A meson containing a bottom quark or its antiquark partner. The neutral pair and undergoes neutral meson mixing.
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B mesons are a type of meson that contain a bottom quark (b quark) and an anti-quark. Mesons are subatomic particles made up of one quark and one antiquark, and they are part of the family of hadrons, which are particles affected by the strong force. B mesons come in several varieties, depending on the type of anti-quark they pair with the bottom quark.