Evidence for light-by-light scattering in ultraperipheral PbPb collisions at √sNN = 5.02 TeV
dc.contributor.author | d'Enterria, D. | |
dc.contributor.author | Sirunyan, A. M. | |
dc.contributor.author | Işıldak, Bora | |
dc.date.accessioned | 2020-08-20T12:49:33Z | |
dc.date.available | 2020-08-20T12:49:33Z | |
dc.date.issued | 2019-02 | |
dc.identifier.issn | 0375-9474 | en_US |
dc.identifier.uri | http://hdl.handle.net/10679/6796 | |
dc.identifier.uri | https://www.sciencedirect.com/science/article/pii/S0375947418302914 | |
dc.description.abstract | Evidence 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. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | Elsevier | en_US |
dc.relation.ispartof | Nuclear Physics A | |
dc.rights | openAccess | |
dc.title | Evidence for light-by-light scattering in ultraperipheral PbPb collisions at √sNN = 5.02 TeV | en_US |
dc.type | Article | en_US |
dc.description.version | Publisher version | en_US |
dc.peerreviewed | yes | en_US |
dc.publicationstatus | Published | en_US |
dc.contributor.department | Özyeğin University | |
dc.contributor.authorID | (ORCID 0000-0002-0283-5234 & YÖK ID 124605) Işıldak, Bora | |
dc.contributor.ozuauthor | Işıldak, Bora | |
dc.creator | The CMS Collaboration | |
dc.identifier.volume | 982 | en_US |
dc.identifier.startpage | 791 | en_US |
dc.identifier.endpage | 794 | en_US |
dc.identifier.wos | WOS:000457515500183 | |
dc.identifier.doi | 10.1016/j.nuclphysa.2018.10.018 | en_US |
dc.subject.keywords | Light-by-light scattering | en_US |
dc.subject.keywords | Heavy ions | en_US |
dc.subject.keywords | Ultraperipheral collisions | en_US |
dc.subject.keywords | CMS | en_US |
dc.subject.keywords | LHC | en_US |
dc.identifier.scopus | SCOPUS:2-s2.0-85060158155 | |
dc.contributor.authorMale | 1 | |
dc.relation.publicationcategory | Article - International Refereed Journal - Institution Academic Staff |
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