DZero experiment discovers Omega-sub-b particle

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icho100
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DZero experiment at the U.S. Department of Energy's Fermi National Accelerator Laboratory have discovered a new particle made of three quarks, the Omega-sub-b (Ωb).

Read more about the 'Doubly Strange' Particle.
 

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<arXiv:0810.2050>
 
This is not my field, but I'm surprised that they haven't seen pretty much all combinations of the known quarks (with the exception of the top, which was first observed relatively recently). What has prevented this ... energy available in the collider, or some other technical issues?

p.s.
Welcome to PF, icho100.
 
Energy, background, rapid decay (too broad a width), time, money, other things to look for,
and other technical issues.