In recent years, measurements of neutrino mass have provided the first experimental deviations from the Standard Model, since neutrinos are massless in the Standard Model.. In the 20th century, physicists began exploring the goings on at the smallest levels of matter, and among their most startling modern discoveries was the amount of different particles in the universe.  It may involve work on supersymmetry, alternatives to the Higgs mechanism, extra spatial dimensions (such as the Randall–Sundrum models), Preon theory, combinations of these, or other ideas. The word atom, after the Greek word atomos meaning "indivisible", has since then denoted the smallest particle of a chemical element, but physicists soon discovered that atoms are not, in fact, the fundamental particles of nature, but are congl… An elementary particle. | Meaning, pronunciation, translations and examples Particle definition: A particle of something is a very small piece or amount of it.  The particles. Definition of "Physics" by Microsoft Encarta “A major science dealing with the fundamental constituents of the universe, the forces they exert on one another, and the results produced by these forces. 2.  The word atom, after the Greek word atomos meaning "indivisible", has since then denoted the smallest particle of a chemical element, but physicists soon discovered that atoms are not, in fact, the fundamental particles of nature, but are conglomerates of even smaller particles, such as the electron. Protons and neutrons are nucleons, the type of baryon which together form the composite particle that is the nucleus of an atom. the study of fundamental particles and their propertiesAlso called: high-energy physics. Atomic physics, the scientific study of the structure of the atom, its energy states, and its interactions with other particles and with electric and magnetic fields. In current understanding, these elementary particles are excitations of the quantum fields that also govern their interactions. Similarly, protons are nucleons, baryons, hadrons, and also fermions. If the theory is successful, it may be considered a "Theory of Everything", or "TOE". It attempts to describe and account for the properties of molecules and atoms and their constituents— electrons, protons, neutrons, and other more esoteric particles such … One important branch attempts to better understand the Standard Model and its tests. The only way to really keep these different particle groups separate is to just carefully study them and try to be careful about which name is being used. Elementary particle physics aims to find the remaining particles. One important non-collider effort is the determination of the neutrino masses, since these masses may arise from neutrinos mixing with very heavy particles. 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