Weak hypercharge | Wikipedia audio article
Channel: wikipedia tts
Date: 08/12/2018

This is an audio version of the Wikipedia Article:
Weak hypercharge


00:01:14 1 Definition
00:03:24 2 Baryon and lepton number
00:04:17 2.1 Neutron decay
00:04:38 2.2 Proton decay
00:05:03 3 See also



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SUMMARY
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In the Standard Model of electroweak interactions of particle physics, the weak hypercharge is a quantum number relating the electric charge and the third component of weak isospin. It is frequently denoted YW and corresponds to the gauge symmetry U(1).It is conserved (only terms that are overall weak-hypercharge neutral are allowed in the Lagrangian). 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 hypercharge (and weak isospin T3). Only a specific combination of them, 
  
    
      
        Q
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          T
          
            3
          
        
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              1
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          Y
          
            
              W
            
          
        
      
    
    {\displaystyle Q=T_{3}+{\tfrac {1}{2}}Y_{\rm {W}}}
   (electric charge), is conserved.
Mathematically, weak hypercharge appears similar to the Gell-Mann–Nishijima formula for the hypercharge of strong interactions (which is not conserved in weak interactions) and which does not apply to leptons.