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

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

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.
URI: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/2118
https://doi.org/10.1016/j.nuclphysa.2018.10.018
Date: 2019-02


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.

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