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Download as PDF; Printable version; ... an elementary particle or fundamental particle is a subatomic ... The most fundamental of these are normally called preons ...
This also means it is the first elementary scalar particle discovered in nature. Elementary bosons responsible for the four fundamental forces of nature are called force particles ( gauge bosons ). The strong interaction is mediated by the gluon , the weak interaction is mediated by the W and Z bosons, electromagnetism by the photon, and ...
Interest in preon models peaked in the 1980s but has slowed, as the Standard Model of particle physics continues to describe physics mostly successfully, and no direct experimental evidence for lepton and quark compositeness has been found. Preons come in four varieties: plus, anti-plus, zero, and anti-zero.
The free fields care for particles in isolation, whereas processes involving several particles arise through interactions. The idea is that the state vector should only change when particles interact, meaning a free particle is one whose quantum state is constant. This corresponds to the interaction picture in quantum mechanics.
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The Harari–Shupe preon model (also known as rishon model, RM) is the earliest effort to develop a preon model to explain the phenomena appearing in the Standard Model (SM) of particle physics. [1] It was first developed independently by Haim Harari and by Michael A. Shupe [2] and later expanded by Harari and his then-student Nathan Seiberg. [3]
The Standard Model of particle physics is the theory describing three of the four known fundamental forces (electromagnetic, weak and strong interactions – excluding gravity) in the universe and classifying all known elementary particles.
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. Significantly, the X and Y bosons couple quarks (constituents of protons and others) to leptons (such as positrons), allowing violation of the conservation ...
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