News of the WeekPhysics

Particle Decays Reveal Arrow of Time

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Science  23 Oct 1998:
Vol. 282, Issue 5389, pp. 602-603
DOI: 10.1126/science.282.5389.602

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The microscopic level where particles collide and decay has seemed indifferent to the direction of time. But two groups of researchers have now directly detected the forward march of time in the decays of subatomic particles by measuring the rate of a particular decay and showing that it differs from the rate of the same process done in reverse.