12th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions

Modification of jets travelling through a brick-like medium

24 Sept 2024, 16:35

1h 55m

DEJIMA MESSE NAGASAKI

Poster 1. Jets modification and medium response Poster Session

Speaker

Chiara Le Roux

Description

The present work addresses the puzzle related to the observation of collective flow in collisions of small systems (which indicates the presence of a medium even in such collisions) and the absence of jet quenching in such systems (which would not be expected if jets are traversing a medium). This study has been done using the JEWEL event generator with a ``brick"-like medium. This simplified medium is made up of a collection of gluons at a given temperature and density distributed in an elliptical or spherical volume. A pair of jets is then created in the center of this medium and, as the jets evolve, the number of jet-medium interactions is counted. This way, we were able to study how R${}_{\text{AA}}$ and v${}_2$ vary with the number of jet-medium interactions independently from any models for medium expansion and evolution.

What we have found is that, for different eccentricities of an ellipsoidal medium, a v${}_2$ signal can be obtained with a smaller number of jet-medium interactions than are necessary to obtain a signal in R${}_{\text{AA}}$. This indicates that, if there is a medium being created in collisions of small systems, it is possible that the volume of such a medium is large enough for the creation of collective flow but not large enough to give rise to an R${}_{\text{AA}}$ signal. A paper containing these results is in preparation and will soon be published on Arxiv and submitted to a journal for peer review.

Presentation materials

poster-final.pdf