| dc.contributor.author | d'Enterria, David | |
| dc.contributor.author | Sirunyan, A. M. | |
| dc.contributor.author | Tumasyan, A. | |
| dc.contributor.author | Adam, W. | |
| dc.contributor.author | Ambrogi, F. | |
| dc.contributor.author | Asilar, E. | |
| dc.contributor.author | Özdemir, Kadri | |
| dc.contributor.author | CMS Collaboration | |
| dc.date.accessioned | 2021-06-05T19:57:27Z | |
| dc.date.available | 2021-06-05T19:57:27Z | |
| dc.date.issued | 2019 | |
| dc.identifier.issn | 0375-9474 | |
| dc.identifier.issn | 1873-1554 | |
| dc.identifier.uri | https://doi.org/10.1016/j.nuclphysa.2018.10.018 | |
| dc.identifier.uri | https://hdl.handle.net/20.500.12960/500 | |
| dc.description | WOS:000457515500183 | en_US |
| 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 | en_US |
| dc.rights | info:eu-repo/semantics/openAccess | en_US |
| dc.subject | Light-By-Light Scattering | en_US |
| dc.subject | Heavy İons | en_US |
| dc.subject | Ultraperipheral Collisions | en_US |
| dc.subject | CMS | en_US |
| dc.subject | Lhc | en_US |
| dc.title | Evidence for light-by-light scattering in ultraperipheral PbPb collisions at root S-NN=5.02 TeV | en_US |
| dc.type | article | en_US |
| dc.authorid | 0000-0002-0103-1488 | |
| dc.department | Mühendislik Fakültesi, Elektrik-Elektronik Mühendisliği Bölümü | en_US |
| dc.contributor.institutionauthor | Özdemir, Kadri | |
| dc.identifier.doi | 10.1016/j.nuclphysa.2018.10.018 | |
| dc.identifier.volume | 982 | en_US |
| dc.identifier.startpage | 791 | en_US |
| dc.identifier.endpage | 794 | en_US |
| dc.relation.publicationcategory | Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı | en_US |
