Production of $J/\psi$ meson in jets at mid-rapidity in pp collisions at $\sqrt{s}$ = 13 TeV with ALICE

4 Nov 2019, 17:40
20m
Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Poster Presentation Heavy flavor and quarkonium Poster Session

Speaker

Mr Yitao Wu (University of Science and Technology of China (CN))

Description

The production of quarkonia in hadron-hadron collisions occurs at the transition between the perturbative and nonperturbative regimes of QCD, resulting in a rich phenomenology that remains far from being fully understood. $J/\psi$ hadronization dynamics can be studied by measuring the $p_{T}$ fraction, $z \equiv p_{T,J/\psi} / p_{T,jet}$, carried by the $J/\psi$ meson detected inside a jet. The distribution of this quantity, also called fragmentation function, gives us an opportunity to investigate the dominant subprocesses responsible for $J/\psi$ production. In addition, the production of non-prompt $J/\psi$, coming from b hadron decays, inside a jet should be sensitive to the fragmentation functions of quarks and gluons into b hadrons. The fragmentation of high $p_{T}$ jets containing a $J/\psi$ meson was measured in pp collisions by LHCb and CMS Collaborations, respectively. The results surprisingly show that non-prompt $J/\psi$ in jets are well described by models, but that prompt $J/\psi$ tend to be produced at much lower $z$ than the model predicted.

In this contribution, we present the measurements of the fragmentation of jets into $J/\psi$ in pp collisions at $\sqrt{s}$ = 13 TeV using the data collected by ALICE,with the $J/\psi$ being measured at mid-rapidity in the di-electron decay channel by the central barrel detectors. Prompt and non-prompt components will be separated using the pseudo-proper decay length.

Primary author

Mr Yitao Wu (University of Science and Technology of China (CN))

Presentation Materials