T mesons are mesons composed of a bottomquark and either an up ( T0 ), down ( T+ ), strange ( T+ s) or charmquark ( T0 c).[1] Because of the top quark's short lifetime, T mesons are not expected to be found in nature. The combination of a top quark and top antiquark is not a T meson, but rather toponium. Each T meson has an antiparticle that is composed of a top antiquark and an up ( T0 ), down ( T− ), strange ( T− s) or charm quark ( T0 c) respectively.
