Browsing by Subject "CP CONSERVATION"

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  • The CMS collaboration; Sirunyan, A. M.; Eerola, Paula; Forthomme, Laurent; Kirschenmann, Henning; Österberg, Kenneth; Voutilainen, Mikko; Havukainen, Joona; Heikkilä, Jaana; Järvinen, Terhi; Karimäki, Veikko; Kinnunen, Ritva; Lampén, Tapio; Lassila-Perini, Katri (Kati); Laurila, Santeri; Lehti, Sami; Linden, Tomas; Luukka, Panja; Mäenpää, T; Siikonen, Hannu; Tuominen, Eija; Tuominiemi, Jorma; Tuuva, Tuure (2019)
    A search for the production of events containing three W bosons predicted by the standard model is reported. The search is based on a data sample of proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the CMS experiment at the CERN LHC and corresponding to a total integrated luminosity of 35.9 fb$^{-1}$. The search is performed in final states with three leptons (electrons or muons), or with two same-charge leptons plus two jets. The observed (expected) significance of the signal for W$^\pm$W$^\pm$W$^\mp$ production is 0.60 (1.78) standard deviations, and the ratio of the measured signal yield to that expected from the standard model is 0.34 $^{+0.62}_{-0.34}$. Limits are placed on three anomalous quartic gauge couplings and on the production of massive axionlike particles.