climax
发表于 2025-3-28 18:18:22
The standard model,the interaction in eq. (7.1) is non-renormalizable, since it contains operators with mass dimension 6; it is an effective theory, in the sense that it can only be used to compute amplitudes in the semi-classical approximation.
Ardent
发表于 2025-3-28 21:00:15
Textbook 20061st editionndard model of electroweak interactions, with special attention to the mechanism of particle mass generation. The extension of the standard model to include neutrino masses is also described....We have included a number of detailed computations of cross sections and decay rates of pedagogical and phenomenological relevance..
江湖郎中
发表于 2025-3-29 02:58:06
Introduction,regime, a large number of new particles is typically produced, with large momenta, or, equivalently, small wavelengths. For this reason, the scheme of ordinary Quantum Mechanics, based on the Schrödinger equation for wave functions that depend on a fixed number of variables, is no longer applicable.
改革运动
发表于 2025-3-29 03:19:52
Relativistic field theory,he electromagnetic fields, and Dirac and Yukawa fields. The field description of a physical system allows a direct implementation of the principle of covariance, that guarantees the invariance of the equations of motion under changes of reference frame, and of the principle of causality, which is co
cavity
发表于 2025-3-29 11:02:52
Feynman diagrams, the context of quantum electrodynamics. We define the following symbols: . Equation (3.89) is represented as . while the graphical form of eq. (3.90) is . It is understood that each internal vertex corresponds to a space-time integration.
商店街
发表于 2025-3-29 15:09:19
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推延
发表于 2025-3-29 16:33:10
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脖子
发表于 2025-3-29 21:11:54
The standard model,y of weak interactions. The Fermi Lagrangian density for . and . decays is given by. . From the measured values of muon and neutron lifetimes, . one obtains . while the value . can be extracted from the measurement of baryon semi-leptonic decay rates. The most striking feature of weak interactions,