They are looking in particular at how long it takes a B-meson to change its nature, focusing on one particular member of the extended B-meson family, the electrically neutral B0.
ECONOMIST: The arrow of time
B-meson, as the abbreviation suggests, is any meson that contains a bottom (or an antibottom) quark.
ECONOMIST: What��s the matter?
B-meson travelled before it broke down, and thus how long it lasted.
ECONOMIST: How to build a B-factory
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