Weak isospin | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-08

This is an audio version of the Wikipedia Article:
Weak isospin


00:02:03 1 Relation with chirality
00:05:43 2 Weak isospin and the W bosons
00:09:05 3 See also



Listening is a more natural way of learning, when compared to reading. Written language only began at around 3200 BC, but spoken language has existed long ago.

Learning by listening is a great way to:
- increases imagination and understanding
- improves your listening skills
- improves your own spoken accent
- learn while on the move
- reduce eye strain

Now learn the vast amount of general knowledge available on Wikipedia through audio (audio article). You could even learn subconsciously by playing the audio while you are sleeping! If you are planning to listen a lot, you could try using a bone conduction headphone, or a standard speaker instead of an earphone.

You can find other Wikipedia audio articles too at:
https://www.youtube.com/channel/UCuKfABj2eGyjH3ntPxp4YeQ

You can upload your own Wikipedia articles through:
https://github.com/nodef/wikipedia-tts



"The only true wisdom is in knowing you know nothing."
- Socrates



SUMMARY
=======
In particle physics, weak isospin is a quantum number relating to the weak interaction, and parallels the idea of isospin under the strong interaction. Weak isospin is usually given the symbol T or I with the third component written as 
  
    
      
        
          T
          
            
              z
            
          
        
      
    
    {\displaystyle T_{\mathrm {z} }}
  , 
  
    
      
        
          T
          
            3
          
        
      
    
    {\displaystyle T_{3}}
  , 
  
    
      
        
          I
          
            
              z
            
          
        
      
    
    {\displaystyle I_{\mathrm {z} }}
   or 
  
    
      
        
          I
          
            3
          
        
      
    
    {\displaystyle I_{3}}
  . It can be understood as the eigenvalue of a charge operator.
The weak isospin conservation law relates the conservation of 
  
    
      
        
          T
          
            3
          
        
      
    
    {\displaystyle T_{3}}
  ; all weak interactions must preserve 
  
    
      
        
          T
          
            3
          
        
      
    
    {\displaystyle T_{3}}
  . It is also conserved by the electromagnetic, and strong interactions. However, one of the interactions is with the Higgs field. Since the Higgs field vacuum expectation value is nonzero, particles interact with this field all the time even in vacuum. This changes their weak isospin (and weak hypercharge). Only a specific combination of them, 
  
    
      
        Q
        =
        
          T
          
            3
          
        
        +
        
          
            
              1
              2
            
          
        
        
          Y
          
            
              W
            
          
        
      
    
    {\displaystyle Q=T_{3}+{\tfrac {1}{2}}Y_{\mathrm {W} }}
   (electric charge), is conserved. 
  
    
      
        
          T
          
            3
          
        
      
    
    {\displaystyle T_{3}}
   is more important than T and often the term "weak isospin" refers to the "3rd component of weak isospin".