Search for narrow resonances in dilepton mass spectra in proton–proton collisions at s=13 TeV and combination with 8 TeV data
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. T...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English English |
| Published: |
Elsevier B.V.
2017
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/63110/ http://irep.iium.edu.my/63110/ http://irep.iium.edu.my/63110/ http://irep.iium.edu.my/63110/1/63110_Search%20for%20narrow%20resonances%20in%20dilepton_article.pdf http://irep.iium.edu.my/63110/2/63110_Search%20for%20narrow%20resonances%20in%20dilepton_scopus.pdf http://irep.iium.edu.my/63110/13/63110_Search%20for%20narrow%20resonances%20in%20dilepton_wos.pdf |
| Summary: | 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 nonstandard-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 Z
SSM particle, which arises in the sequential standard model, and for
the superstring inspired Z
ψ 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 |
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