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Evidence of medium response to hard probes using correlations of Z bosons with hadrons in heavy ion collisions

Chekhovsky, V.; Hayrapetyan, A.; Makarenko, V.; Tumasyan, A.; Adam, W.; Andrejkovic, J. W.; Benato, L.; Bergauer, T.; Chatterjee, S.; Damanakis, K.; Dragicevic, M.; Hussain, P. S.; Jeitler, M.; Krammer, N.; Li, A.; Liko, D.; Mikulec, I.; Schieck, J.; Schöfbeck, R.; ... mehr

Abstract:

The first measurement of pseudorapidity and azimuthal angle distributions relative to the momentum vector of a Z boson for low transverse momentum (𝑝T) charged hadrons in lead-lead (PbPb) collisions is presented. By studying the hadrons produced in an event with a high-𝑝$_T$ Z boson (40 < 𝑝$_T$ < 350 GeV), the analysis probes how the quark-gluon plasma (QGP) medium created in these collisions affects the parton recoiling opposite to the Z boson. Utilizing PbPb data at a nucleon-nucleon center-of-mass energy √𝑠$_{NN}$ = 5.02 TeV from 2018 with an integrated luminosity of 1.67 nb$^{−1}$ and proton-proton (pp) data at the same energy from 2017 with 301 pb$^{−1}$, the distributions are examined in bins of charged-hadron 𝑝T. A significant modification of the distributions for charged hadrons in the range 1 < 𝑝$_T$ < 2 GeV in PbPb collisions is observed when compared to reference measurements from pp collisions. The data provide new information about the correlation between hard and soft particles in heavy ion collisions, which can be used to test predictions of various jet quenching models. When compared with theoretical predictions, the results are consistent with expectations of a hydrodynamic wake created when the QGP is depleted of energy by the parton propagating through it. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000191743
Veröffentlicht am 27.03.2026
Originalveröffentlichung
DOI: 10.1016/j.physletb.2025.140120
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Astroteilchenphysik (IAP)
Institut für Experimentelle Teilchenphysik (ETP)
Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Scientific Computing Center (SCC)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 03.2026
Sprache Englisch
Identifikator ISSN: 0370-2693
KITopen-ID: 1000191743
Erschienen in Physics Letters B
Verlag North-Holland Publishing
Band 874
Seiten Art.-Nr.: 140120
Vorab online veröffentlicht am 25.12.2025
Nachgewiesen in Web of Science
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