590
10 Particle Physics – II
Since f = f , we conclude that some of the K S -state has regenerated. The
regeneration of the short lived K 1 -component in a long-lived K L beam was
experimentally confirmed from observation of two-pion decay mode (1956).
10.3.6 Electro-weak Interactions
10.93
Fig. 10.13(a)
ν μ +e – →z 0 →ν μ +e –
A charged current weak interaction is mediated by the exchange of W
±
boson, as for the decay μ
−
→ e
−
+ ν e + ν μ . Neutral current interaction
is mediated by the exchange of Z
0 , as in the scattering, ν μ + p → ν μ + p.
For ν μ + e
−
→ ν μ + e
− , the Feynman diagram for weak neutral current
shown in Fig. 10.13a is unambiguous.
ν e +e – →z 0 →ν e +e –
ν e +e – →w →ν e +e –
Fig. 10.13(b), (c)
10 Particle Physics – II
Since f = f , we conclude that some of the K S -state has regenerated. The
regeneration of the short lived K 1 -component in a long-lived K L beam was
experimentally confirmed from observation of two-pion decay mode (1956).
10.3.6 Electro-weak Interactions
10.93
Fig. 10.13(a)
ν μ +e – →z 0 →ν μ +e –
A charged current weak interaction is mediated by the exchange of W
±
boson, as for the decay μ
−
→ e
−
+ ν e + ν μ . Neutral current interaction
is mediated by the exchange of Z
0 , as in the scattering, ν μ + p → ν μ + p.
For ν μ + e
−
→ ν μ + e
− , the Feynman diagram for weak neutral current
shown in Fig. 10.13a is unambiguous.
ν e +e – →z 0 →ν e +e –
ν e +e – →w →ν e +e –
Fig. 10.13(b), (c)