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

A bstract The process pp → p ℓ + 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 s = 13 TeV. One of the two scattered protons is measured in the CMS-TOTEM precision proton s...

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Veröffentlicht in:	JHEP 2018-07, Vol.2018 (7), p.1-45
Hauptverfasser:	Ambrogi, F., Friedl, M., Liko, D., De Bruyn, I., Yonamine, R., Giammanco, A., Magitteri, A., Chinellato, J., Da Silveira, G. G., Fonseca De Souza, S., Avila, C., Cabrera, A., Rykaczewski, H., Finger, M., Heikkilä, J. K., Siikonen, H., Jarry, P., Beaudette, F., Feld, L., Garay Garcia, J., Knolle, J., Hinzmann, A., Reimers, A., Schleper, P., Akbiyik, M., Evangelou, I., Bartók, M., Chauhan, S., Garg, R. B., Naimuddin, M., Marangelli, B., Tuve, C., Barbagli, G., Meschini, M., Piccolo, D., Manzoni, R. A., Moroni, L., Di Guida, S., Iorio, A. O. M., Sciacca, C., Margoni, M., Pozzobon, N., Ronchese, P., Azzurri, P., Borrello, L., Ciocci, M. A., Mandorli, G., Romero, A., Eysermans, J., Gavrilenko, M., Matveev, V., Kodolova, O., Mandrik, P., Delgado Peris, A., Fernández Ramos, J. P., Goy Lopez, S., Auffray, E., Botta, C., Mannelli, M., Rabady, D., Casal, B., Hoss, J., Reichmann, M., Chen, K. F., Agaras, M. N., Kreczko, L., Womersley, W. J., Mastrolorenzo, L., Virdee, T., Bose, T., Hogan, J. M., Gilbert, D., Newman, H. B., Ryd, A., Harris, R. M., Mason, D., Martinez, G., Mermerkaya, H., Eminizer, N., Murray, M., Mohammadi, A., Skhirtladze, N., Siado, J. E., Freer, C., Hortiangtham, A., Mucia, N., Schmitt, M. H., Ji, W., Malik, S., Peng, C. C., Xie, W., Li, W., Saka, H., Riley, G., Celik, A., Tatarinov, A., Joyce, M., Berardi, V., Passaro, V., Procházka, J.
Format:	Artikel
Sprache:	eng
Schlagworte:	Classical and Quantum Gravitation Collisions Design specifications Elementary Particles Forward physics Hadron-Hadron scattering (experiments) High energy physics High Energy Physics - Experiment Kinematics Leptons Luminosity Photon production Physics Physics and Astronomy PHYSICS OF ELEMENTARY PARTICLES AND FIELDS proton-proton scattering Protons Quantum Field Theories Quantum Field Theory Quantum Physics Regular Article - Experimental Physics Relativity Theory String Theory
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Zusammenfassung:	A bstract The process pp → p ℓ + 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 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 μ + μ − 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 γγ collisions at the electroweak scale. This measurement also demonstrates that CT-PPS performs according to the design specifications.
ISSN:	1029-8479 1029-8479
DOI:	10.1007/JHEP07(2018)153