Abstract
Time reversal (T) symmetry has long been a subject of interest from pre-modern physics times, since it implies the reversibility of motion – for instance, an identical trajectory of an object when time runs back in classical mechanics. In modern quantum field theories it has received renewed attention as a discrete symmetry of space/time along with charge conjugation (C) and parity reflection (P) [1]. Although C and P are each maximally violated in weak interactions, T (and CP) is almost exact symmetry in all the interactions including the weak interaction. The violation of T would have a great impact [2] since it would mean that the physics laws in the time-reversed world are different from ours. T violation has also an important meaning in particle physics since it is equivalent to CP violation according to the CPT theorem. We can study the sources of CP violation which are necessary to explain the baryon asymmetry in the universe.
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The author would like to thank all the members of the TREK collaboration for valuable discussions. He would also like to acknowledge the discussions with the J-PARC hadron facility group on the beamline.
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Imazato, J. (2009). Search for T Violation in K+ → p0µ+ν Decays. In: Sato, T., Takahashi, T., Yoshimura, K. (eds) Particle and Nuclear Physics at J-PARC. Lecture Notes in Physics, vol 781. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-00961-7_4
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