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Neutronium, hypothetical nuclei consisting only of neutrons (more than one). Examples include the tetraneutron. Preons were suggested as subparticles of quarks and leptons, but modern collider experiments have all but ruled out their existence. Rishons, particles from the Rishon model of preons. From superseded and obsolete theories
All the particles of the Standard Model have been experimentally observed, including the Higgs boson in 2012. [2] [3] Many other hypothetical elementary particles, such as the graviton, have been proposed, but not observed experimentally.
Pages in category "Hypothetical particles" The following 19 pages are in this category, out of 19 total. This list may not reflect recent changes. *
Hypothetical particles and states of matter that have not yet been encountered, but whose properties would be within the realm of mainstream physics if found to exist. Several particles whose existence has been experimentally confirmed that are conjectured to be exotic hadrons and within the Standard Model .
Pages in category "Hypothetical elementary particles" The following 44 pages are in this category, out of 44 total. This list may not reflect recent changes.
This is a timeline of subatomic particle discoveries, including all particles thus far discovered which appear to be elementary (that is, indivisible) given the best available evidence. It also includes the discovery of composite particles and antiparticles that were of particular historical importance. More specifically, the inclusion criteria ...
Scientists potentially uncovered a glueball particle, an enigmatic entity believed to be made entirely of the strong nuclear force's gluons.
If superpartners are found, their masses would indicate the scale at which supersymmetry is broken. [1] [4] For particles that are real scalars (such as an axion), there is a fermion superpartner as well as a second, real scalar field. For axions, these particles are often referred to as axinos and saxions.