An X boson would have the following two
decay modes: where the two decay products in each process have opposite
chirality, is an
up quark, is a
down antiquark, and is a
positron. A Y boson would have the following three
decay modes: where is an
up antiquark and is an
electron antineutrino. The first product of each decay has left-handed
chirality and the second has right-handed
chirality, which always produces one fermion with the same handedness that would be produced by the decay of a
W boson, and one fermion with contrary handedness ("wrong handed"). Similar decay products exist for the other
quark–lepton generations. In these reactions, neither the
lepton number () nor the
baryon number () is separately conserved, but the combination is. Different
branching ratios between the X boson and its antiparticle (as is the case with the
kaon) would explain
baryogenesis. For instance, if an / pair is created out of energy, and they follow the two branches described above: re-grouping the result shows it to be a hydrogen atom.
Origin The X and Y bosons are defined respectively as the six and the six components of the final two terms of the adjoint
24 representation of
SU(5) as it transforms under the standard model's group: \mathbf{24}\rightarrow (8,1)_0\oplus (1,3)_0\oplus (1,1)_0\oplus (3,2)_{-\frac{5}{6}}\oplus (\bar{3},2)_{\frac{5}{6}}. The positively-charged X and Y carry anti-
color charges (equivalent to having two different normal color charges), while the negatively-charged X and Y carry normal
color charges, and the signs of the Y bosons'
weak isospins are always opposite the signs of their
electric charges. In terms of their action on \mathbb{C}^5, X bosons rotate between a color index and the
weak isospin-up index, while Y bosons rotate between a color index and the
weak isospin-down index. == See also ==