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Measurement of light-by-light scattering and the Breit-Wheeler process, and search for axion-like particles in ultraperipheral PbPb collisions at $\sqrt{{s}_{\text{NN}}}$ = 5.02 TeV

CMS Collaboration; Hayrapetyan, A.; Tumasyan, A.; Adam, W.; Andrejkovic, J. W.; Bergauer, T.; Chatterjee, S.; Damanakis, K.; Dragicevic, M.; Hussain, P. S.; Jeitler, M.; Krammer, N.; Li, A.; Liko, D.; Mikulec, I.; Schieck, J.; Schöfbeck, R.; Schwarz, D.; Sonawane, M.; ... mehr

Abstract (englisch):

Measurements of light-by-light scattering (LbL, γγ → γγ) and the Breit-Wheeler process (BW, γγ → e$^+$e$^−$) are reported in ultraperipheral PbPb collisions at a centre-of- mass energy per nucleon pair of 5.02 TeV. The data sample, corresponding to an integrated luminosity of 1.7 nb$^{−1}$, was collected by the CMS experiment at the CERN LHC in 2018. Events with an exclusively produced γγ or e$^+$e$^−$ pair with invariant masses m$^{γγ,ee}$ > 5 GeV, along with other fiducial criteria, are selected. The measured BW fiducial production cross section, σ$_{fid}$(γγ → e$^+$e$^−$) = 263.5 ± 1.8(stat) ± 17.8(syst) μb, as well as the differential distributions for various kinematic observables, are in agreement with leading-order quantum electrodynamics predictions complemented with final-state photon radiation. The measured differential BW cross sections allow discrimination between different theoretical descriptions of the photon flux of the lead ion. In the LbL final state, 26 exclusive diphoton candidate events are observed compared with 12.0 ± 2.9 expected for the background. Combined with previous results, the observed significance of the LbL signal with respect to the background- only hypothesis is above five standard deviations. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000188386
Veröffentlicht am 11.12.2025
Originalveröffentlichung
DOI: 10.1007/JHEP08(2025)006
Scopus
Zitationen: 2
Web of Science
Zitationen: 1
Dimensions
Zitationen: 6
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Astroteilchenphysik (IAP)
Institut für Experimentelle Teilchenphysik (ETP)
Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Scientific Computing Center (SCC)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2025
Sprache Englisch
Identifikator ISSN: 1029-8479
KITopen-ID: 1000188386
HGF-Programm 51.11.01 (POF IV, LK 01) Teilchenphysik
Erschienen in Journal of High Energy Physics
Verlag Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Band 2025
Heft 8
Seiten 6
Vorab online veröffentlicht am 01.08.2025
Schlagwörter Hadron-Hadron Scattering, Photon Production, Relativistic Heavy Ion Physics
Nachgewiesen in Scopus
OpenAlex
Dimensions
Web of Science
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