Nuclear Physics Seminar

"Evidence for light-by-light scattering in 5.02 TeV Pb+Pb collisions with the ATLAS detector at the LHC"

Presented by Mateusz Dyndal, DESY

Tuesday, December 13, 2016, 11:00 am — Small Seminar Room, Bldg. 510

I report evidence for light-by-light scattering, using 480ub^−1 of 5.02 TeV Pb+Pb collision recorded by the ATLAS experiment at the LHC. After background data at subtraction and analysis corrections, the cross section of gamma gamma-> gamma gamma process for photon transverse momentum, E_T > 3 GeV, photon pseudorapidity, |η| < 2.4, diphoton invariant mass greater than 6 GeV, diphoton transverse momentum lower than 2 GeV and diphoton aco- planarity below 0.01, has been measured to be 70 ± 20 (stat.) ± 17 (syst.) nb, which is in agreement with the SM prediction of 49 ± 10 nb.

Hosted by: Peter Steinberg

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