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Quark composition of Neutral Antikaon?

  • #1
I need to determine the quark composition of the neutral antikaon. Below is a copy of my multiple choice question.

http://img166.imageshack.us/img166/2025/quarksec1.jpg [Broken]

Here is my attempt at a solution:

First, a neutral antikaon is a meson. This means it must be composed of a quark-antiquark pair. A neutral antikaon has charge of 0 and strangeness of -1. From the six known quarks, the composition must be a strange quark and an antidown quark.

I tried selecting [tex]s \bar{d}[/tex] but that is incorrect. How?

For a table of needed quark properties, see http://hyperphysics.phy-astr.gsu.edu/hbase/Particles/quark.html" [Broken]
 
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