Correlation between outstanding hints in experimental particle physics

Question

The 115 GeV ATLAS Higgs with enhanced diphoton decays has gone away but there are several other recent tantalizing hints relevant for particle physics, namely

• CoGeNT's 7-8 GeV dark matter particle that seems to support DAMA's and other signals
• D0's fourth-generation top prime quark that may be there at 325 GeV if a 3-sigma signal is right
• CDF's "new" force Z prime boson at 144 GeV which could be there if another 3-sigma bump is real
• Tevatron's top-antitop asymmetry above 400 GeV which seems very large
• A related CDF top-quark anomaly

and maybe others I missed. My question is simple:

Is there some sensible theoretical basis (e.g. paper) that would simultaneously explain at least two of the observations above if they were real?

Answer 1

See arXiv:1104.3145, 1103.6035 and 1104.4127.

Answer 2

My NEW preference is the scalar with charge +4/3 that is being postulated as an explanation for the top-antitop asymmetry.

There are some published papers pursuing this idea, such as arXiv:1103.2757 or arXiv:0912.0972 and a couple of mini reviews arXiv:1108.3341 and arXiv:1107.0841.

As of today I can not tell which papers are the most relevant (see an explicit question migrated from the old Theoretical Physics Stack Exchange site). I think that they have a potential to explain some of the other observations because the charge in some GUT models has a contribution from B-L and a contribution from SU(2) chiral groups, so the +4/3 is nor really so exotic.

In any case, take my answer with a bit of salt. As the uppercase acrostic indicates in the first paragraph, I also have some personal motivations to support models along this line, because I tripped into these pesky +4/3 things back in 2005 and I really want to understand how they fit.