Has dark matter particle been observed?
Lubos tells about claim that axions coming from Sun and transformed in Earth's magnetic field to X rays in keV range have been observed. The mass of the axion - to be distinguished from its much higher energy - would be few microeVs, which is rather small and corresponds to a p-adic length scale L(k=207) of about .5 meters. The next prime k=211 would give p-adic scale of 2 meters.
This brings in mind TGD explanation (see this) of and old anomaly - the production of electron positron pairs in collisions of heavy nuclei just above the Coulomb wall - in terms of production of axion-like states in the strong non-orthogonal electric and magnetic fields of colliding giving rise to non-vanishing "instanton density" E•B which generates coherent states of electropions which are bound states of color octet excitations of electron and positrons. Electropions would decay to electron positron pairs and gamma pairs. Later also other leptopion candidates have been detected. Unfortunately they do not represent dark matter in the sense of the prevailing dogmatics so that they have b den forgotten.
Color excited electrons should not be produced in the decays of weak bosons so that they must be either very heavy as free particle or dark in TGD sense and thus having non-standard value of Planck constant given as multiple heff=n× h. Same "instanton" coupling would cause the transformations of solar axions to X rays and the change of the orientation of the Earth's magnetic field with respect to Sun would imply the characteristic variation allowing to detect the small signal from large background.
Perhaps the simplest production mechanism would be the time reversal of the mechanism assumed to produce the ob served anomalous X rays. X rays from Sun could transform to axions in the magnetic fields of the sunspots. This would predict correlation with sunspot activity.
There have been also earlier reports about axion candidates at rather low masses and p-adic length scale hierarchy and dark matter hierarchy realized in terms of heff would provide a generic explanation. In biology both hierarchies of QCD type and weak physics could play a central role. Big Science is often experienced as a reductionistic invasion proceeding towards shorter and short length scales and this view still dominates physics although the construction of new accelerators is becoming more and more expensive. Big things have big inertia and it takes a long time for Big Science to be able to turn its direction and return to the regions which it has considered to be already conquered.