@article{e5bdf07463334fd1a60cfe688f2e86b2,
title = "Disentangling Sources of Momentum Fluctuations in (Formula presented) and (Formula presented) Collisions with the ATLAS Detector",
abstract = "High-energy nuclear collisions create a quark-gluon plasma, whose initial condition and subsequent expansion vary from event to event, impacting the distribution of the eventwise average transverse momentum [(Formula presented)]. Disentangling the contributions from fluctuations in the nuclear overlap size (geometrical component) and other sources at a fixed size (intrinsic component) remains a challenge. This problem is addressed by measuring the mean, variance, and skewness of (Formula presented) in (Formula presented) and (Formula presented) collisions at (Formula presented) and 5.44 TeV, respectively, using the ATLAS detector at the LHC. All observables show distinct features in ultracentral collisions, which are explained by a suppression of the geometrical component as the overlap area reaches its maximum. These results demonstrate a new technique to separate geometrical and intrinsic fluctuations, providing constraints on initial conditions and properties of the quark-gluon plasma, such as the speed of sound.",
author = "{ATLAS Collaboration} and Green, {M. J.} and J. Zhang and Y. Fang and S. Hassan and H. Wang and Liu, {E. H.L.} and Herrmann, {L. M.} and S. Solomon and Das, {S. J.} and Chapman, {J. D.} and S. Williams and D. Francis and Smith, {A. C.} and Williams, {D. M.} and Y. Yang and Lee, {S. C.} and M. Barakat and Y. He and Z. Wang and Z. Xu and Y. Chen and Li, {C. Q.} and X. Liu and Liu, {Y. L.} and W. Ma and Y. Wang and L. Zhang and C. Feng and Liu, {Y. L.} and X. Zhang and J. Chen and J. Li and L. Li and X. Wang and Y. Zhang and S. Huang and Lu, {Y. J.} and S. Zhang and J. Martin and Mclaughlin, {D. J.} and Kennedy, {P. D.} and X. Li and McDonald, {E. F.} and Li, {C. Q.} and Liu, {Y. L.} and M. Losada and A. Haas and Mincer, {A. I.} and R. Xu and Johnson, {J. W.} and Miller, {E. H.} and Lee, {S. C.} and Han, {Y. F.} and Park, {T. H.} and Smith, {D. R.} and M. Atkinson and Brown, {L. M.} and K. Becker and A. Mitra and K. Cranmer",
note = "Publisher Copyright: {\textcopyright} 2024 CERN, for the ATLAS Collaboration.",
year = "2024",
month = dec,
day = "20",
doi = "10.1103/PhysRevLett.133.252301",
language = "English (US)",
volume = "133",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "25",
}