Stability of Unstable Particles at High Energies: Third Generation

[a dull boy]

Are particles that are not stable (for example top, bottom quarks; W and Z) when
produced in particle colliders possibly stable at very high energies? Are third generation particles stable at high energies?
Thanks, Mark

 

[fzero]

Are particles that are not stable (for example top, bottom quarks; W and Z) when
produced in particle colliders possibly stable at very high energies? Are third generation particles stable at high energies?
Thanks, Mark

No, unstable particles will eventually decay no matter what their energy. Due to relativistic time dilation, a higher energy particle will tend to have a longer lifetime as measured in the laboratory frame, but will nevertheless eventually decay. The measured lifetimes reported in the literature refer that in the rest frame of the particle.