How can a truly elementary particle decay into other particles?
123657
Why do physicists think that the electron is an elementary particle?
54968
Confusion about Length Contraction (ex in Muon decay)
80719
What defines the mass of elementary particle?
107918
How does an ordinary object become radioactive?
24463
How is it possible that quantum phenomenons (e.g. superposition) are possible when all quantum particles are being constantly observed?
95368
Is it possible for more than two particles to be entangled in a quantum way?
82492
How does a photon released from particle A interacting with particle B, entangle them?
12433
How do $\pi^0$ particles exist?
28165
Why can't a single photon produce an electron-positron pair?
72287
How does gamma-gamma pair production really work?
104852
Why can't a spin-1 particle decay into two identical spin-0 particles?
56776
How close does a particle-antiparticle pair need to be for annihilation to happen?
13683
How is $J^{PC}$ value experimentally determined for new types of particles?
71888
Practically, how does an 'observer' collapse a wave function?
70779
4-Momentum conservation for particle annihilation
155300
Angular momentum conservation in pion decay?
7909
What is spin as it relates to subatomic particles?