antibottom
Antibottom refers to the antiparticle of the bottom quark, denoted b̄. Like the bottom quark, the antibottom carries spin 1/2 and participates in the strong, weak, and electromagnetic interactions, but its quantum numbers are opposite in certain respects. The electric charge of the antibottom is +1/3 e (opposite to the bottom quark’s −1/3 e). Its mass is effectively the same as that of the bottom quark, with a value around 4.18 GeV/c^2 in common schemes. In quantum chromodynamics, the antibottom also carries anti-color charge, reflecting its status as an antiparticle of a colored quark.
In bound states, antibottom quarks appear primarily in mesons when paired with light quarks. Examples include
Production and decay: antibottom quarks are produced in high-energy collisions alongside bottom quarks, forming bb̄ pairs
Significance: studying systems with antibottom quarks, especially B mesons and anti-b baryons, provides insight into CP