Light Dark Matter Models with Isospin Violation

Details Light Dark Matter Models with Isospin Violation Light Dark Matter Models with Isospin Violation

2011-07-18

arxiv.org/abs/1107.3529v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

30 pages,one figure

Scientific paper

Light dark matter (DM) models with isospin violation (ISV) and large DM-nucleon spin-independent cross section \sigma_n may provide a way to understand the confusing DM direct detection experimental results. Combining with stringent astrophysical and collider constraints, we can further deduce the DM properties. In light of general operator analyses, we systematically study the ISV operators with f_n/f_p < 0, and show that the required ISV f_n/f_p \simeq -0.7 must arise from the DM and first-family quark couplings. Then we discuss three kinds of the ISV models classified by the mediators: a light Z' gauge boson in the extra U(1)_X model, a (approximate) spectator Higgs doublet, and color triplets. In particular, the spectator Higgs doublet model can explain the Tevatron CDF W+jj anomaly simultaneously. In addition, although the U(1)_X gauge boson Z' which has kinetic mixing with U(1)_Y gauge boson only generates f_n=0, we can combine it with the conventional Higgs Yukawa couplings to achieve the proper ISV. Especially, most of our models can address the recent GoGeNT annual modulation as well as all the other DM direct detection experiments. As a concrete example, we propose the U(1)_X model where the U(1)_X charged light sneutrino is the inelastic DM (iDM), and dominantly decays to the light dark states such as Z' (M_{Z'}< 1 GeV). With ISV it is consistent with all the DM direct detection experiments and satisfies all the other constraints.

Affiliated with

Also associated with

No associations

Rating

Light Dark Matter Models with Isospin Violation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Light Dark Matter Models with Isospin Violation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Light Dark Matter Models with Isospin Violation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-272459