López Pardo, VíctorRothkopf, Alexander2026-04-242026-04-242025-12López-Pardo, V., & Rothkopf, A. (2025). Towards an optimally sensitive temperature probe in heavy-ion collisions. Journal of Subatomic Particles and Cosmology, 4, 100229. 10.1016/j.jspc.2025.100229https://hdl.handle.net/10347/46971The high-precision heavy quarkonium data from LHC Run 2 and the ongoing Run 3 provide a unique window into the properties of hot nuclear matter and the Quark-Gluon Plasma (QGP). To make full use of this data, it is crucial to go beyond traditional observables such as the nuclear modification factor 𝑅𝐴𝐴 and elliptic flow 𝑣2, and instead develop new probes that are more directly sensitive to the characteristics of the medium. We adopt the open quantum systems perspective for in-medium quarkonium and take inspiration from cold atom metrology techniques to construct observables with optimal sensitivity to specific QGP parameters. Focusing on the bulk temperature, we develop such optimal observables based on the Caldeira-Leggett master equation as a simplified setup, with the goal of extending it to a full Quantum Brownian Motion Lindblad equation.eng© 2025 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license ( http://creativecommons.org/licenses/by/4.0/ ).Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/QuarkoniumQuark-gluon plasmaHard probesTemperatureOpen quantum systemsLindbladQuantum metrologyObservablesQuantum brownian motionCaldeira-Leggettjournal article10.1016/j.jspc.2025.1002293050-4805open access