Evidence for light-by-light scattering in ultraperipheral PbPb collisions at root S-NN=5.02 TeV

Please use this identifier to cite or link to this item: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/2118

Title:	Evidence for light-by-light scattering in ultraperipheral PbPb collisions at root S-NN=5.02 TeV
Authors:	CMS Collaboration d'Enterria, David SARKAR, T. CHAUHAN, S. DUBE, SOURABH HEGDE, V. KAPOOR, A. KOTHEKAR, K. PANDEY, S. RANE, A. SHARMA, SEEMA et al. Dept. of Physics
Keywords:	Light-by-light scattering Heavy ions Ultraperipheral collisions CMS LHC TOC-FEB-2019 2019
Issue Date:	Feb-2019
Publisher:	Elsevier B.V.
Citation:	Nuclear Physics A, 982, 791-794.
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.
URI:	http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/2118 https://doi.org/10.1016/j.nuclphysa.2018.10.018
ISSN:	0375-9474 1873-1554
Appears in Collections:	JOURNAL ARTICLES

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