latentcorpse
Mar29-10, 05:03 PM
justify which interactions is involved in each of the following:
\pi^0 \rightarrow \gamma \gamma
\pi^+ \rightarrow \mu^+ \nu_\mu
\pi^- p \rightarrow \triangle (1232) \rightarrow \pi^0 n
K^0 \rightarrow \pi^+ \pi^-
ok the first one i ruled out strong force since particles on right dont have colour charge. i ruled out weak netural currecnt (Z boson) interaction since fermion flavour isn't conserved. so its between weak charged current ( W^{\pm} boson) or electromagnetic). i think it's probably W boson since photons don't have charge so you can't have a vertex on the Feynman diagram with three photons meeting. is this right?
for the second one, i ruled out strong force and Z boson for same reasons as above. this time, seeing as they are charged, i don't know how to decide between W boson or electromagnetic? any ideas?
i have no clue for the third one since i don't know what \triangle (1232) is.
the fourth one im not sure about either but i have the feeling its a weak interaction. posisbly a W boson since the fermion flavour does change. but im not sure whether its W+ or W- or how to rule out the strong and electromagnetic interactions.
thanks.
\pi^0 \rightarrow \gamma \gamma
\pi^+ \rightarrow \mu^+ \nu_\mu
\pi^- p \rightarrow \triangle (1232) \rightarrow \pi^0 n
K^0 \rightarrow \pi^+ \pi^-
ok the first one i ruled out strong force since particles on right dont have colour charge. i ruled out weak netural currecnt (Z boson) interaction since fermion flavour isn't conserved. so its between weak charged current ( W^{\pm} boson) or electromagnetic). i think it's probably W boson since photons don't have charge so you can't have a vertex on the Feynman diagram with three photons meeting. is this right?
for the second one, i ruled out strong force and Z boson for same reasons as above. this time, seeing as they are charged, i don't know how to decide between W boson or electromagnetic? any ideas?
i have no clue for the third one since i don't know what \triangle (1232) is.
the fourth one im not sure about either but i have the feeling its a weak interaction. posisbly a W boson since the fermion flavour does change. but im not sure whether its W+ or W- or how to rule out the strong and electromagnetic interactions.
thanks.