The First Discovered Time-Reversal Violation: BABAR Collaboration

1. The First Discovered Time-Reversal Violation:BABAR Collaboration BABAR Collaboration: The BABAR detector was designed to measure the collisions between electrons and positrons. This was to answer questions about the differences between matter and antimatter. However is was shut down in April 2008. Since then analysis of the data has continued. T-symmetry: In the theoretical physics, T-symmetry is the theoretical symmetry of physical laws under a time reversal transformation. It is noted that the observable universe does not show this symmetry under time reversal, primarily due to the second law of thermodynamics. Charge, Parity, and Time: A fundamental symmetry of the universe is the idea that relation between charge, parity, and time stays the same. However it is noted that when using weak forces, these individual symmetries have been broken. It was expected that these systems would show these asymmetries when time was reversed. The BABAR detector are tuned to just the right energy for producing Y(4s) mesons, these decay into B meson.These B mesons were quantum entangled and the scientists carefully chose one each of these mesons decayed into. Checking the initial and final states of the transformations the physicists found a difference in the rates for the transfermation. BABAR detector