Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC

doi:10.1038/nphys4208

Utilize este identificador para referenciar este registo: https://hdl.handle.net/1822/48921

Registo completo

Campo DC	Valor	Idioma
dc.contributor.author	Onofre, A.	por
dc.contributor.author	Castro, Nuno Filipe	por
dc.contributor.author	ATLAS Collaboration	por
dc.date.accessioned	2017-12-30T06:34:58Z	-
dc.date.available	2017-12-30T06:34:58Z	-
dc.date.issued	2017	-
dc.identifier.citation	63. Aaboud, M., Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Abeloos, B., . . . Zwalinski, L. (2017). Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC. [Article]. Nature Physics, 13(9), 852-858. doi: 10.1038/nphys4208	por
dc.identifier.issn	1745-2473	-
dc.identifier.uri	https://hdl.handle.net/1822/48921	-
dc.description.abstract	Light-by-light scattering (γγ right arrow γγ) 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 ions. Using 480 μb−1 of lead–lead collision data recorded at a centre-of-mass energy per nucleon pair of 5.02 TeV by the ATLAS detector, here we report evidence for light-by-light scattering. A total of 13 candidate events were observed with an expected background of 2.6 ± 0.7 events. After background subtraction and analysis corrections, the fiducial cross-section of the process Pb + Pb (γγ) right arrow Pb(∗) + Pb(∗)γγ, for photon transverse energy ET > 3 GeV, photon absolute pseudorapidity \|η\| < 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 ± 24 (stat.) ± 17 (syst.) nb, which is in agreement with the standard model predictions.	por
dc.description.sponsorship	We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF and DNSRC, Denmark; IN2P3-CNRS, CEA-DSM/IRFU, France; GNSF, Georgia; BMBF, HGF and MPG, Germany; GSRT, Greece; RGC, Hong Kong SAR, China; ISF, I-CORE and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; RCN, Norway; MNiSW and NCN, Poland; FCT, Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russian Federation; JINR; MESTD, Serbia; MSSR, Slovakia; ARRS and MIZC, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United Kingdom; DOE and NSF, United States of America. In addition, individual groups and members have received support from BCKDF, the Canada Council, CANARIE, CRC, Compute Canada, FQRNT, and the Ontario Innovation Trust, Canada; EPLANET, ERC, ERDF, FP7, Horizon 2020 and Marie Sklodowska-Curie Actions, European Union; Investissements dAvenir Labex and Idex, ANR, Region Auvergne and Fondation Partager le Savoir, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programmes co-financed by EU-ESF and the Greek NSRF; BSF, GIF and Minerva, Israel; BRF, Norway; CERCA Programme Generalitat de Catalunya, Generalitat Valenciana, Spain; the Royal Society and Leverhulme Trust, United Kingdom. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN, the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Ne	por
dc.language.iso	eng	por
dc.publisher	Nature Publishing Group	por
dc.relation	info:eu-repo/grantAgreement/FCT/3599-PPCDT/143069/PT	por
dc.rights	openAccess	por
dc.rights.uri	http://creativecommons.org/licenses/by/4.0/	por
dc.subject	Experimental nuclear physics	por
dc.subject	Experimental particle physics	por
dc.title	Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC	por
dc.type	article	por
dc.peerreviewed	yes	por
oaire.citationStartPage	852	por
oaire.citationEndPage	+	por
oaire.citationIssue	9	por
oaire.citationVolume	13	por
dc.identifier.eissn	1745-2481	-
dc.identifier.doi	10.1038/nphys4208	por
dc.subject.fos	Ciências Naturais::Ciências Físicas	-
dc.description.publicationversion	info:eu-repo/semantics/publishedVersion	por
dc.subject.wos	Science & Technology	por
sdum.journal	Nature Physics	por
Aparece nas coleções:	LIP - Artigos/papers