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Measurement of the Sensitivity of Two-Particle Correlations in pp Collisions to the Presence of Hard Scatterings

Aad, G. ; Åkesson, T.P.A. LU orcid ; Doglioni, Caterina LU ; Ekman, Alexander LU ; Hedberg, Vincent LU ; Herde, Hannah LU orcid ; Konya, Balazs LU ; Lytken, Else LU orcid ; Pöttgen, Ruth LU orcid and Simpson, Nathan Daniel LU , et al. (2023) In Physical Review Letters 131(16).
Abstract
A key open question in the study of multiparticle production in high-energy pp collisions is the relationship between the "ridge"-i.e., the observed azimuthal correlations between particles in the underlying event that extend over all rapidities-and hard or semihard scattering processes. In particular, it is not known whether jets or their soft fragments are correlated with particles in the underlying event. To address this question, two-particle correlations are measured in pp collisions at sqrt[s]=13  TeV using data collected by the ATLAS experiment at the LHC, with an integrated luminosity of 15.8  pb^{-1}, in two different configurations. In the first case, charged particles associated with jets are excluded from the correlation... (More)
A key open question in the study of multiparticle production in high-energy pp collisions is the relationship between the "ridge"-i.e., the observed azimuthal correlations between particles in the underlying event that extend over all rapidities-and hard or semihard scattering processes. In particular, it is not known whether jets or their soft fragments are correlated with particles in the underlying event. To address this question, two-particle correlations are measured in pp collisions at sqrt[s]=13  TeV using data collected by the ATLAS experiment at the LHC, with an integrated luminosity of 15.8  pb^{-1}, in two different configurations. In the first case, charged particles associated with jets are excluded from the correlation analysis, while in the second case, correlations are measured between particles within jets and charged particles from the underlying event. Second-order flow coefficients, v_{2}, are presented as a function of event multiplicity and transverse momentum. These measurements show that excluding particles associated with jets does not affect the measured correlations. Moreover, particles associated with jets do not exhibit any significant azimuthal correlations with the underlying event, ruling out hard processes contributing to the ridge. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
article, case report, clinical article, correlation analysis, luminance
in
Physical Review Letters
volume
131
issue
16
article number
162301
publisher
American Physical Society
external identifiers
  • scopus:85176291220
  • pmid:37925689
ISSN
1079-7114
DOI
10.1103/PhysRevLett.131.162301
language
English
LU publication?
yes
id
f640042f-aa4d-42ca-9f8c-c252987a071e
date added to LUP
2024-01-16 15:27:19
date last changed
2024-01-17 03:00:58
@article{f640042f-aa4d-42ca-9f8c-c252987a071e,
  abstract     = {{A key open question in the study of multiparticle production in high-energy pp collisions is the relationship between the "ridge"-i.e., the observed azimuthal correlations between particles in the underlying event that extend over all rapidities-and hard or semihard scattering processes. In particular, it is not known whether jets or their soft fragments are correlated with particles in the underlying event. To address this question, two-particle correlations are measured in pp collisions at sqrt[s]=13  TeV using data collected by the ATLAS experiment at the LHC, with an integrated luminosity of 15.8  pb^{-1}, in two different configurations. In the first case, charged particles associated with jets are excluded from the correlation analysis, while in the second case, correlations are measured between particles within jets and charged particles from the underlying event. Second-order flow coefficients, v_{2}, are presented as a function of event multiplicity and transverse momentum. These measurements show that excluding particles associated with jets does not affect the measured correlations. Moreover, particles associated with jets do not exhibit any significant azimuthal correlations with the underlying event, ruling out hard processes contributing to the ridge.}},
  author       = {{Aad, G. and Åkesson, T.P.A. and Doglioni, Caterina and Ekman, Alexander and Hedberg, Vincent and Herde, Hannah and Konya, Balazs and Lytken, Else and Pöttgen, Ruth and Simpson, Nathan Daniel and Skorda, Eleni and Smirnova, Oxana}},
  issn         = {{1079-7114}},
  keywords     = {{article; case report; clinical article; correlation analysis; luminance}},
  language     = {{eng}},
  number       = {{16}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Letters}},
  title        = {{Measurement of the Sensitivity of Two-Particle Correlations in pp Collisions to the Presence of Hard Scatterings}},
  url          = {{http://dx.doi.org/10.1103/PhysRevLett.131.162301}},
  doi          = {{10.1103/PhysRevLett.131.162301}},
  volume       = {{131}},
  year         = {{2023}},
}