Search for dark matter and unparticles produced in association with a Z boson in proton-proton collisions at √s=8 TeV
Search for dark matter and unparticles produced in association with a Z boson in proton-proton collisions at √s=8 TeV
A search for evidence of particle dark matter (DM) and unparticle production at the LHC has been performed using events containing two charged leptons, consistent with the decay of a Z boson, and large missing transverse momentum. This study is based on data collected with the CMS detector corresponding to an integrated luminosity of 19.7 fb−1 of pp collisions at the LHC at a center-of-mass energy of 8 TeV. No significant excess of events is observed above the number expected from the standard model contributions. The results are interpreted in terms of 90% confidence level limits on the DM-nucleon scattering cross section, as a function of the DM particle mass, for both spin-dependent and spin-independent scenarios. Limits are set on the effective cutoff scale Λ, and on the annihilation rate for DM particles, assuming that their branching fraction to quarks is 100%. Additionally, the most stringent 95% confidence level limits to date on the unparticle model parameters are obtained.
Khachatryan, Vardan
375bcfe5-df1a-41ad-9a90-553e557ef6d6
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
22 March 2016
Khachatryan, Vardan
375bcfe5-df1a-41ad-9a90-553e557ef6d6
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
The CMS Collaboration
(2016)
Search for dark matter and unparticles produced in association with a Z boson in proton-proton collisions at √s=8 TeV.
Physical Review D, D93 (5), [052011].
(doi:10.1103/PhysRevD.93.052011).
Abstract
A search for evidence of particle dark matter (DM) and unparticle production at the LHC has been performed using events containing two charged leptons, consistent with the decay of a Z boson, and large missing transverse momentum. This study is based on data collected with the CMS detector corresponding to an integrated luminosity of 19.7 fb−1 of pp collisions at the LHC at a center-of-mass energy of 8 TeV. No significant excess of events is observed above the number expected from the standard model contributions. The results are interpreted in terms of 90% confidence level limits on the DM-nucleon scattering cross section, as a function of the DM particle mass, for both spin-dependent and spin-independent scenarios. Limits are set on the effective cutoff scale Λ, and on the annihilation rate for DM particles, assuming that their branching fraction to quarks is 100%. Additionally, the most stringent 95% confidence level limits to date on the unparticle model parameters are obtained.
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Published date: 22 March 2016
Organisations:
Physics & Astronomy
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Local EPrints ID: 408350
URI: http://eprints.soton.ac.uk/id/eprint/408350
ISSN: 1550-7998
PURE UUID: f6b2bf99-6d61-405e-bb14-9ba24b508f02
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Date deposited: 19 May 2017 04:04
Last modified: 09 Jan 2022 03:24
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Author:
Vardan Khachatryan
Corporate Author: The CMS Collaboration
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