Short answers, pulled from the story.
Gauge bosons are elementary particles that act as force carriers for fundamental interactions. They mediate forces such as electromagnetism, the weak nuclear force, and the strong nuclear force. Without these particles, matter would not hold together and stars would not ignite.
The Standard Model identifies four distinct types of gauge bosons: the photon, the W boson, the Z boson, and the gluon. The photon carries the electromagnetic force, the W and Z bosons carry the weak interaction, and gluons carry the strong interaction. Each type corresponds to a specific mathematical group structure in quantum field theory.
The Higgs mechanism was confirmed in 2012 when the Higgs boson was discovered at the Large Hadron Collider. This discovery validated the theory that W and Z bosons acquire mass through interaction with the Higgs field. The confirmation resolved the contradiction between mathematical symmetry and experimental observations from the 1960s.
Gluons carry a property called color charge which allows them to bind quarks together to form protons and neutrons. Color confinement means that isolated gluons never exist in nature and are always trapped inside composite particles. This phenomenon ensures the strong force never reaches beyond the atomic nucleus.
X and Y bosons are hypothetical gauge bosons predicted by the Georgi-Glashow model to mediate interactions between quarks and leptons. These particles would be more massive than W and Z bosons and could cause protons to decay over immense timescales. Experiments at the Super-Kamiokande neutrino detector have found no evidence of their existence.
Gravity has no confirmed gauge boson within the current framework of the Standard Model. Theoretical physicists propose the existence of a particle called the graviton which would carry the gravitational force. The graviton remains a hypothetical entity until a mathematically coherent theory of quantum gravity is developed.