@article{3180763, title = "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", author = "Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Ambrogi, F. and and Asilar, E. and Bergauer, T. and Brandstetter, J. and Brondolin, E. and and Dragicevic, M. and Eroe, J. and Escalante Del Valle, A. and Flechl, M. and and Friedl, M. and Fruehwurth, R. and Ghete, V. M. and Grossmann, J. and and Hrubec, J. and Jeitler, M. and Koenig, A. and Krammer, N. and and Kraetschmer, I and Liko, D. and Madlener, T. and Mikulec, I and Pree, E. and and Rad, N. and Rohringer, H. and Schieck, J. and Schoefbeck, R. and and Spanring, M. and Spitzbart, D. and Taurok, A. and Waltenberger, W. and and Wittmann, J. and Wulz, C-E and Zarucki, M. and Chekhovsky, V and and Mossolov, V and Gonzalez, J. Suarez and De Wolf, E. A. and Di Croce, D. and and Janssen, X. and Lauwers, J. and Pieters, M. and Van de Klundert, M. and and Van Haevermaet, H. and Van Mechelen, P. and Van Remortel, N. and Abu and Zeid, S. and Blekman, F. and D'Hondt, J. and De Bruyn, I and De Clercq, and J. and Deroover, K. and Flouris, G. and Lontkovskyi, D. and Lowette, S. and and Marchesini, I and Moortgat, S. and Moreels, L. and Python, Q. and and Skovpen, K. and Tavernier, S. and Van Doninck, W. and Van Mulders, P. and and Van Parijs, I and Beghin, D. and Bilin, B. and Brun, H. and and Clerbaux, B. and De Lentdecker, G. and Delannoy, H. and Dorney, B. and and Fasanella, G. and Favart, L. and Goldouzian, R. and Grebenyuk, A. and and Kalsi, A. K. and Lenzi, T. and Luetic, J. and Seva, T. and Starling, E. and and Vander Velde, C. and Vanlaer, P. and Vannerom, D. and Yonamine, R. and and Cornelis, T. and Dobur, D. and Fagot, A. and Gul, M. and Khvastunov, and I and Poyraz, D. and Roskas, C. and Trocino, D. and Tytgat, M. and and Verbeke, W. and Vermassen, B. and Vit, M. and Zaganidis, N. and and Bakhshiansohi, H. and Bondu, O. and Brochet, S. and Bruno, G. and and Caputo, C. and Caudron, A. and David, P. and De Visscher, S. and and Delaere, C. and Delcourt, M. and Francois, B. and Giammanco, A. and and Krintiras, G. and Lemaitre, V and Magitteri, A. and Mertens, A. and and Musich, M. and Piotrzkowski, K. and Quertenmont, L. and Saggio, A. and and Marono, M. Vidal and Wertz, S. and Zobec, J. and Alda Junior, W. L. and and Alves, F. L. and Alves, G. A. and Brito, L. and Correia Silva, G. and and Hensel, C. and Moraes, A. and Pol, M. 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G. and Csorg, T. and Deile, M. and De Leonardis, and F. and D'Orazio, A. and Doubek, M. and Druzhkin, D. and Eggert, K. and and Eremin, V and Fiergolski, A. and Garcia, F. and Georgiev, V and Giani, and S. and Grzanka, L. and Hammerbauer, J. and Heino, J. and Isidori, T. and and Ivanchenko, V and Janda, M. and Karev, A. and Kaspar, J. and Kopal, J. and and Kundrat, V and Lami, S. and Lauhakangas, R. and Linhart, R. and and Lindsey, C. and Lokajicek, V, M. and Losurdo, L. and Lo Vetere, M. and and Rodrigueuz, F. Lucas and Macri, M. and Malawski, M. and Minafra, N. and and Minutoli, S. and Naaranoja, T. and Nemes, F. and Niewiadomski, H. and and Novak, T. and Oliveri, E. and Oljemark, F. and Oriunno, M. and and Osterberg, K. and Palazzi, P. and Passaro, V and Peroutka, Z. and and Prochazka, J. and Quinto, M. and Radermacher, E. and Radicioni, E. and and Ravotti, F. and Ruggiero, G. and Saarikko, H. and Scribano, A. and and Sirokyl, J. and Smajek, J. and Snoeys, W. and Stefanovitch, R. and and Sziklai, J. and Taylor, C. and Tcherniaev, E. and Turini, N. and Vacek, and V. and Welti, J. and Williams, J. and Wyszkowski, P. and Zich, J. and and Zielinsk, K. and CMS Collaboration and CMS Collaboration and TOTEM and Collaboration", journal = "Journal of High Energy Physics", year = "2018", number = "7", publisher = "Springer-Verlag", issn = "1126-6708, 1029-8479", doi = "10.1007/JHEP07(2018)153", keywords = "Forward physics; Hadron-Hadron scattering (experiments); Photon production; proton-proton scattering", abstract = "The process pp -> pl(+)l(-)p(()*()), with l(+)l(-) 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 root s = 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(l(+)l(-)) > 110 GeV, and matching forward proton kinematics, are observed, with expected backgrounds of 1.49 +/- 0.07 (stat) +/- 0.53 (syst) and 2.36 +/- 0.09 (stat) +/- 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." }