(a) Below are shown various vertices coupling gauge bosons (2.e. force carying particles) into pairs of fermions. Identify which vertices are forbidden and give a reason why. Where possible, for these cases, show the allowed diagram by changing the identify of the bottom fermion. (i) (ii) et (ii) и Z www e- (iv) (v) Vu (vi) e W www Ve Ve
(a) Below are shown various vertices coupling gauge bosons (2.e. force carying particles) into pairs of fermions. Identify which vertices are forbidden and give a reason why. Where possible, for these cases, show the allowed diagram by changing the identify of the bottom fermion. (i) (ii) et (ii) и Z www e- (iv) (v) Vu (vi) e W www Ve Ve
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Transcribed Image Text:(a) Below are shown various vertices coupling gauge bosons (i.e. force carying particles) into pairs of
fermions. Identify which vertices are forbidden and give a reason why. Where possible, for these cases,
show the allowed diagram by changing the identify of the bottom fermion.
(i)
e+ (ii)
(ii)
и
wwwz
ū
e-
(iv)
(v)
(vi)
e-
Ve
Ve
(vii)
(viii)
d
(ix)
u
и
ū
(b) Draw Feynman diagrams for the following weak decays or processes. Do this at quark level for
those involving hadrons.
i. K° → T +e+ +ves
ii. D+ → KO +µt + Vp,
iii. 7+ + n+ + Ur;
iv. A° → p+e +ve;
v. E- → A° + ;
vi. K+ → n+ + +,
vii. Bộ → Bộ.
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