Publication
Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC
| dc.contributor.author | ATLAS collaboration (2847 authors) | |
| dc.contributor.author | Aguilar-Saavedra, Juan Antonio | |
| dc.contributor.author | Amor Dos Santos, Susana Patricia | |
| dc.contributor.author | Anjos, Nuno | |
| dc.contributor.author | Araque, Juan Pedro | |
| dc.contributor.author | Carvalho, João | |
| dc.contributor.author | Castro, Nuno Filipe | |
| dc.contributor.author | Conde Muiño, Patricia | |
| dc.contributor.author | Da Cunha Sargedas De Sousa, Mario Jose | |
| dc.contributor.author | Fiolhais, Miguel | |
| dc.contributor.author | Galhardo, Bruno | |
| dc.contributor.author | Gomes, Agostinho | |
| dc.contributor.author | Gonçalo, Ricardo | |
| dc.contributor.author | Jorge, Pedro | |
| dc.contributor.author | Machado Miguens, Joana | |
| dc.contributor.author | Maio, Amélia | |
| dc.contributor.author | Maneira, José | |
| dc.contributor.author | Oleiro Seabra, Luis Filipe | |
| dc.contributor.author | Onofre, António | |
| dc.contributor.author | Pedro, Rute | |
| dc.contributor.author | Santos, Helena | |
| dc.contributor.author | Saraiva, João | |
| dc.contributor.author | Silva, José | |
| dc.contributor.author | Tavares Delgado, Ademar | |
| dc.contributor.author | Veloso, Filipe | |
| dc.contributor.author | Wolters, Helmut | |
| dc.date.accessioned | 2019-02-04T12:20:49Z | |
| dc.date.available | 2019-02-04T12:20:49Z | |
| dc.date.issued | 2017-08-14 | |
| dc.date.updated | 2019-02-04T12:20:49Z | |
| dc.description.abstract | Light-by-light scattering ($\gamma\gamma\rightarrow\gamma\gamma$) is a quantum-mechanical process that is forbidden in the classical theory of electrodynamics. This reaction is accessible at the Large Hadron Collider thanks to the large electromagnetic field strengths generated by ultra-relativistic colliding lead (Pb) ions. Using 480 $\mu$b$^{-1}$ of Pb+Pb collision data recorded at a centre-of-mass energy per nucleon pair of 5.02 TeV by the ATLAS detector, the ATLAS Collaboration reports evidence for the $\gamma\gamma\rightarrow\gamma\gamma$ reaction. A total of 13 candidate events are observed with an expected background of 2.6$\pm$0.7 events. After background subtraction and analysis corrections, the fiducial cross section of the process $\textrm{Pb+Pb}\,(\gamma\gamma)\rightarrow \textrm{Pb}^{(\ast)}\textrm{+}\textrm{Pb}^{(\ast)}\,\gamma\gamma$, for photon transverse energy $E_{\mathrm{T}}>$3 GeV, photon absolute pseudorapidity $|\eta|<$2.4, diphoton invariant mass greater than 6 GeV, diphoton transverse momentum lower than 2 GeV and diphoton acoplanarity below 0.01, is measured to be 70 $\pm$ 24 (stat.) $\pm$ 17 (syst.) nb, which is in agreement with Standard Model predictions. | |
| dc.description.version | Peer Reviewed | |
| dc.identifier | Nature Phys. 13 (2017) 852-858; DOI 10.1038/nphys4208 | |
| dc.identifier.uri | http://dx.doi.org/10.1038/nphys4208 | |
| dc.identifier.uri | http://hdl.handle.net/10400.26/27285 | |
| dc.language.iso | eng | |
| dc.relation | Europe-Japan Accelerator Development Exchange Programme | |
| dc.title | Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC | |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.awardTitle | Europe-Japan Accelerator Development Exchange Programme | |
| oaire.awardURI | info:eu-repo/grantAgreement/EC/H2020/645479/EU | |
| oaire.fundingStream | H2020 | |
| project.funder.identifier | http://doi.org/10.13039/501100008530 | |
| project.funder.name | European Commission | |
| rcaap.rights | openAccess | pt |
| rcaap.type | article | |
| relation.isProjectOfPublication | 3086d4e2-341b-464e-92e7-656edf5fb3a7 | |
| relation.isProjectOfPublication.latestForDiscovery | 3086d4e2-341b-464e-92e7-656edf5fb3a7 |