Search for dark matter and unparticles produced in association with a Z boson in proton-proton collisions at root s=8 TeVopen access
- Authors
- Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A .; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Kim, Tae Jeong
- Issue Date
- Mar-2016
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW D, v.93, pp.1 - 29
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW D
- Volume
- 93
- Start Page
- 1
- End Page
- 29
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/154906
- DOI
- 10.1103/PhysRevD.93.052011
- ISSN
- 2470-0010
- 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., 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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