Fitting ATLAS and CMS dilepton data within a dipole form factor model yields an effective proton radius of 1.002 ± 0.038 fm, showing sensitivity to the radius but not resolving the puzzle.
Measurement of the exclusive $\gamma \gamma \rightarrow \mu^+ \mu^-$ process in proton--proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
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abstract
The production of exclusive $\gamma \gamma \rightarrow \mu^+ \mu^-$ events in proton--proton collisions at a centre-of-mass energy of 13 TeV is measured with the ATLAS detector at the LHC, using data corresponding to an integrated luminosity of 3.2 fb$^{-1}$. The measurement is performed for a dimuon invariant mass of 12 GeV $<m_{\mu^+\mu^-}<$ 70 GeV. The integrated cross-section is determined within a fiducial acceptance region of the ATLAS detector and differential cross-sections are measured as a function of the dimuon invariant mass. The results are compared to theoretical predictions that include corrections for absorptive effects.
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Sensitivity of the photon-induced processes to the proton radius
Fitting ATLAS and CMS dilepton data within a dipole form factor model yields an effective proton radius of 1.002 ± 0.038 fm, showing sensitivity to the radius but not resolving the puzzle.