The LHCb collaboration at CERN publishes a paper in Physical Review Letters on the first observation of matter-antimatter asymmetry in the decays of the particle known as the B⁰_s. It has a significance of more than 5 sigma, and is only the fourth subatomic particle known to exhibit such behaviour. 

By studying subtle differences in the behaviour of particle and antiparticles, experiments at the LHC are seeking to cast light on this dominance of matter over antimatter.

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