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These are all available for sale! Just email me: particle @ particlezoo.net.
If you don't see the particle you would like on the site, let me know. Custom particles require extra research time and a $10.00 setup fee.

Neutralino
A plush neutralino was taken aboard Discovery flight STS-128 with astronaut Christer Fuglesang in August 2009. More...

B Mesons
All four to choose from. More...

M1-3 Neutrinos
Neutrino researchers at Fermilab requested a set of 3 flavor-mixed neutrinos, M1, M2 and M3. These are available for sale here.

Big top quark reverses to a big bottom quark with mini antimuon and mini muon-neutrino
Custom particle for Fermilab. See more views

Strange bottom meson with mini strange/antistrange quark, bottom/antibottom quark and gluon.
Custom particle for Fermilab.

Hagen boson
Professor Carl Richard Hagen is noted as the co-discoverer of the Higgs mechanism and Higgs boson. A member of the family requested a special edition Higgs with a Hagen label.

Pomeron
The client's father studied pomerons and requested one as a gift. From the info tag:
The POMERON is a hypothetical particle named in 1961 after the Russian physicist Isaak Pomeranchuk. Carrying no charge and thought to have spin 2, the dynamic pomeron is related to our understanding of quantum chromodynamics (QCD) and is currently thought of more as “pomeron behaviour” than an actual particle candidate. It may actually be composed of glueballs.