'a brilliant, twitchy arcade masterpiece that pulsates with originality and heart' - Pocket Gamer, 9/10 'a massively unique take on the endless runner genre' - Gamezebo, 4. Featured as one of the Best of 2013 apps on the App Store. The X ± and Y ± bosons are defined respectively as the six Q = ± 4 / 3 and the six Q = ± 1 / 3 components of the final two terms of the adjoint 24 representation of SU(5) as it transforms under the standard model's group:Ģ4 → ( 8, 1 ) 0 ⊕ ( 1, 3 ) 0 ⊕ ( 1, 1 ) 0 ⊕ ( 3, 2 ) − 5 6 ⊕ ( 3 ¯, 2 ) 5 6 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. Boson X is a fast-paced rotational runner set in a particle accelerator. − pair is created out of energy, and they follow the two branches described above: Different branching ratios between the X boson and its antiparticle (as is the case with the K-meson) would explain baryogenesis. In these reactions, neither the lepton number ( L) nor the baryon number ( B) is separately conserved, but the combination B − L is. Similar decay products exist for the other quark-lepton generations. 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"). Where the two decay products in each process have opposite chirality,Ī Y boson would have the following three decay modes: : 442 Since some grand unified theories such as the Georgi–Glashow model predict a half-life less than this, then the existence of X and Y bosons, as formulated by this particular model, remain hypothetical.Īn X boson would have the following two decay modes: : 442 However, the Super-Kamiokande has put a lower bound on the proton's half-life as around 10 34 years. Significantly, the X and Y bosons couple quarks (constituents of protons and others) to leptons (such as positrons), allowing violation of the conservation of baryon number thus permitting proton decay. Since the X and Y boson mediate the grand unified force, they would have unusual high mass, which requires more energy to create than the reach of any current particle collider experiment. In particle physics, the X and Y bosons (sometimes collectively called " X bosons" : 437 ) 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 (GUT). Y: two quarks, or one antiquark and one charged antilepton, or one antiquark and one antineutrino X: two quarks, or one antiquark and one charged antilepton For mesons with the same names, see XYZ particle. This article is about bosons of a hypothetical new interaction.
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