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one of the four known fundamental forces of nature and the one responsible for beta-decay radioactivity. The weak interaction is very short-ranged and more weakly coupled than either the strong nuclear force or electromagnetism. At energy scales above the Z mass the weak and electromagnetic interactions are unified (that is subject to a unified mathematical treatment).

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Weak force is not required to keep electrons confined in atomic orbitals. For that, electromagnetism is sufficient. The weak force is different from electrostatic, and this is evident from the fact t …
answered Apr 18 '17 by Salvatore Baldino
2
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Those two things are related, but different. Your equation $(10.92)$ indicates the value of a vertex, while $\mathcal T$ in Srednicki's book represents an amplitude. Basically, the vertex is one of …
answered Apr 21 '17 by Salvatore Baldino