Azimuthal Correlations within Exclusive Dijets with Large Momentum Transfer in Photon-Lead Collisions
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Tarih
2023
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
American Physical Society
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
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 s NN = 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. © 2023 CERN, for the CMS Collaboration.
Açıklama
Anahtar Kelimeler
Colliding beam accelerators, Heavy ions, Momentum, Momentum transfer, Polarization, Rutherford backscattering spectroscopy, Azimuthal correlations, Gluon polarization, Heavy-ion collisions, Higher energy photons, Large momentum transfers, Lead collisions, Measurements of, Spatial geometry, Spatial polarization, Transverse momenta, Photons
Kaynak
Physical Review Letters
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
131
Sayı
5
