“上帝粒子”是什么

北京时间7月4日据路透社报道，欧洲核子研究中心科学家们发现了一种新的亚原子粒子，这可能是难以捉摸的希格斯玻色子（上帝粒子），而希格斯玻色子被认为是宇宙形成的关键。此新闻引起广泛的社会关注。科学网邀请中科院高能物理所研究员邢志忠、中科院理论物理研究所博士鲍得海就此事件与网友在线交流。

访谈内容(共146个问题,85个回复)

全部问答

universeman：对邢志忠 gluon有没有质量？既然它跟W Z玻色子都是传递力的玻色子，它的质量起源是通过Higgs机制么？
2012-07-06 15:31

本期嘉宾

邢志忠：不是，它没有质量，因为SU(3)色规范群没有破缺。
2012-07-06 15:32

ymch5010：对邢志忠 Higgs 场可以为很多种粒子提供质量（或者部分提供），并且大多数粒子都有质量。这也就是说Higgs 场极其容易与大多数的粒子相互作用，且到处充斥着Higgs场。那么为什么它这么难找呢？应该很容易就找到呀？多谢！
2012-07-06 15:28

本期嘉宾

邢志忠：简单说，它不带电，就不如带电的好找。其次，它与费米子的耦合正比于费米子质量，比如与电子耦合，正比于m(e)/v, 其中m(e) = 0.5 MeV, v = 246 GeV，所以这个耦合系数压低得很厉害。要看到它，需要先产生足够多的事例数。
2012-07-06 15:32

sunyu367：对邢志忠 \"邢志忠：不是，不符合费密子的性质。\" 是因为自旋问题吗?
2012-07-06 15:27

本期嘉宾

邢志忠：对，自旋是一个基本量。整数自选的是玻色子，半整数的是费米子。
2012-07-06 15:29

wangxiong868：对邢志忠 Did they confirm that the new particle is higgs in SM? Anyway, SM is far from perfect, how do you see the following open questions * Why are there three families of quarks and leptons? * Why does one family consist of fQ; uR; dR; L; erg? * Why is the electric charge quantized? * Why is the local gauge group SU(3)c SU(2)L U(1)Y? * Why is the spacetime four-dimensional? * Why is there 26 free parameters? * What is the origin of quark and lepton masses and mixings? * What is the origin of CP violation? * What is the origin of matter-antimatter asymmetry? * What is the nature of dark matter? * What is the role of gravity? * Why is the electroweak scale (100 GeV) much lower than the Planck scale (1019 GeV)?
2012-07-06 15:25

本期嘉宾

邢志忠：Not yet, but it seems that this new guy is very close to the SM Higgs particle. All the questions that you have raised are fundamentally important, and the SM itself can only answer a part of them or none of them. That is why one has to go beyond the SM to gain a better understanding of the matter strucutre and the cosmos.
2012-07-06 15:28