("Third" since it has an electric charge of ⅓ e, or Tohu (תוהו) which means "Chaos") and V ("Vanishes", since it is electrically neutral, or Vohu which means "void"). All leptons and all flavours of quarks are three-rishon ordered triplets. These groups of three rishons have spin-½. The Rishon model illustrates some of the typical efforts in the field. Many of the preon models theorize that the apparent imbalance of matter and antimatter in the universe is in fact illusory, with large quantities of preon-level antimatter confined within more complex structures. Criticisms The mass paradox One preon model started as an internal paper at the Collider Detector at Fermilab (CDF) around 1994. The paper was written after an unexpected and inexplicable excess of jets with energies above 200 GeV were detected in the 1992–1993 running period. However, scattering experiments have shown that quarks and leptons are "point like" down to distance scales of less than m (or of a proton diameter). The momentum uncertainty of a preon (of whatever mass) confined to a box of this size is about 200 GeV/c, which is 50,000 times larger than the (model dependent) rest mass of an up-quark, and 400,000 times larger than the rest mass of an electron. Heisenberg's uncertainty principle states that and thus anything confined to a box smaller than would have a momentum uncertainty proportionally greater. Thus, the preon model proposed particles smaller than the elementary particles they make up, since the momentum uncertainty should be greater than the particles themselves. So the preon model represents a mass paradox: How could quarks or electrons be made of smaller particles that would have many orders of magnitude greater mass-energies arising from their enormous momenta? One way of resolving this paradox is to postulate a large binding force between preons that cancels their mass-energies.[Precursor to color charge?] Conflicts with observed physics Preon models propose additional unobserved forces or dynamics to account for the observed properties of elementary particles, which may have implications in conflict with observation. For example, now that the LHC's observation of a Higgs boson is confirmed, the observation contradicts the predictions of many preon models that excluded it. Preon theories require quarks and leptons to have a finite size. It is possible that the Large Hadron Collider will observe this after it is upgraded to higher energies. In popular culture In the 1948 reprint/edit of his 1930 novel