They are thus baryons, with total isospin of 1, and can either be neutral or have an elementary charge of +2, +1, 0, or −1.
They are closely related to the lambda baryons, which differ only in the wavefunction's behaviour upon flavour exchange.
However, the top sigmas are expected to never be observed, since the Standard Model predicts the mean lifetime of top quarks to be roughly 5×10−25 s.[2] This is about 20 times shorter than the timescale for strong interactions, and therefore it does not form hadrons.
Antiparticles are not listed in the table; however, they simply would have all quarks changed to antiquarks (and vice versa), and Q, B, S, C, B′, T, would be of opposite signs.
I, J, and P values in red have not been firmly established by experiments, but are predicted by the quark model and are consistent with the measurements.