# Feynman diagaram of Kaon decay

1. Dec 20, 2012

### zardiac

1. The problem statement, all variables and given/known data
I am asked to draw a feynman diagram of $K^- \rightarrow \mu \nu$

2. Relevant equations
$K^-$ consist of $s\bar{u}$

3. The attempt at a solution
I wonder what the direcion of the arrows should be, my guess is something like the attached image.
edit: Ah, where the left u shoudl be an s and the right u should be an antiup. (attached the wrong pic)

#### Attached Files:

• ###### Kaondecay.png
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2. Dec 21, 2012

### vela

Staff Emeritus
That decay can't happen, can it? Doesn't it violate lepton number conservation?