Evidence for light-by-light scattering in ultraperipheral PbPb collisions at root S-NN=5.02 TeV
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
Evidence for light-by-light (LbL) scattering, , 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 , pseudorapidity ; and diphoton invariant mass , transverse momentum , and acoplanarity . After all selection criteria, 14 events are observed, compared to and 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, nb is consistent with the standard model prediction.
Date Issued
2019-02-01
Date Acceptance
2019-01-01
Citation
Nuclear Physics A, 2019, 982, pp.791-794
ISSN
0375-9474
Publisher
Elsevier
Start Page
791
End Page
794
Journal / Book Title
Nuclear Physics A
Volume
982
Copyright Statement
© 2018 The Authors. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000457515500183&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Physics, Nuclear
Physics
Light-by-light scattering
Heavy ions
Ultraperipheral collisions
CMS
LHC
Publication Status
Published
Date Publish Online
2019-01-22