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Journal Article

Medium-induced modification of $Z$-tagged charged particle yields in Pb+Pb collisions at 5.02 TeV with the ATLAS detector

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ATLAS Collaboration, 
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

ATLAS Collaboration (2021). Medium-induced modification of $Z$-tagged charged particle yields in Pb+Pb collisions at 5.02 TeV with the ATLAS detector. Physical Review Letters, 126, 072301. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2020-162.


Cite as: https://hdl.handle.net/21.11116/0000-000A-1A4A-7
Abstract
The yield of charged particles opposite to a $Z$ boson with large transverse momentum ($p_{T}$) is measured in 260 pb$^{-1}$ of $pp$ and 1.7 nb$^{-1}$ of Pb+Pb collision data at 5.02 TeV per nucleon pair recorded with the ATLAS detector at the Large Hadron Collider. The $Z$ boson tag is used to select hard-scattered partons with specific kinematics, and to observe how their showers are modified as they propagate through the quark-gluon plasma created in Pb+Pb collisions. Compared with $pp$ collisions, charged-particle yields in Pb+Pb collisions show significant modifications as a function of charged-particle $p_{T}$ in a way that depends on event centrality and $Z$ boson $p_{T}$. The data are compared with a variety of theoretical calculations and provide new information about the medium-induced energy loss of partons in a $p_{T}$ regime difficult to measure through other channels.