Search for Narrow Resonances in Dilepton Mass Spectra in Proton–proton Collisions At √s = 13 TeV and Combination with 8 TeV Data
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Author(s)
CMS Collaboration
Abercrombie, Daniel Robert
Allen, Brandon Leigh
Apyan, Aram
Barbieri, Richard Alexander
Baty, Austin Alan
Bi, Ran
Bierwagen, Katharina
Brandt, Stephanie Akemi
Busza, Wit
Date Issued
February 2017
Journal
Physics Letters B
Publisher
Elsevier BV
Citation
Khachatryan, V. et al. “Search for Narrow Resonances in Dilepton Mass Spectra in Proton–proton Collisions At √s = 13 TeV and Combination with 8 TeV Data.” Physics Letters B 768 (May 2017): 57–80 © 2017 The Authors
Version
Final published version
Abstract
A search for narrow resonances in dielectron and dimuon invariant mass spectra has been performed using data obtained from proton–proton collisions at √s = 13 TeV collected with the CMS detector. The integrated luminosity for the dielectron sample is 2.7 fb⁻¹ and for the dimuon sample 2.9 fb⁻¹. The sensitivity of the search is increased by combining these data with a previously analyzed set of data obtained at s=8 TeV and corresponding to a luminosity of 20 fb⁻¹. No evidence for non-standard-model physics is found, either in the 13 TeV data set alone, or in the combined data set. Upper limits on the product of production cross section and branching fraction have also been calculated in a model-independent manner to enable interpretation in models predicting a narrow dielectron or dimuon resonance structure. Limits are set on the masses of hypothetical particles that could appear in new-physics scenarios. For the ZSSM′particle, which arises in the sequential standard model, and for the superstring inspired Zψ′particle, 95% confidence level lower mass limits for the combined data sets and combined channels are found to be 3.37 and 2.82 TeV, respectively. The corresponding limits for the lightest Kaluza–Klein graviton arising in the Randall–Sundrum model of extra dimensions with coupling parameters 0.01 and 0.10 are 1.46 and 3.11 TeV, respectively. These results significantly exceed the limits based on the 8 TeV LHC data. Keywords: CMS; Dileptons; Narrow resonances; Extra dimensions
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1016/J.PHYSLETB.2017.02.010
