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Disentangling Sources of Momentum Fluctuations in (Formula presented) and (Formula presented) Collisions with the ATLAS Detector

Aad, G. ; Åkesson, T.P.A. LU orcid ; Astrand, K.S.V. LU ; Doglioni, C. LU ; Ekman, P.A. LU orcid ; Hedberg, V. LU ; Herde, H. LU orcid ; Konya, B. LU ; Lytken, E. LU orcid and Poettgen, R. LU orcid , et al. (2024) In Physical Review Letters 133(25).
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... (More)
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. © 2024 CERN, for the ATLAS Collaboration. (Less)
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organization
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type
Contribution to journal
publication status
published
subject
keywords
Acoustic properties, Colliding beam accelerators, Collisionless plasmas, Elementary particle sources, Momentum, Photons, Plasma collision processes, ATLAS detectors, Energy, Fixed size, Geometrical fluctuations, Initial conditions, Mean variance, Momentum fluctuations, Nuclear collisions, Quark-gluon plasma, Transverse momenta, Collisional plasmas
in
Physical Review Letters
volume
133
issue
25
article number
252301
publisher
American Physical Society
external identifiers
  • scopus:85213010733
  • pmid:39752696
ISSN
0031-9007
DOI
10.1103/PhysRevLett.133.252301
language
English
LU publication?
yes
id
c2b3e039-2761-4d35-8e5d-d125a297e440
date added to LUP
2025-11-21 11:02:55
date last changed
2025-11-22 03:44:49
@article{c2b3e039-2761-4d35-8e5d-d125a297e440,
  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. © 2024 CERN, for the ATLAS Collaboration.}},
  author       = {{Aad, G. and Åkesson, T.P.A. and Astrand, K.S.V. and Doglioni, C. and Ekman, P.A. and Hedberg, V. and Herde, H. and Konya, B. and Lytken, E. and Poettgen, R. and Simpson, N.D. and Smirnova, O. and Wallin, E.J. and Zwalinski, L.}},
  issn         = {{0031-9007}},
  keywords     = {{Acoustic properties; Colliding beam accelerators; Collisionless plasmas; Elementary particle sources; Momentum; Photons; Plasma collision processes; ATLAS detectors; Energy; Fixed size; Geometrical fluctuations; Initial conditions; Mean variance; Momentum fluctuations; Nuclear collisions; Quark-gluon plasma; Transverse momenta; Collisional plasmas}},
  language     = {{eng}},
  number       = {{25}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Letters}},
  title        = {{Disentangling Sources of Momentum Fluctuations in (Formula presented) and (Formula presented) Collisions with the ATLAS Detector}},
  url          = {{http://dx.doi.org/10.1103/PhysRevLett.133.252301}},
  doi          = {{10.1103/PhysRevLett.133.252301}},
  volume       = {{133}},
  year         = {{2024}},
}