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Study clarifies a key question in particle physics about muon's magnetic moment

 



Magnetic moment is an intrinsic property of a particle with spin, arising from interaction between the particle and a magnet or other object with a magnetic field. Like mass and electric charge, magnetic moment is one of the fundamental magnitudes of physics.


There is a difference between the theoretical value of the magnetic moment of a muon, a particle that belongs to the same class as the electron, and the values obtained in high-energy experiments conducted in particle accelerators. The difference only appears at the eighth decimal place, but scientists have been intrigued by it since it was discovered in 1948.

It is not a detail: it can indicate whether the muon interacts with dark matter particles or other Higgs bosons or even whether unknown forces are involved in the process.

The theoretical value of the muon's magnetic moment, represented by the letter g, is given by the Dirac equation—formulated by English physicist and 1933 Nobel Prize winner Paulo Dirac (1902-1984), one of the founders of quantum mechanics and quantum electrodynamics—as 2. However, experiments have shown that g is not exactly 2, and there is a great deal of interest in understanding "g-2", i.e., the difference between the experimental value and the value predicted by the Dirac equation.


International Research Conference on High Energy Physics and Computational Science

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