Browsing by Author "Brandstetter J"

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    Search for new phenomena in final states with two opposite-charge, same-flavor leptons, jets, and missing transverse momentum in pp collisions at √s=13 TeV
    (Springer Nature, 2018-03-13) Sirunyan AM; Tumasyan A; Adam W; Ambrogi F; Asilar E; Bergauer T; Brandstetter J; Brondolin E; Dragicevic M; Erö J; Flechl M; Friedl M; Frühwirth R; Ghete VM; Grossmann J; Hrubec J; Jeitler M; König A; Krammer N; Krätschmer I; Liko D; Madlener T; Mikulec I; Pree E; Rabady D; Rad N; Rohringer H; Schieck J; Schöfbeck R; Spanring M; Spitzbart D; Waltenberger W; Wittmann J; Wulz CE; Zarucki M; Chekhovsky V; Mossolov V; Suarez Gonzalez J; De Wolf EA; Di Croce D; Janssen X; Lauwers J; Van De Klundert M; Van Haevermaet H; Van Mechelen P; Van Remortel N; Abu Zeid S; Blekman F; D’Hondt J; De Bruyn I; De Clercq J; Deroover K; Flouris G; Lontkovskyi D; Lowette S; Moortgat S; Moreels L; Python Q; Skovpen K; Tavernier S; Van Doninck W; Van Mulders P; Van Parijs I; Brun H; Clerbaux B; De Lentdecker G; Delannoy H; Fasanella G; Favart L; Goldouzian R; Grebenyuk A; Karapostoli G; Lenzi T; Luetic J; Maerschalk T; Marinov A; Randle-conde A; Seva T; Vander Velde C; Vanlaer P; Vannerom D; Yonamine R; Zenoni F; Zhang F; Cimmino A; Cornelis T; Dobur D; Fagot A; Gul M; Khvastunov I; Poyraz D; Roskas C; Salva S; Tytgat M; Verbeke W; Zaganidis N; Bakhshiansohi H; Bondu O; Brochet S; Bruno G
    Search results are presented for physics beyond the standard model in final states with two opposite-charge, same-flavor leptons, jets, and missing transverse momentum. The data sample corresponds to an integrated luminosity of 35.9 fb−1 of proton-proton collisions at s=13 TeV collected with the CMS detector at the LHC in 2016. The analysis uses the invariant mass of the lepton pair, searching for a kinematic edge or a resonant-like excess compatible with the Z boson mass. The search for a kinematic edge targets production of particles sensitive to the strong force, while the resonance search targets both strongly and electroweakly produced new physics. The observed yields are consistent with the expectations from the standard model, and the results are interpreted in the context of simplified models of supersymmetry. In a gauge mediated supersymmetry breaking (GMSB) model of gluino pair production with decay chains including Z bosons, gluino masses up to 1500–1770 GeV are excluded at the 95% confidence level depending on the lightest neutralino mass. In a model of electroweak chargino-neutralino production, chargino masses as high as 610 GeV are excluded when the lightest neutralino is massless. In GMSB models of electroweak neutralino-neutralino production, neutralino masses up to 500-650 GeV are excluded depending on the decay mode assumed. Finally, in a model with bottom squark pair production and decay chains resulting in a kinematic edge in the dilepton invariant mass distribution, bottom squark masses up to 980–1200 GeV are excluded depending on the mass of the next-to-lightest neutralino.
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    Search for single production of vector-like quarks decaying to a b quark and a Higgs boson
    (Springer Nature, 2018-06-05) Sirunyan AM; Tumasyan A; Adam W; Ambrogi F; Asilar E; Bergauer T; Brandstetter J; Brondolin E; Dragicevic M; Erö J; Escalante Del Valle A; Flechl M; Friedl M; Frühwirth R; Ghete VM; Grossmann J; Hrubec J; Jeitler M; König A; Krammer N; Krätschmer I; Liko D; Madlener T; Mikulec I; Pree E; Rad N; Rohringer H; Schieck J; Schöfbeck R; Spanring M; Spitzbart D; Taurok A; Waltenberger W; Wittmann J; Wulz CE; Zarucki M; Chekhovsky V; Mossolov V; Suarez Gonzalez J; De Wolf EA; Di Croce D; Janssen X; Lauwers J; Van De Klundert M; Van Haevermaet H; Van Mechelen P; Van Remortel N; Abu Zeid S; Blekman F; D’Hondt J; De Bruyn I; De Clercq J; Deroover K; Flouris G; Lontkovskyi D; Lowette S; Marchesini I; Moortgat S; Moreels L; Python Q; Skovpen K; Tavernier S; Van Doninck W; Van Mulders P; Van Parijs I; Beghin D; Bilin B; Brun H; Clerbaux B; De Lentdecker G; Delannoy H; Dorney B; Fasanella G; Favart L; Goldouzian R; Grebenyuk A; Kalsi AK; Lenzi T; Luetic J; Maerschalk T; Marinov A; Seva T; Starling E; Vander Velde C; Vanlaer P; Vannerom D; Yonamine R; Zenoni F; Cornelis T; Dobur D; Fagot A; Gul M; Khvastunov I; Poyraz D; Roskas C; Salva S; Trocino D; Tytgat M; Verbeke W; Vit M
    A search is presented for single production of heavy vector-like quarks (B) that decay to a Higgs boson and a b quark, with the Higgs boson decaying to a highly boosted b b ¯ pair reconstructed as a single collimated jet. The analysis is based on data collected by the CMS experiment in proton-proton collisions at s=13 TeV, corresponding to an integrated luminosity of 35.9 fb−1. The data are consistent with background expectations, and upper limits at 95% confidence level on the product of the B quark cross section and the branching fraction are obtained in the range 1.28–0.07 pb, for a narrow B quark with a mass between 700 and 1800 GeV. The production of B quarks with widths of 10, 20 and 30% of the resonance mass is also considered, and the sensitivities obtained are similar to those achieved in the narrow width case. This is the first search at the CERN LHC for the single production of a B quark through its fully hadronic decay channel, and the first study considering finite resonance widths of the B quark.