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

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dc.citation.articleNumber051901
dc.citation.issueNumber5
dc.citation.journalTitlePhysical Review Letters
dc.citation.volumeNumber131
dc.contributor.authorCMS Collaboration
dc.date.accessioned2024-05-03T15:51:06Z
dc.date.available2024-05-03T15:51:06Z
dc.date.issued2023
dc.description.abstractThe 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 √sNN=5.02 TeV, corresponding to 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.
dc.identifier.citationCMS Collaboration. (2023). Azimuthal Correlations within Exclusive Dijets with Large Momentum Transfer in Photon-Lead Collisions. Physical Review Letters, 131(5), 051901. https://doi.org/10.1103/PhysRevLett.131.051901
dc.identifier.digitalPhysRevLett-131-051901
dc.identifier.doihttps://doi.org/10.1103/PhysRevLett.131.051901
dc.identifier.urihttps://hdl.handle.net/1911/115529
dc.language.isoeng
dc.publisherAmerican Physical Society
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution (CC BY) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleAzimuthal Correlations within Exclusive Dijets with Large Momentum Transfer in Photon-Lead Collisions
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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