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Decay of W+ boson

  1. May 6, 2007 #1

    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?
     
  2. jcsd
  3. May 7, 2007 #2

    Meir Achuz

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    I thought W^+ does -->u+sbar.
     
  4. May 8, 2007 #3

    malawi_glenn

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    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 =)
     
  5. May 8, 2007 #4
    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: May 8, 2007
  6. May 8, 2007 #5

    malawi_glenn

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    But those isospinn is not conserved in weak interaction, right?
     
  7. May 8, 2007 #6
    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.
     
  8. May 8, 2007 #7
    Ummm... yes this is correct.
     
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