Decay of W+ boson

malawi_glenn

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Hi I was wondering why the W+ boson is decaying into following quarks:

up + anti(down)

charm + anti(strange)

bot not:

up + anti(strange) [for example]

both electric charge and baryon number is conserved.

What am I missing? Is it the Cabibbo angle?
 

Meir Achuz

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I thought W^+ does -->u+sbar.
 

malawi_glenn

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I thought W^+ does -->u+sbar.
not according to my book, Povh "nuclei and particles.."

and it cant be because of the cabibbo mixing.. must ask someone at my university i guess =)
 
I thought W^+ does -->u+sbar.
No, it does not. W+ --> u + sbar would cause the W+ to have isospin-1/2, which it clearly cannot have. It can only have isospin-1 (for u + dbar) or isospin-0 with S=1, C=1 (for c + sbar). Similarly, Z can only have isospin-0 or 1, with only quark-antiquark pairs forming in decay products.
 
Last edited:

malawi_glenn

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But those isospinn is not conserved in weak interaction, right?
 
W could decay to us,cd. but compare to ud,cs, it's rate is small. W->us,cd rates are around 1.7%. but to ud,cs,the rates around 32%. you could find the difference in CKM.
 

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