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The process pp$\to\ell^+\ell^-$p$^{(*)}$, with $\ell^+\ell^-$ a muon or anelectron pair produced at midrapidity with mass larger than 110 GeV, has beenobserved for the first time at the LHC in pp collisions at $\sqrt{s} =$ 13 TeV.One of the two scattered protons is measured in the CMS-TOTEM precision protonspectrometer (CT-PPS), which operated for the first time in 2016. The secondproton either remains intact or is excited and then dissociates into a low-massstate p$^{*}$, which is undetected. The measurement is based on an integratedluminosity of 9.4 fb$^{-1}$ collected during standard, high-luminosity LHCoperation. A total of 12 $\mu^+\mu^-$ and 8 e$^+$e$^-$ pairs with$m(\ell^{+}\ell^{-}) >$ 110 GeV, and matching forward proton kinematics, areobserved, with expected backgrounds of 1.49 $\pm$ 0.07 (stat) $\pm$ 0.53 (syst)and 2.36 $\pm$ 0.09 (stat) $\pm$ 0.47 (syst), respectively. This corresponds toan excess of more than five standard deviations over the expected background.The present result constitutes the first observation of proton-tagged$\gamma\gamma$ collisions at the electroweak scale. This measurement alsodemonstrates that CT-PPS performs according to the design specifications.

the journal of high energy physics/the journal of high energy physics

Observation of proton-tagged, central (semi)exclusive production of  high-mass lepton pairs in pp collisions at 13 TeV with the CMS-TOTEM  precision proton spectrometer