Description
I will outline arguments for the existence of a tightly bound 6-quark state (uuddss) with mass ~1.75 GeV, called the H-dibaryon. Remarkably, such a state is consistent with all observations, in the lab and on the lattice; I will discuss the most essential ones. With this mass it would be lighter than 2 protons, and hence stable. I will outline the physics governing its freezeout, and show that for natural values of the effective Lagrangian describing its interaction with other hadrons, one obtains the correct Dark Matter abundance and correct ratio of DM to ordinary matter. Being semi-strongly interacting with nucleons, it loses energy before reaching deep underground detectors so normal dark matter limits are not applicable. I will discuss the two experiments which can constrain it, XQC and DAMIC. If nuclear recoil is efficiently transferred to electron current in CCDs, and/or if the conventional assumption about the DM velocity distribution is correct, DAMIC and XQC taken together would exclude the H being (all of) the dark matter. However neither of these assumptions has been verified experimentally, so the limits may have a loophole; I look forward to discussing this with the audience.