The discussion revolves around the correlation between the size of matter particles, defined as their matter wavelength, and their mass. It highlights that the de Broglie wavelength, which relates to a particle's momentum, does not directly correlate with mass, as it depends on momentum rather than mass alone. Participants clarify that elementary particles like electrons are considered point-like and do not have a defined size. The conversation suggests that while there may be an indirect relationship between particle size and mass through momentum, the initial premise lacks a straightforward answer. Ultimately, the consensus leans toward the idea that there is no clear correlation between the size and mass of matter particles.