B-meson

…seen in the decay of B-mesons, particles that are heavier than K-mesons and thus able to account for more of the asymmetry.

…of particles known as B-mesons. In 2010, scientists at the Fermi National Accelerator Laboratory in Batavia, Illinois, finally detected a slight preference for B-mesons to decay into muons rather than anti-muons.

…of the particles known as B-mesons, which contain a bottom quark instead of the strange quark of the K-mesons. Experiments at facilities that can produce large numbers of the B-mesons (which are heavier than the K-mesons) are continuing to test these ideas. In 2010, scientists at the Fermi National Acclerator…

…detect a slight preference for B-mesons (particles that contain a bottom quark) to decay into muons rather than antimuons. This violation of charge symmetry could lead to an explanation for why there is more matter than antimatter in the universe.

…so new short-lived particles (specifically, B-mesons) are created in motion; this gives them an apparently longer lifetime in the laboratory owing to the effect of time dilation in the theory of special relativity.