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The production of a pair of leptons via photon-photon fusion, , is observed for the first time in proton-proton collisions, with a significance of 5. 3 standard deviations. This observation is based on a data set recorded with the CMS detector at the LHC at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 138 fb^-1. Events with a pair of leptons produced via photon-photon fusion are selected by requiring them to be back-to-back in the azimuthal direction and to have a minimum number of charged hadrons associated with their production vertex. The leptons are reconstructed in their leptonic and hadronic decay modes. The measured fiducial cross section of is ᶠidₒbs = 12. 4 ^+3. 8-₃. ₁ fb. Constraints are set on the contributions to the anomalous magnetic moment (a_) and electric dipole moments (d_) of the lepton originating from potential effects of new physics on the vertex: a_ = 0. 0009 -₀. ₀₀₃₁^+0. 0032 and d_ 2. 9 10^-17 e\, cm (95% confidence level), consistent with the standard model.
CMS Collaboration (Thu,) studied this question.
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