Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/6704
Title: Search for standard model production of four top quarks in proton–proton collisions at s=13 TeV
Authors: CMS Collaboration
Karapınar, Güler
Keywords: Large Hadron Collider (LHC)
Compact Muon Solenoid
Issue Date: Sep-2017
Publisher: Elsevier Ltd.
Source: Sirunyan, A.M., Tumasyan, A., Adam, W., Asilar, E., Bergauer,T., Brandstetter, J.,...CMS Collaboration (2017). Search for standard model production of four top quarks in proton–proton collisions at √s=13 TeV. Physics Letters, Section B, 772, 336-358. doi:10.1016/j.physletb.2017.06.064
Abstract: A search for events containing four top quarks (tt¯tt¯) is reported from proton–proton collisions recorded by the CMS experiment at s=13 TeV and corresponding to an integrated luminosity of 2.6 fb−1. The analysis considers the single-lepton (e or μ)+jets and the opposite-sign dilepton (μ+μ−, μ±e∓, or e+e−)+jets channels. It uses boosted decision trees to combine information on the global event and jet properties to distinguish between tt¯tt¯ and tt¯ production. The number of events observed after all selection requirements is consistent with expectations from background and standard model signal predictions, and an upper limit is set on the cross section for tt¯tt¯ production in the standard model of 94 fb at 95% confidence level (10.2 × the prediction), with an expected limit of 118 fb. This is combined with the results from the published CMS search in the same-sign dilepton channel, resulting in an improved limit of 69 fb at 95% confidence level (7.4 × the prediction), with an expected limit of 71 fb. These are the strongest constraints on the rate of tt¯tt¯ production to date.
URI: http://doi.org/10.1016/j.physletb.2017.06.064
http://hdl.handle.net/11147/6704
ISSN: 0370-2693
Appears in Collections:Mathematics / Matematik
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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