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

Search for high-mass resonances in dilepton final states in proton-proton collisions at s√=13 TeV
Search for high-mass resonances in dilepton final states in proton-proton collisions at s√=13 TeV
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−1. 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 Z′SSM(Z′ψ) 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 k/MPl 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.
1029-8479
Sirunyan, Albert M
7907272b-cb4e-4ffb-97b1-60a9ffc11d1b
Woods, N.
8f2bedbd-db47-45dd-add1-6f54693b0871
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
The CMS Collaboration
Sirunyan, Albert M
7907272b-cb4e-4ffb-97b1-60a9ffc11d1b
Woods, N.
8f2bedbd-db47-45dd-add1-6f54693b0871
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3

Woods, N. , The CMS Collaboration (2018) Search for high-mass resonances in dilepton final states in proton-proton collisions at s√=13 TeV. The Journal of High Energy Physics, 2018 (6), [120]. (doi:10.1007/JHEP06(2018)120).

Record type: Article

Abstract

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−1. 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 Z′SSM(Z′ψ) 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 k/MPl 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.

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Accepted/In Press date: 11 June 2018
e-pub ahead of print date: 22 June 2018
Published date: June 2018

Identifiers

Local EPrints ID: 431243
URI: http://eprints.soton.ac.uk/id/eprint/431243
ISSN: 1029-8479
PURE UUID: 56710f26-dd2a-403c-9f22-93224c884200
ORCID for Alexander Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

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Date deposited: 28 May 2019 16:30
Last modified: 18 Feb 2021 17:09

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Contributors

Author: Albert M Sirunyan
Author: N. Woods
Corporate Author: The CMS Collaboration

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