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  4. Azimuthal Correlations within Exclusive Dijets with Large Momentum Transfer in Photon-Lead Collisions
 
research article

Azimuthal Correlations within Exclusive Dijets with Large Momentum Transfer in Photon-Lead Collisions

Tumasyan, A.
•
Adam, W.
•
Bergauer, T.
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August 1, 2023
Physical Review Letters

The structure of nucleons is multidimensional and depends on the transverse momenta, spatial geometry, and polarization of the constituent partons. Such a structure can be studied using high-energy photons produced in ultraperipheral heavy-ion collisions. The first measurement of the azimuthal angular correlations of exclusively produced events with two jets in photon-lead interactions at large momentum transfer is presented, a process that is considered to be sensitive to the underlying nuclear gluon polarization. This study uses a data sample of ultraperipheral lead-lead collisions at ffiffiffiffiffiffiffi p = 5.02 TeV, corresponding to sNN an integrated luminosity of 0.38 nb-1, collected with the CMS experiment at the LHC. The measured second harmonic of the correlation between the sum and difference of the two jet transverse momentum vectors is found to be positive, and rising, as the dijet transverse momentum increases. A well-tuned model that has been successful at describing a wide range of proton scattering data from the HERA experiments fails to describe the observed correlations, suggesting the presence of gluon polarization effects.

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Type
research article
DOI
10.1103/PhysRevLett.131.051901
Web of Science ID

WOS:001102975600004

Author(s)
Tumasyan, A.
Adam, W.
Bergauer, T.
Dragicevic, M.
Del Valle, A. Escalante
Fruhwirth, R.
Jeitler, M.
Krammer, N.
Lechner, L.
Liko, D.
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Corporate authors
CMS Collaboration
Date Issued

2023-08-01

Publisher

Amer Physical Soc

Published in
Physical Review Letters
Volume

131

Issue

5

Article Number

051901

Subjects

Physical Sciences

•

Deep-Inelastic Scattering

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPHE  
FunderGrant Number

BMBWF (Austria)

FWF (Austria)

FNRS (Belgium)

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Available on Infoscience
March 18, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/206273
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