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Title: | Azimuthal Correlations within Exclusive Dijets with Large Momentum Transfer in Photon-Lead Collisions |
Authors: | Tumasyan, A Adam, W Bergauer, T Dragicevic, M Del Valle, AE Frühwirth, R Jeitler, M Krammer, N Lechner, L Liko, D Mikulec, I Alves, GA Hensel, C Moraes, A Júnior, WLA Das Chagas, EBB Malbouisson, HB Khan, A Carvalho, W Hobson, PR Pitters, FM Rad, N Schieck, J Schöfbeck, R Spanring, M Templ, S Waltenberger, W Wulz, CE Zarucki, M Darwish, MR De Wolf, EA Di Croce, D Janssen, T Kello, T Lelek, A Pieters, M Sfar, HR Van Haevermaet, H Van Mechelen, P Van Putte, S Van Remortel, N Blekman, F Bols, ES Chhibra, SS D’Hondt, J De Clercq, J Lontkovskyi, D Lowette, S Marchesini, I Moortgat, S Morton, A Müller, D Python, Q Tavernier, S Van Doninck, W Van Mulders, P Beghin, D Bilin, B Clerbaux, B De Lentdecker, G Dorney, B Favart, L Grebenyuk, A Kalsi, AK Makarenko, I Moureaux, L Pétré, L Popov, A Postiau, N Starling, E Thomas, L Vander Velde, C Vanlaer, P Vannerom, D Wezenbeek, L Cornelis, T Dobur, D Gruchala, M Khvastunov, I Niedziela, M Roskas, C Zahid, S Skovpen, K Tytgat, M Verbeke, W Vermassen, B Vit, M Bruno, G Teodorescu, L Bury, F Caputo, C David, P Delaere, C Delcourt, M Reid, ID Donertas, IS Giammanco, A Lemaitre, V Mondal, K Mackay, CK Prisciandaro, J Taliercio, A Teklishyn, M Kyberd, P Vischia, P Wertz, S Cole, JE Wuyckens, S |
Keywords: | quark and gluon jets;relativistic heavy-ion collisions;nuclear physics;particles and fields;strong interaction;particle phenomena;particle production |
Issue Date: | 1-Aug-2023 |
Publisher: | American Physical Society |
Citation: | Tumasyan, A. et al. for the benefit of the CMS Collaboration (2023) 'Azimuthal Correlations within Exclusive Dijets with Large Momentum Transfer in Photon-Lead Collisions', Physical Review Letters, 131 (5), 051901, pp.1 - 18. doi: 10.1103/PhysRevLett.131.051901. |
Abstract: | 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. |
URI: | https://bura.brunel.ac.uk/handle/2438/28392 |
DOI: | https://doi.org/10.1103/PhysRevLett.131.051901 |
ISSN: | 0031-9007 |
Other Identifiers: | ORCiD: A. Tumasyan https://orcid.org/0009-0000-0684-6742 ORCiD: J.E. Cole https://orcid.org/0000-0001-5638-7599 ORCiD: P.R. Hobson https://orcid.org/0000-0002-5645-5253 ORCiD: A. Khan https://orcid.org/0000-0002-4597-4402 ORCiD: P. Kyberd https://orcid.org/0000-0002-7353-7090 ORCiD: C.K. Mackay https://orcid.org/0000-0003-4252-6740 ORCiD: I.D. Reid https://orcid.org/0000-0002-9235-779X ORCiD: L. Teodorescu https://orcid.org/0000-0002-6974-6201 ORCiD: S. Zahid https://orcid.org/0000-0003-2123-3607 051901 |
Appears in Collections: | Dept of Electronic and Electrical Engineering Research Papers |
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