B Meson

B Meson

B mesons are mesons composed of a bottom antiquark and either an up (B+), down (B0), strange (B0
s) or charm quark (B+
c). The combination of a bottom antiquark and a top quark is not thought to be possible because of the top quark's short lifetime. The combination of a bottom antiquark and a bottom quark is not a B meson, but rather bottomonium.

Each B meson has an antiparticle that is composed of a bottom quark and an up (B−), down (B0), strange (B0
s) or charm antiquark (B−
c) respectively.