Time's quantum arrow has a preferred direction: BaBar experiment confirms time asymmetry

In this illustration, two different B mesons are changing between states (represented as colors); however blue-B changes into red-B more quickly than red-B changes into blue-B (a process running in reverse-time, as shown by the backwards clock dial). For these transformations, time has proven asymmetrical; the changes are happening at a different rate as time moves forward than when it is reversed, according to measurements from the high-energy physics experiment known as BaBar. Credit: Greg Stewart, SLAC National Accelerator Laboratory (Phys.org)—Time marches relentlessly forward for you and me; watch a movie in reverse, and you'll quickly see something is amiss. But from the point of view of a single, isolated particle, the passage of time looks the same in either direction. For instance, a movie of two particles scattering off of each other would look just as sensible in reverse – a concept known as time reversal symmetry.

Read more at: http://phys.org/news/2012-11-quantum-arrow-babar-asymmetry.html#jCp