Abstract

The process pp$ o\ell^+\ell^-$p$^(*)$, with $\ell^+\ell^-$ a muon or an electron pair produced at midrapidity with mass larger than 110 GeV, has been observed for the first time at the LHC in pp collisions at $\sqrts =$ 13 TeV. One of the two scattered protons is measured in the CMS-TOTEM precision proton spectrometer (CT-PPS), which operated for the first time in 2016. The second proton either remains intact or is excited and then dissociates into a low-mass state p$^*$, which is undetected. The measurement is based on an integrated luminosity of 9.4 fb$^-1$ collected during standard, high-luminosity LHC operation. A total of 12 $\mu^+\mu^-$ and 8 e$^+$e$^-$ pairs with $m(\ell^+\ell^-) >$ 110 GeV, and matching forward proton kinematics, are observed, 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 to an 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 also demonstrates that CT-PPS performs according to the design specifications.

Autore Pugliese

• Pompili Alexis , Selvaggi Giovanna , De Palma Mauro , My Salvatore , Nuzzo Salvatore Vitale

Tutti gli autori

• DI FLORIO A.;POMPILI A.;GELMI A.;CALABRIA C.;MINIELLO G.;SELVAGGI G.;CRISTELLA L.;DE PALMA M.;RADOGNA R.;VENDITTI R.;MY S.;NUZZO S.V.;LEZKI S.

Titolo volume/Rivista

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Anno di pubblicazione

2018

ISSN

1126-6708

ISBN

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