Are there examples of particles with same size but different masses?
It can be rms radius charge or cross section. So are there examples of particles with similar ‘size’ but different masses?Elementary particles do not have a spatial extension in QFT. Size of a hadron one usually mean rms charged radius which in some way is analogous to how we can talk about "size" of an atom.
I think you either need to specify what you mean by size, or simply re-evaluate your concept of size in subatomic physics.
Cross section means reaction probability in particle physics :)It can be rms radius charge or cross section. So are there examples of particles with similar ‘size’ but different masses?
Sure about that?Plus/minus 10% there are no particles that have exactly the same mass except particle/anti particle pairs.
I forgot a "?" there, and a capital letter :) I was typing on my cell phone.Sure about that?
So the "plus/minus 10%?" I mean't how accurate the OP wanted "similar" to be.Plus/minus 10%? There are no particles that have exactly the same mass except particle/anti particle pairs.
Transition magnetic moments tells you this. The problem is that these are OK for B*'s but small for D*'s.There is no good way to measure this
No one has ever said that protons are point particles either. At least not here. And if they do, they are of course wrong. The proton is not an elementary particle. Did you think it is or what? Even if those radii were the same, proton would not be a pointparticle.So if mass size and charge size and scalar size are all different, a proton can't be a point particle.
These last posts remind me of the opening paragraph in Laughlin's Nobel Lecture.[...] Now, go and find for us the proof of neutrino size. Are you working on it?
By all means, enlighten us.These last posts remind me of the opening paragraph in Laughlin's Nobel Lecture.
Though not difficult to trace that Lecture, what I recalled was this (in Laughlin's own words):By all means, enlighten us.
Thanks a lot for the correction. Appreciated.