Measurement of light-by-light scattering and the Breit-Wheeler process, and search for axion-like particles in ultraperipheral PbPb collisions at $$\sqrt{s_\mathrm{NN}}$$ = 5.02 TeV
- Yerevan Phys. Inst.
- Vienna, OAW
- Vienna, OAW; TU Vienna
- Antwerp U.
- Vrije U., Brussels
- Vrije U., Brussels; Gent U.
- Brussels U.
- Gent U.
- Louvain U.
- Rio de Janeiro, CBPF
- Rio de Janeiro, CBPF; Rio de Janeiro State U.
- Rio de Janeiro State U.
- Rio de Janeiro State U.; U. Campinas
- Rio de Janeiro State U.; Rio Grande do Sul U.
- Rio Grande do Sul U.
- Sofiya, Inst. Nucl. Res.
- Sofiya U.
- Tarapaca U.
- Beihang U.
- Tsinghua U., Beijing
- Tsinghua U., Beijing; Nanjing Normal U.; Iowa U.
- Beijing, Inst. High Energy Phys.; UCAS, Beijing
- Beijing, Inst. High Energy Phys.
- Peking U.
- South China Normal U.
- SYSU, Guangzhou
- Nanjing Normal U.
- Fudan U.; Brussels U.
- Fudan U.
- Zhejiang U.
- Andes U., Bogota
- Antioquia U.
- Split Tech. U.
- Split U.
- Boskovic Inst., Zagreb
- Boskovic Inst., Zagreb; Unlisted
- Cyprus U.
- Charles U.
- Quito, Escuela Politecnica Natl.
- San Francisco de Quito U.
- Cairo, Acad. Sci. Res. Tech.; Suez Canal U.; British U. in Egypt
- Cairo, Acad. Sci. Res. Tech.
- Cairo, Acad. Sci. Res. Tech.; British U. in Egypt
- Fayoum U.
- NICPB, Tallinn
- Helsinki U.
- Helsinki Inst. of Phys.
- Lappeenranta U. Tech.
- IRFU, Saclay
- IRFU, Saclay; Purdue U.
- Ecole Polytechnique
- Strasbourg, IPHC; Haute Alsace U.
- Strasbourg, IPHC
- CC, Villeurbanne
- IP2I, Lyon
- IP2I, Lyon; Istinye U., Istanbul
- GTU, Tbilisi
- GTU, Tbilisi; Unlisted
- Aachen, Tech. Hochsch.
- DESY
- DESY; Hamburg U.
- DESY; Aachen, Tech. Hochsch.
- DESY; Brandenburg Tech. U.
- DESY; IAS, Julich; Aachen, Tech. Hochsch.
- Hamburg U.
- KIT, Karlsruhe, EKP
- KIT, Karlsruhe, EKP; CERN
- Democritos Nucl. Res. Ctr.
- Democritos Nucl. Res. Ctr.; CERN
- Athens U.
- Natl. Tech. U., Athens
- Ioannina U.
- Budapest, RMKI
- Budapest, RMKI; Debrecen, Inst. Nucl. Res.
- Budapest, RMKI; Eotvos U.
- Eotvos U.
- Eotvos U.; Budapest, RMKI
- U. Debrecen, Inst. Phys.
- Debrecen, Inst. Nucl. Res.
- EKU KRC, Gyongyos; Budapest, RMKI
- EKU KRC, Gyongyos
- Panjab U.
- Delhi U.
- Saha Inst.
- Saha Inst.; Visva Bharati U.
- Indian Inst. Tech., Madras
- Indian Inst. Tech., Madras; Bangalore, Indian Inst. Sci.
- TIFR, Mumbai, DHEP
- Bhubaneswar, NISER; Indian Inst. Tech., Bhubaneswar
- Bhubaneswar, NISER
- Bhubaneswar, NISER; Bhubaneswar, Inst. Phys.
- IISER, Pune
- Isfahan Tech. U.; DESY
- Isfahan Tech. U.
- Isfahan Tech. U.; Sharif U. of Tech.
- IPM, Tehran
- IPM, Tehran; USTM, Behshahr
- IPM, Tehran; Isfahan Tech. U.
- University Coll., Dublin
- INFN, Bari
- Bari U.
- INFN, Bari; Helwan U.
- INFN, Bologna
- INFN, Catania
- INFN, Florence
- Frascati
- Frascati; Guglielmo Marconi U.
- INFN, Genoa
- INFN, Milan Bicocca
- INFN, Naples
- Naples U.
- CERN
- Fermilab
- INFN, Legnaro
- INFN, Padua
- INFN, Pavia
- INFN, Perugia
- Pisa U.
- INFN, Pisa
- Pisa, Scuola Normale Superiore
- INFN, Rome
- INFN, Turin
- Turin U.
- INFN, Trieste
- CHEP, Taegu
- Gangneung-Wonju Natl. U.
- Chonnam Natl. U.
- Hanyang U.
- Hanyang U.; IP2I, Lyon
- Korea U.
- Kyung Hee U.
- Sejong U.
- Seoul Natl. U.
- Seoul U.
- Yonsei U.
- Sungkyunkwan U.
- AUM, Kuwait
- Riga Tech. U.
