CMS-PAS-EXO-19-019

CMS-PAS-EXO-19-019
Search for a narrow resonance in high-mass dilepton final states in proton-proton collisions using 140 fb $^{-1}$ of data at $\sqrt{s}=$ 13 TeV
CMS Collaboration
August 2019

Abstract: A search for physics beyond the standard model is presented using electron or muon pairs with high invariant mass. A data set of proton-proton collisions collected by the CMS experiment at the LHC at $\sqrt{s}=$ 13 TeV recorded in years 2016 to 2018 and corresponding to a total integrated luminosity of up to 140 fb $^{-1}$ is analyzed. No significant deviation is observed with respect to the expectation from the standard model backgrounds. Upper limits are set on the ratio of the production cross section times branching ratio of a new narrow dilepton resonance to that of the Z boson and converted into lower limits on the masses of various hypothetical particles. A $\mathrm{Z}'_{SSM}$ ( $\mathrm{Z}'_{\psi}$ ) particle, arising in the sequential standard model (superstring-inspired model) is excluded below a mass of 5.15 (4.56) TeV at 95% confidence level.
Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; These preliminary results are superseded in this paper, Accepted by JHEP. The superseded preliminary plots can be found here.

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