Search for high-mass resonances in dilepton final states in proton-proton collisions at √<i>s</i>=13 TeV



Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Asilar, E, Bergauer, T, Brandstetter, J, Brondolin, E, Dragicevic, M, Eroe, J
et al (show 2287 more authors) (2018) Search for high-mass resonances in dilepton final states in proton-proton collisions at √<i>s</i>=13 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2018 (6). pp. 1-43.

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title> <jats:p>A search is presented for new high-mass resonances decaying into electron or muon pairs. The search uses proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the CMS experiment at the LHC in 2016, corresponding to an integrated luminosity of 36 fb<jats:sup>−1</jats:sup>. Observations are in agreement with standard model expectations. Upper limits on the product of a new resonance production cross section and branching fraction to dileptons are calculated in a model-independent manner. This permits the interpretation of the limits in models predicting a narrow dielectron or dimuon resonance. A scan of different intrinsic width hypotheses is performed. Limits are set on the masses of various hypothetical particles. For the <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ {Z}_{\mathrm{SSM}}^{\prime}\left({Z}_{{}^{\psi}}^{\prime}\right) $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Z</mml:mi> <mml:mrow> <mml:mi>S</mml:mi> <mml:mi>S</mml:mi> <mml:mi>M</mml:mi> </mml:mrow> <mml:mo>′</mml:mo> </mml:msubsup> <mml:mfenced> <mml:msubsup> <mml:mi>Z</mml:mi> <mml:msup> <mml:mrow /> <mml:mi>ψ</mml:mi> </mml:msup> <mml:mo>′</mml:mo> </mml:msubsup> </mml:mfenced> </mml:math> </jats:alternatives> </jats:inline-formula> particle, which arises in the sequential standard model (superstring-inspired model), a lower mass limit of 4.50 (3.90) TeV is set at 95% confidence level. The lightest Kaluza-Klein graviton arising in the Randall-Sundrum model of extra dimensions, with coupling parameters <jats:italic>k</jats:italic>/<jats:italic>M</jats:italic> <jats:sub>Pl</jats:sub> of 0.01, 0.05, and 0.10, is excluded at 95% confidence level below 2.10, 3.65, and 4.25 TeV, respectively. In a simplified model of dark matter production via a vector or axial vector mediator, limits at 95% confidence level are obtained on the masses of the dark matter particle and its mediator. </jats:p>

Item Type: Article
Uncontrolled Keywords: Beyond Standard Model, Hadron-Hadron scattering (experiments), Lepton production, Particle and resonance production
Depositing User: Symplectic Admin
Date Deposited: 05 Dec 2019 16:49
Last Modified: 13 Oct 2023 03:01
DOI: 10.1007/JHEP06(2018)120
Open Access URL: https://doi.org/10.1007/JHEP06(2018)120
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3065025