- Vilnius U.
- Malaya U.
- Sonora U.
- CINVESTAV, IPN
- CINVESTAV, IPN; Conacyt, Mexico
- Iberoamericana U.
- Puebla U., Inst. Fis.
- Montenegro U.
- Canterbury U.
- Quaid-i-Azam U.
- AGH-UST, Cracow
- NCBJ, Swierk
- Warsaw U.
- Warsaw U. of Tech.
- LIP, Lisbon
- Belgrade U.
- VINCA Inst. Nucl. Sci., Belgrade
- Madrid, CIEMAT
- Madrid, Autonoma U.
- Oviedo U.
- Cantabria Inst. of Phys.
- Colombo U.
- Ruhuna U.
- CERN; Brandenburg Tech. U.
- CERN; Athens U.
- PSI, Villigen; Zurich U.
- PSI, Villigen
- Zurich, ETH
- Zurich U.; Stefan Meyer Inst. Subatomare Phys.
- Zurich U.
- Taiwan, Natl. Central U.; Annecy, LAPP
- Taiwan, Natl. Central U.
- Taiwan, Natl. Central U.; Bangalore, Indian Inst. Sci.
- Taiwan, Natl. Taiwan U.
- Chulalongkorn U.
- Cukurova U.
- Cukurova U.; Adiyaman U.
- Middle East Tech. U., Ankara
- Bogazici U.
- Bogazici U.; Marmara U.
- Bogazici U.; Kafkas U.
- Istanbul Tech. U.
- Istanbul Tech. U.; Hacettepe U.
- Istanbul U.; Erzincan U.
- Istanbul U.
- Yildiz Tech. U.
- Inst. Scintill. Mat., Kharkiv
- Kharkov, KIPT
- Bristol U.
- Bristol U.; Vrije U., Brussels
- Rutherford
- Rutherford; Southampton U.
- Imperial Coll., London
- Imperial Coll., London; Monash U.
- Imperial Coll., London; CERN
- Brunel U.
- Baylor U.
- Catholic U. America
- Alabama U.
- Boston U.
- Brown U.
- Brown U.; Bethel Coll.
- Brown U.; Karamanoglu Mehmetbey U., Karaman
- UC, Davis
- UCLA
- UC, Riverside
- UC, San Diego
- UC, Santa Barbara
- Caltech
- Carnegie Mellon U.
- Colorado U.
- Cornell U.
- Fermilab; Caltech
- Fermilab; Naval Academy, Annapolis
- Florida U.
- Florida State U.
- Florida Inst. Tech.
- Florida Inst. Tech.; Ain Shams U., Cairo
- Illinois U., Chicago
- Iowa U.
- Iowa U.; Bingöl U.
- Iowa U.; GTU, Tbilisi
- Iowa U.; Sinop U.
- Johns Hopkins U.
- Kansas U.
- Kansas U.; Bucharest, IFIN-HH
- Kansas State U.
- Maryland U.
- Maryland U.; Unlisted
- MIT
- Minnesota U.
- Nebraska U.
- SUNY, Buffalo
- Northeastern U.
- Northwestern U.
- Notre Dame U.
- Notre Dame U.; Unlisted
- Ohio State U.
- Princeton U.
- Puerto Rico U., Mayaguez
- Purdue U.
- Purdue U., Calumet
- Rice U.
- Rochester U.
- Rochester U.; Unlisted
- Rutgers U., Piscataway
- Tennessee U.
- Texas A-M
- Texas A-M; Texas A&M U. Qatar, Doha
- Texas A-M; CHEP, Taegu
- Texas Tech.
- Vanderbilt U.
- Virginia U.
- Wayne State U.
- Wisconsin U., Madison
- Unlisted
- Unlisted; Tashkent, IYF
- Unlisted; Northeastern U.
- Unlisted; Imperial Coll., London; Yerevan Phys. Inst.
- Unlisted; Yerevan Phys. Inst.
Measurements of light-by-light scattering (LbL, $$\gamma\gamma\to\gamma\gamma$$) and the Breit--Wheeler process (BW, $$\gamma\gamma$$$$\to$$$$\mathrm{e^+e^-}$$) 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 $$\mathrm{e^+e^-}$$ pair with invariant masses $$m^{\gamma\gamma,\mathrm{ee}}$$$$>$ 5 GeV, along with other fiducial criteria, are selected. The measured BW fiducial production cross section, $$\sigma_\text{fid}$$($$\gamma\gamma$$$$\to$$$$\mathrm{e^+e^-}$$) = 263.5 $$\pm$$ 1.8 (stat) $$\pm$$ 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 discriminating 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 $$\pm$$ 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, $$\sigma_\text{fid} (\gamma\gamma\to\gamma\gamma)$$ = 107 $$\pm$$ 24 (stat) $$\pm$$ 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.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- CMS
- DOE Contract Number:
- 89243024CSC000002
- OSTI ID:
- 2497818
- Report Number(s):
- CMS-HIN-21-015; CERN-EP-2024-284; FERMILAB-PUB-24-0962-CMS; arXiv:2412.15413; oai:inspirehep.net:2861858
- Journal Information:
- TBD, Journal Name: TBD
- Country of Publication:
- United States
- Language:
- English