There are particles much smaller than the known?
Responses (1)
Depends how you define a particle. Strictly speaking a particle is defined as something that has mass, on that basis the smallest particle would be the neutrino (electron, muon or tau).
If you mean the smallest possibble thing then, under current subatomic theory, that would be the plank length (1.6 x 10^-35 meters) which is the length of a superstring or a singularity or a grain (granular universal theory) depending on which theory you want to go with. The plank length is is thought to represent the theoretical limit of the shortest measureable length.