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Openai/69174844-9774-8012-8b69-32262ca5e35a
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===== 在电弱统一理论中，规范群是 SU(2)L×U(1)YSU(2)_L \times U(1)_YSU(2)L×U(1)Y。 ===== 这些规范玻色子一开始都是无质量的，但通过自发对称性破缺（Higgs 机制）， 其中三个组合吸收了希格斯场的 Goldstone 模式，获得质量（成为 W⁺、W⁻、Z⁰）， 剩下未破缺的组合对应的无质量规范场就是光子。 :
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