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Title: Long-Range Transverse-Momentum Correlations and Radial Flow in Pb-Pb Collisions at the LHC

Journal Article · · Physical Review Letters
DOI: https://doi.org/10.1103/l36g-6f46 · OSTI ID:3029520
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This Letter presents measurements of long-range transverse-momentum correlations using a new observable, 𝑣0⁡(𝑝T), serving as a probe of event-by-event radial-flow fluctuations, the underlying radial expansion, and the medium’s properties in heavy-ion collisions. Results are reported for inclusive charged particles, pions, kaons, and protons across various centrality intervals in Pb-Pb collisions at $$\sqrt{𝑠_{\textrm{NN}}}$$ = 5.02 TeV, recorded by the ALICE detector. A pseudorapidity-gap technique, similar to that used in anisotropic-flow studies, is employed to suppress short-range correlations. At low 𝑝T, a characteristic mass ordering consistent with hydrodynamic collective flow is observed. At higher 𝑝T (>3 GeV/𝑐), protons exhibit larger 𝑣0⁡(𝑝T) than pions and kaons, in agreement with expectations from quark-recombination models. Comparisons to viscous hydrodynamic calculations with varying bulk viscosity and equation of state demonstrate the sensitivity of the 𝑣0⁡(𝑝T) observable to these key medium properties. The findings establish 𝑣0⁡(𝑝T) as a valuable addition to the set of observables used in Bayesian analyses for extracting the transport properties and constraining the equation of state of strongly interacting matter, while also helping to systematically explore its sensitivity and impact within such global studies.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Grant/Contract Number:
AC02-05CH11231; AC05-00OR22725
OSTI ID:
3029520
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 3 Vol. 136; ISSN 1079-7114; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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