Evidence for light-by-light scattering in ultraperipheral PbPb collisions at √SNN=5.02 TeV

Basit Öğe Kaydı
dc.authoridTorassa, Ezio/0000-0003-2321-0599
dc.authoridHernandez Calama, Jose Maria/0000-0001-6436-7547
dc.authoridLannon, Kevin/0000-0002-9706-0098
dc.authoridKim, Victor/0000-0001-7161-2133
dc.authoridVenditti, Rosamaria/0000-0001-6925-8649
dc.authoridPalla, Fabrizio/0000-0002-6361-438X
dc.authoridCakir, Altan/0000-0002-8627-7689
dc.contributor.authord'Enterria, David
dc.contributor.authorSirunyan, A. M.
dc.contributor.authorTumasyan, A.
dc.contributor.authorAdam, W.
dc.contributor.authorAmbrogi, F.
dc.contributor.authorAsilar, E.
dc.contributor.authorBergauer, T.
dc.date.accessioned2025-03-23T19:39:11Z
dc.date.available2025-03-23T19:39:11Z
dc.date.issued2019
dc.departmentSinop Üniversitesi
dc.description.abstractEvidence for light-by-light (LbL) scattering, gamma gamma -> gamma gamma, in ultraperipheral PbPb collisions at a nucleon-nucleon center of-mass energy of 5.02 TeV is reported. LbL scattering processes are selected in events with just two photons produced, with transverse energy E-T(gamma) > 2 GeV, pseudorapidity vertical bar eta(gamma)vertical bar < 2.4; and diphoton invariant mass m(gamma gamma) > 5 GeV, transverse momentum p(T)(gamma gamma) < 1 GeV, and acoplanarity (1 - Delta phi(gamma gamma)/pi) < 0.01. After all selection criteria, 14 events are observed, compared to 11.1 +/- 1.1 (theo) and 3.8 +/- 1.3 (stat) events expected for signal and background processes respectively. The significance of the signal excess over the background-only hypothesis is 4.10 sigma. The measured fiducial LbL scattering cross section, sigma(fid)(gamma gamma -> gamma gamma) = 122 +/- 46 (stat) +/- 29 (syst) +/- 4 (theo) nb is consistent with the standard model prediction.
dc.description.sponsorshipSTFC [ST/F007434/1, ST/N000242/1, ST/I003622/1, ST/K003542/1, ST/M004775/1, ST/J004871/1, ST/I505580/1, ST/L005603/1, ST/N001273/1] Funding Source: UKRI
dc.identifier.doi10.1016/j.nuclphysa.2018.10.018
dc.identifier.endpage794
dc.identifier.issn0375-9474
dc.identifier.issn1873-1554
dc.identifier.scopusqualityQ2
dc.identifier.startpage791
dc.identifier.urihttps://doi.org/10.1016/j.nuclphysa.2018.10.018
dc.identifier.urihttps://hdl.handle.net/11486/6276
dc.identifier.volume982
dc.identifier.wosWOS:000457515500183
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.language.isoen
dc.publisherElsevier
dc.relation.ispartofNuclear Physics A
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WOS_20250323
dc.subjectLight-by-light scattering
dc.subjectHeavy ions
dc.subjectUltraperipheral collisions
dc.subjectCMS
dc.subjectLHC
dc.titleEvidence for light-by-light scattering in ultraperipheral PbPb collisions at √SNN=5.02 TeV
dc.typeArticle

Dosyalar

Koleksiyon

WoS İndeksli Yayınlar Koleksiyonu