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I was using this applet: http://www.lon-capa.org/~mmp/applist/q/q.htm And I saw that the up, strange, strange quark combination formed this Baryon:

enter image description here

But the anti-up, anti-strange, anti-strange combination didn't form anything. So is that a fault of the applet or is there an actual reason? What would the reason be?

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The applet only shows the possible Baryons(three quark bound state). anti-up, anti-strange, anti-strange is an Anti-baryon of the corresponding Xi baryon. –  Hubble07 Jun 4 at 13:19
    
@Hubble07 the app does show anti baryons such as the anti-proton and anti-neutron, but doesn't show anti-Xi –  DavePhD Jun 4 at 14:57

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up vote 8 down vote accepted

That would be an anti-Xi baryon.

Production of Xi / anti-Xi pairs in discussed in Branching Fraction Measurements of psi(2S) Decay to Baryon-Antibaryon Final States.

So yes it does form something and it is a fault of the applet.

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technically the applet is right it is only designed to show particle not anti-particle –  Hubble07 Jun 4 at 13:24
    
@Hubble07 it shows other anti-baryons and has icons to click to select antiquarks –  DavePhD Jun 4 at 13:30

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