Szczegóły publikacji
Opis bibliograficzny
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. M. Sirunyan [et al.], V. AVATI [et al.], L. GRZANKA [et al.], M. MALAWSKI [et al.], P. WYSZKOWSKI [et al.], K. ZIELIŃSKI // The Journal of High Energy Physics [Dokument elektroniczny]. — Czasopismo elektroniczne ; ISSN 1029-8479. — 2018 — iss. 7 art. no. 153, s. 1–44. — Bibliogr. s. 22–24, Abstr. — Publikacja dostępna online od: 2018-07-24. — V. Avati - zatrudnienie w ramach grantu, dod. afiliacja: CERN, Geneva, Switzerland. — L. Grzanka, M. Malawski - dod. afiliacja: Institute of Nuclear Physics, Polish Academy of Sciences, Krakow
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Dane bibliometryczne
| ID BaDAP | 116680 |
|---|---|
| Data dodania do BaDAP | 2018-09-27 |
| Tekst źródłowy | URL |
| DOI | 10.1007/JHEP07(2018)153 |
| Rok publikacji | 2018 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | The Journal of High Energy Physics |
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.