21. Due to the top quark 's shortlifetime, the theta meson is not expected to be observed in nature. 22. Early searches for the top quark at SLAC and DESY ( in Hamburg ) came up empty-handed. 23. One of the main difficulties in identifying the top quark is that it cannot be seen directly. 24. :The top quark does not form baryons, according to our article, because its lifetime is too short. 25. The top quark is too heavy to form a similar meson, due to its very fast decay. 26. I don't think I had ever even heard of quarks, let alone missed the very top quark . 27. "' Ann Heinson "'is an American particle physicist known for her work on single top quark physics. 28. One could also conclude from this that the unknown sixth quark-the top quark -had to possess a huge mass. 29. The properties of the top quark , discovered at Fermilab in 1995, have so far only been measured approximately. 30. Dr . August's is top quark .
