T meson
T mesons are hypothetical mesons composed of a top quark and either an up , down , strange or charm antiquark . 
<triplet> T meson <subj> meson <obj> subclass of <triplet> meson <subj> quark <obj> has parts of the class <triplet> top <subj> quark <obj> subclass of <triplet> up <subj> quark <obj> subclass of <triplet> strange <subj> quark <obj> subclass of <triplet> charm antiquark <subj> quark <obj> subclass of