X and Y bosons
In particle physics, the X and Y bosons are hypothetical elementary particles analogous to the W and Z bosons, but corresponding to a unified force predicted by the Georgi–Glashow model, a grand unified theory. Wikipedia
Mass: ≈ 1015 GeV/c2
B − L: ±2/3
Color charge: triplet or antitriplet
Electric charge: X: ±4/3 e; Y: ±1/3 e
Spin: 1
Weak hypercharge: ±5/6
Weak isospin projection: X: ±1/2; Y: ∓1/2