CMS-PAS-B2G-13-008

CMS-PAS-B2G-13-008
A search for resonant ttbar production in all final states in pp collisions at sqrt(s) = 8 TeV
CMS Collaboration
March 2015

Abstract: A search is presented for the production of heavy resonances decaying into top-antitop quark pairs in events with three different final states, defined by the number of leptons from the tt $\to$ WbWb decay. The data correspond to an integrated luminosity of 19.7 fb$^{−1}$ and was collected by the CMS detector in proton-proton collisions at $\sqrt{s} =$ 8 TeV. The selections are optimized for reconstruction of top quarks with high Lorentz boosts, where jet substructure techniques are used to enhance the sensitivity. No significant excess of events over the expected yield from standard model pro- cesses is observed. Upper limits on the production cross section of heavy resonances decaying to tt are calculated using all channels. A narrow leptophobic topcolor Z′ resonance with a mass below 2.4 TeV is excluded at a 95% confidence level. Limits are also derived for a broad Z′ resonance with 10% width and a Kaluza-Klein excitation of the gluon in the Randall-Sundrum model.
Links: CDS record (PDF) ; inSPIRE record ; Public twiki page ; CADI line (restricted) ; These preliminary results are superseded in this paper, PRD 93 (2016) 012001. The superseded preliminary plots can be found here.

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