of Bergen (NO))

### Description

Due to the different energy scales involved in the production of charmonium states in proton-proton collisions, they provide important testing grounds for the theory of Quantum Chromo-Dynamics (QCD). The initial charm-quark pairs are produced in large-$Q^2$ processes that allow for a perturbative treatment while the hadronization into a bound system is non-perturbative.

Different effective theories for the description of charmonium production exist, like the Color Singlet Model, the Color Evaporation Model or the non-relativistic QCD approach. However, none of them describes the production cross-sections and the polarization simultaneously. The correlations of J$/\psi$ mesons and hadrons can provide constraints on the color-singlet or color-octet nature of the pre-resonant charmonium state by measuring the amount of hadronic activity in the vicinity of the J$/\psi$.

In this poster, preliminary ALICE results on the angular correlations between inclusive J$/\psi$ mesons and charged hadrons at mid-rapidity in pp collisions at $\sqrt{s} = 13~\text{TeV}$ will be shown. The high multiplicity triggered data taken by ALICE in Run-2 allows for measurements in high multiplicity events, in addition to the analysis of minimum-bias data. Projections for the LHC Run-3 and Run-4 will also be reported. Our measurements will be compared to model calculations.

Collaboration ALICE Presenter name already specified Experiment

### Primary author

Lucas Altenkamper (University of Bergen (NO))

### Presentation Materials

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