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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
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.
1550-7998
Khachatryan, Vardan
375bcfe5-df1a-41ad-9a90-553e557ef6d6
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
The CMS Collaboration
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).

Record type: Article

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

Identifiers

Local EPrints ID: 408350
URI: http://eprints.soton.ac.uk/id/eprint/408350
ISSN: 1550-7998
PURE UUID: f6b2bf99-6d61-405e-bb14-9ba24b508f02
ORCID for Alexander Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

Catalogue record

Date deposited: 19 May 2017 04:04
Last modified: 14 Mar 2020 01:30

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Contributors

Author: Vardan Khachatryan
Corporate Author: The CMS Collaboration

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