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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

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.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Phys. Rev. D, Vol. 93, Num. 5, Pag. 052011 (2016)

Editorial: American Physical Society

 Fecha de publicación: 01/03/2016

Nº de páginas: 29

Tipo de publicación: Artículo de Revista

 DOI: 10.1103/PhysRevD.93.052011

ISSN: 1550-7998,1550-2368,2470-0010,2470-0029

Url de la publicación: https://doi.org/10.1103/PhysRevD.93.052011

Autores/as

KHACHATRYAN, VLADIMIR

JUAN RAMON CASTIÑEIRAS DE SAA

PABLO DE CASTRO MANZANO

JUAN GARCIA FERRERO

MARIA AMPARO LOPEZ VIRTO

RAFAEL JOSE MARCO DE LUCAS

ANA YAIZA RODRIGUEZ MARRERO