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# EPS-HEP2021 conference

Jul 26 – 30, 2021
Zoom
Europe/Berlin timezone

## Influence of scattering versus coherent parton branching on the $k_T$ broadening of QCD cascades in a medium

Jul 26, 2021, 11:15 AM
15m
Zoom

#### Zoom

Parallel session talk Heavy Ion Physics

### Speaker

Martin Rohrmoser (Institute of Nuclear Physics, Polish Academy of Sciences)

### Description

Heavy ion collisions at high energies can be used as an interesting way to recreate and study the medium of the quark-gluon plasma (QGP).
We particularly investigate how jets produced in hard binary collisions evolve within a tentative medium and in particular how the jet-particle momentum components $k_T$ orthogonal to the jet
axis are affected.
We evolved the jets within a medium that contains both, transverse kicks
as well as medium induced coherent radiation within the MINCAS-algorithm [1] following the works of [2,3].
In this framework parton branching occurs simultaneously to scatterings within the medium, leading to the interference effects that reproduce the well known BDMPS-Z emission rates and sizeable $k_T$ broadening.
It is, thus, interesting to study the relative importances of $k_T$ broadening from the coherent splittings and different types of in-medium scatterings.
We find a clear hierarchy of the influences from different scattering effects and deflections during branchings:
While scattering still yields the largest contributions to broadening, the branching effects are comparable in size.
We also observed that the $k_T$ distributions in our results differ considerably from a Gaussian distribution in transverse momentum.

References:
[1] K. Kutak, W. Płaczek, R. Straka, Eur.Phys.J. C79 (2019) no.4, 317
[2] J.-P. Blaizot, F. Dominguez, E. Iancu, Y. Mehtar-Tani, JHEP 1301 (2013) 143
[3] J.-P. Blaizot, F. Dominguez, E. Iancu, Y. Mehtar-Tani, JHEP 1406 (2014) 075

First author Martin Rohrmoser mrohrmoser@ifj.edu.pl jet phenomenology in QGP

### Primary authors

Martin Rohrmoser (Institute of Nuclear Physics, Polish Academy of Sciences) Etienne Blanco (Institute of Nuclear Physics, Polish Academy of Sciences) Dr Robert Straka (AGH, Cracow) Prof. Wiesław Płaczek (Jagiellonian University, Cracow) Dr Krzysztof Kutak (Institute of Nuclear Physics, Polish Academy of Sciences)