Light dark matter from the U(1){sub X} sector in the NMSSM with gauge mediation

Cosmic ray anomalies observed by PAMELA and Fermi-LAT experiments may be interpreted by heavy (TeV-scale) dark matter annihilation enhanced by Sommerfeld effects mediated by a very light (sub-GeV) U(1){sub X} gauge boson, while the recent direct searches from CoGeNT and DAMA/LIBRA experiments may in...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2011-01, Vol.2011 (1)
Main Authors: Kang, Zhaofeng, Li, Tianjun, Liu, Tao, Tong, Chunli, Yang, Jin Min
Format: Article
Language:English
Subjects:
ANNIHILATION
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BOSONS
COSMIC RADIATION
COSMOLOGY
DENSITY
GAUGE INVARIANCE
GEV RANGE
NONLUMINOUS MATTER
PARTICLE DECAY
SPARTICLES
STANDARD MODEL
SUPERSYMMETRY
TEV RANGE
UNIVERSE
WEAK INTERACTIONS
YUKAWA POTENTIAL
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Summary:Cosmic ray anomalies observed by PAMELA and Fermi-LAT experiments may be interpreted by heavy (TeV-scale) dark matter annihilation enhanced by Sommerfeld effects mediated by a very light (sub-GeV) U(1){sub X} gauge boson, while the recent direct searches from CoGeNT and DAMA/LIBRA experiments may indicate a rather light ( ∼ 7 GeV) dark matter with weak interaction. Motivated by these apparently different scales, we consider a gauge mediated next-to-the minimal supersymmetric standard model (NMSSM) entended with a light U(1){sub X} sector plus a heavy sector ( H-bar {sub h},H{sub h}), which can provide both a light ( ∼ 7 GeV) and a heavy (TeV-scale) dark matter without introducing any ad hoc new scale. Through the Yukawa coupling between H{sub h} and the messager fields, the U(1){sub X} gauge symmetry is broken around the GeV scale radiatively and a large negative m{sub S}{sup 2} is generated for the NMSSM singlet S. Furthermore, the small kinetic mixing parameter between U(1){sub X} and U(1){sub Y} is predicted to be θ ∼ 10{sup −5}−10{sup −6} after integrating out the messengers. Such a light dark matter, which can have a normal relic density from the late decay of the right-handed sneutrino (assumed to be the ordinary next-to-the lightest supersymmetric particle and thermally produced in the early Universe), can serve a good candidate to explain the recent CoGeNT and DAMA/LIBRA results.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2011/01/028