Several New Cases Violating Time Reversal Symmetry In the Processes of   Particle Interactions
  It is pointed that we now actually have no enough proofs to prove that time reversal symmetry is universally obeyed in the processes of particle interactions. The analyses show that the time reversal symmetry is obviously violated at least in the decay processes of particles, especially in the decay processes of strange particles, and some resonance states with only one middle resonance particle to appear, as well as the annihilation processes of particle pairs. So the phenomena of violating time reversal symmetry may exist commonly in the interaction processes between particles. 
Mei Xiaochun