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https://hdl.handle.net/11147/7726
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 | Authors: | CMS Collaboration Karapınar, Güler |
Keywords: | Forward physics Photon production Central exclusive CMS-TOTEM CT-PPS |
Publisher: | Springer Verlag | Source: | Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., Brandstetter, J. ...CMS Collaboration (2018). 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. Journal of High Energy Physics, 2018(7). doi:10.1007/JHEP07(2018)153 | 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 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. | URI: | https://doi.org/10.1007/JHEP07(2018)153 https://hdl.handle.net/11147/7726 |
ISSN: | 1029-8479 1029-8479 |
Appears in Collections: | Mathematics / Matematik Rectorate / Rektörlük Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection |
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Sirunyan2018_Proton.pdf | Makale (Article) | 3.51 MB | Adobe PDF | ![]() View/Open |
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