Measurement of light-by-light scattering and the Breit-Wheeler process, and search for axion-like particles in ultraperipheral PbPb collisions at SQUARE ROOTsNN=5.02 TeV
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10511226" target="_blank" >RIV/00216208:11320/25:10511226 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=oeHBtkcEet" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=oeHBtkcEet</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/JHEP08(2025)006" target="_blank" >10.1007/JHEP08(2025)006</a>
Alternative languages
Result language
angličtina
Original language name
Measurement of light-by-light scattering and the Breit-Wheeler process, and search for axion-like particles in ultraperipheral PbPb collisions at SQUARE ROOTsNN=5.02 TeV
Original language description
Measurements of light-by-light scattering (LbL, gamma gamma -> gamma gamma) and the Breit-Wheeler process (BW, gamma gamma -> 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 gamma gamma or e(+)e(-) pair with invariant masses m(gamma gamma,ee) > 5 GeV, along with other fiducial criteria, are selected. The measured BW fiducial production cross section, sigma(fid)(gamma gamma -> e(+)e(-)) = 263.5 +/- 1.8(stat) +/- 17.8(syst) mu b, 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. The measured fiducial LbL scattering cross section, sigma(fid)(gamma gamma -> gamma gamma) = 107 +/- 24(stat) +/- 13(syst) nb, is in agreement with next- to-leading-order predictions. Limits on the production of axion-like particles coupled to photons are set over the mass range 5-100 GeV, including the most stringent limits to date in the range of 5-10 GeV.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10300 - Physical sciences
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of High Energy Physics
ISSN
1029-8479
e-ISSN
1029-8479
Volume of the periodical
neuveden
Issue of the periodical within the volume
08
Country of publishing house
DE - GERMANY
Number of pages
56
Pages from-to
006
UT code for WoS article
001573175200001
EID of the result in the Scopus database
2-s2.0-105024313425