Mirror Quarks II

The biggest problem with the idea that an antiquark is a fixed state of a mirror quark is: it seems that the earlier D0 measurement of the mass difference (between $t$ and $\overline{t}$) finds an anomaly of similar magnitude, but opposite sign to the CDF result. Well, perhaps all charged particles have ordinary antiparticles after all. But something strange is definitely going on with the top quarks!