Medium-Induced Modification of $Z$-Tagged Charged Particle Yields in $Pb+Pb$ Collisions at 5.02 TeV with the ATLAS Detector - INSPIRE

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Medium-Induced Modification of $Z$ -Tagged Charged Particle Yields in $Pb+Pb$ Collisions at 5.02 TeV with the ATLAS Detector

ATLAS

Collaboration

Aug 22, 2020

20 pages

Published in:

Phys.Rev.Lett. 126 (2021) 7, 072301

Published: Feb 20, 2021

e-Print:

2008.09811 [nucl-ex]

DOI:

10.1103/PhysRevLett.126.072301

Report number:

CERN-EP-2020-148

Experiments:

CERN-LHC-ATLAS

View in:

reference search36 citations

Citations per year

Abstract: (APS)

The yield of charged particles opposite to a Z boson with large transverse momentum (pT) 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 pT in a way that depends on event centrality and Z boson pT. The data are compared with a variety of theoretical calculations and provide new information about the medium-induced energy loss of partons in a pT regime difficult to measure through other channels.

Note:

28 pages in total, author list starting page 12, 3 figures, published in Phys. Rev. Lett. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2019-05/

Nuclear Physics
charged particle: yield
parton: energy loss
quark gluon: plasma
heavy ion: scattering
ATLAS
transverse momentum
CERN LHC Coll
kinematics
5020 GeV-cms/nucleon

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Figures(3)

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