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Probing Gluon Spin-Momentum Correlations in Transversely Polarized Protons through Midrapidity Isolated Direct Photons in Collisions at

Acharya, U. A. ; Oskarsson, Anders LU ; Silvermyr, David LU orcid and Zou, L. (2021) In Physical Review Letters 127(16).
Abstract
Studying spin-momentum correlations in hadronic collisions offers a glimpse into a three-dimensional picture of proton structure. The transverse single-spin asymmetry for midrapidity isolated direct photons in collisions at is measured with the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC). Because direct photons in particular are produced from the hard scattering and do not interact via the strong force, this measurement is a clean probe of initial-state spin-momentum correlations inside the proton and is in particular sensitive to gluon interference effects within the proton. This is the first time direct photons have been used as a probe of spin-momentum correlations at RHIC. The uncertainties on the results are a... (More)
Studying spin-momentum correlations in hadronic collisions offers a glimpse into a three-dimensional picture of proton structure. The transverse single-spin asymmetry for midrapidity isolated direct photons in collisions at is measured with the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC). Because direct photons in particular are produced from the hard scattering and do not interact via the strong force, this measurement is a clean probe of initial-state spin-momentum correlations inside the proton and is in particular sensitive to gluon interference effects within the proton. This is the first time direct photons have been used as a probe of spin-momentum correlations at RHIC. The uncertainties on the results are a 50-fold improvement with respect to those of the one prior measurement for the same observable, from the Fermilab E704 experiment. These results constrain gluon spin-momentum correlations in transversely polarized protons. © 2021 Published by the American Physical Society (Less)
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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Colliding beam accelerators, Heavy ions, Momentum, Photons, Uncertainty analysis, Direct photons, Hadronic collisions, Initial state, Interference effects, Mid-rapidity, Polarized protons, Proton structure, Single-spin asymmetries, Spin-momentum correlation, Uncertainty, Probes
in
Physical Review Letters
volume
127
issue
16
article number
162001
publisher
American Physical Society
external identifiers
  • scopus:85117370715
  • pmid:34723614
ISSN
1079-7114
DOI
10.1103/PhysRevLett.127.162001
language
English
LU publication?
yes
id
31e9fef5-3fad-48a9-911d-6e30e66da2c5
date added to LUP
2021-11-16 09:25:34
date last changed
2025-04-04 14:45:08
@article{31e9fef5-3fad-48a9-911d-6e30e66da2c5,
  abstract     = {{Studying spin-momentum correlations in hadronic collisions offers a glimpse into a three-dimensional picture of proton structure. The transverse single-spin asymmetry for midrapidity isolated direct photons in collisions at is measured with the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC). Because direct photons in particular are produced from the hard scattering and do not interact via the strong force, this measurement is a clean probe of initial-state spin-momentum correlations inside the proton and is in particular sensitive to gluon interference effects within the proton. This is the first time direct photons have been used as a probe of spin-momentum correlations at RHIC. The uncertainties on the results are a 50-fold improvement with respect to those of the one prior measurement for the same observable, from the Fermilab E704 experiment. These results constrain gluon spin-momentum correlations in transversely polarized protons. © 2021 Published by the American Physical Society}},
  author       = {{Acharya, U. A. and Oskarsson, Anders and Silvermyr, David and Zou, L.}},
  issn         = {{1079-7114}},
  keywords     = {{Colliding beam accelerators; Heavy ions; Momentum; Photons; Uncertainty analysis; Direct photons; Hadronic collisions; Initial state; Interference effects; Mid-rapidity; Polarized protons; Proton structure; Single-spin asymmetries; Spin-momentum correlation; Uncertainty; Probes}},
  language     = {{eng}},
  month        = {{10}},
  number       = {{16}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Letters}},
  title        = {{Probing Gluon Spin-Momentum Correlations in Transversely Polarized Protons through Midrapidity Isolated Direct Photons in Collisions at}},
  url          = {{http://dx.doi.org/10.1103/PhysRevLett.127.162001}},
  doi          = {{10.1103/PhysRevLett.127.162001}},
  volume       = {{127}},
  year         = {{2021}},
}