Evidence for light-by-light scattering in ultraperipheral PbPb collisions at root S-NN=5.02 TeV
dc.contributor.author
D’Enterria, David
dc.date.accessioned
2019-03-19T11:26:24Z
dc.date.available
2019-03-02T04:11:25Z
dc.date.available
2019-03-19T11:20:41Z
dc.date.available
2019-03-19T11:26:24Z
dc.date.issued
2019-02
dc.identifier.issn
0375-9474
dc.identifier.issn
1873-1554
dc.identifier.other
10.1016/j.nuclphysa.2018.10.018
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/328673
dc.identifier.doi
10.3929/ethz-b-000328673
dc.description.abstract
Evidence for light-by-light (LbL) scattering, γγ→γγ, 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 EγT>2GeV, pseudorapidity |ηγ|<2.4; and diphoton invariant mass mγγ>5 GeV, transverse momentum pγγT<1 GeV, and acoplanarity (1−Δφγγ/π)<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 4.1σ. The measured fiducial LbL scattering cross section, σfid(γγ→γγ)=122±46 (stat)±29 (syst)±4 (theo) nb is consistent with the standard model prediction.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Elsevier
en_US
dc.rights.uri
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject
Light-by-light scattering
en_US
dc.subject
Heavy ions
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
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
dc.date.published
2019-01-22
ethz.journal.title
Nuclear Physics A
ethz.journal.volume
982
en_US
ethz.journal.abbreviated
Nucl. phys., A
ethz.pages.start
791
en_US
ethz.pages.end
794
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.notes
Author on behalf of the CMS Collaboration
en_US
ethz.identifier.wos
ethz.publication.place
Amsterdam
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2019-03-02T04:11:26Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2019-03-19T11:21:13Z
ethz.rosetta.lastUpdated
2020-02-15T17:54:44Z
ethz.rosetta.versionExported
true
ethz.COinS
ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.atitle=Evidence%20for%20light-by-light%20scattering%20in%20ultraperipheral%20PbPb%20collisions%20at%20root%20S-NN=5.02%20TeV&rft.jtitle=Nuclear%20Physics%20A&rft.date=2019-02&rft.volume=982&rft.spage=791&rft.epage=794&rft.issn=0375-9474&1873-1554&rft.au=D%E2%80%99Enterria,%20David&rft.genre=article&rft_id=info:doi/10.1016/j.nuclphysa.2018.10.018&
Dateien zu diesem Eintrag
Publikationstyp
-
Journal Article [130586]