查看“溫伯格角”的源代码

'''温伯格角'''（{{lang-en|'''Weinberg angle'''}}，又叫'''弱混合角'''）是温伯格-萨拉姆的弱电统一理论<ref>
{{cite journal
 | author=S.L. Glashow
 | year=1961
 | title=Partial-symmetries of weak interactions
 | journal=Nuclear Physics
 | volume=22 | pages=579–588
 | doi=10.1016/0029-5582(61)90469-2
|bibcode = 1961NucPh..22..579G
 | issue=4 }}</ref> <ref name=Weinberg>
{{cite journal
 | author=S. Weinberg
 | year=1967
 | title=A Model of Leptons
 | journal=Physical Review Letters
 | volume=19 | pages=1264–1266
 | doi=10.1103/PhysRevLett.19.1264
| bibcode=1967PhRvL..19.1264W
 | issue=21
}}</ref><ref>
{{cite conference
 | author=A. Salam
 | editor=N. Svartholm
 | year=1968
 | booktitle=Elementary Particle Physics: Relativistic Groups and Analyticity
 | pages=367
 | conference=Eighth Nobel Symposium
 | publisher=Almquvist and Wiksell
 | location=Stockholm
}}</ref>的一个参数。

==温伯格角的由来与定义==

定义''&theta;''<sub>W</sub>
:<math>\tan \theta_W =\frac{g'}{g}</math>
由参考[2]中<ref name=Weinberg/>(10)及(11)式:
:<math>Z_\mu=({g^2}+{g'^2})^{-1/2}(g A_\mu^3+g' B_\mu)</math> ，
:<math>A_\mu=({g^2}+{g'^2})^{-1/2}(-g' A_\mu^3+g B_\mu)</math>.
有：
:<math> \begin{pmatrix}
A \\
Z \end{pmatrix} = \begin{pmatrix}
\cos \theta_W & \sin \theta_W \\
-\sin \theta_W & \cos \theta_W \end{pmatrix} \begin{pmatrix}
B \\
W \end{pmatrix} </math>
温伯格角也可定义成:<ref>
{{cite book
 |author=L. B. Okun
 |year=1982
 |title=Leptons and Quarks
 |page=214
 |publisher=[[North-Holland Publishing|North-Holland Physics Publishing]]
 |isbn=0-444-86924-7
}}</ref>

:<math>\cos\theta_W=\frac{m_W}{m_Z}</math>
== 温伯格角的测量值==
{{nowrap|sin<sup>2</sup>''&theta;''<sub>W</sub> {{=}} 0.2397 ± 0.0013}} 
== 參考文獻 ==
{{Reflist}}

[[Category:電弱理論]]