Graham Dungworth provides us with a report on the Fermilab D0 seminar about the bump. To be or not to be? Let us assume that these two collaborations are competent and that the detectors are well understood. Then, as Pitkanen points out, a crackpot theorist is obliged to consider the logical scenario: both D0 and CDF are correct. To this end, behold the Tevatron map:
Observe that the injector point (the pink arrow) and the two detectors roughly divide the ring into thirds. The protons are sent anticlockwise and the antiprotons clockwise. There is thus one major difference between the CDF and D0 locations: for D0 the protons travel further than the antiprotons do, whereas for CDF it is the other way around. If there was an oscillation involving both the constituent quarks and the antiquarks (they do have a mixing matrix, after all) the characteristic phase for (dark) mirror quarks could oscillate around the ring, with a significant amplitude at one detector but not at the other.
The bump dichotomy would then be just one more line of evidence of a difference between what we usually think of as matter and antimatter. Recall that this is not the first surprising difference between CDF and D0 results. Their measurements of a non zero mass difference for the (so called) top and antitop quarks had the same magnitude, but opposite sign, as if at least a component of quark mass really does depend on ring distance. To be or not to be? That is the question!
7 years ago