Artículos de revistas
Search for dark matter and unparticles produced in association with a Z boson in proton-proton collisions at root s=8 TeV
Fecha
2016-03-22Registro en:
Physical Review D. College Pk: Amer Physical Soc, v. 93, n. 5, 29 p., 2016.
2470-0010
10.1103/PhysRevD.93.052011
WOS:000372720400001
WOS000372720400001.pdf
Autor
Yerevan Phys Inst
OeAW
Natl Ctr Particle & High Energy Phys
Univ Antwerp
Vrije Univ Brussel
Univ Libre Bruxelles
Univ Ghent
Catholic Univ Louvain
Univ Mons
Ctr Brasileiro Pesquisas Fis
Universidade do Estado do Rio de Janeiro (UERJ)
Universidade Estadual Paulista (Unesp)
Universidade Federal do ABC (UFABC)
Bulgarian Acad Sci
Univ Sofia
Inst High Energy Phys
Peking Univ
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Rudjer Boskovic Inst
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Institución
Resumen
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.