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Three antiquarks of different anticolors, giving an antibaryon with baryon number −1. The baryon number was defined long before the quark model was established, so rather than changing the definitions, particle physicists simply gave quarks one third the baryon number. Nowadays it might be more accurate to speak of the conservation of quark ...
Mesons named with the letter "f" are scalar mesons (as opposed to a pseudo-scalar meson), and mesons named with the letter "a" are axial-vector mesons (as opposed to an ordinary vector meson) a.k.a. an isoscalar vector meson, while the letters "b" and "h" refer to axial-vector mesons with positive parity, negative C-parity, and quantum numbers I G of 1 + and 0 − respectively.
Because quarks have a spin 1 / 2 , the difference in quark number between mesons and baryons results in conventional two-quark mesons being bosons, whereas baryons are fermions. Each type of meson has a corresponding antiparticle (antimeson) in which quarks are replaced by their corresponding antiquarks and vice versa.
The best known baryons are protons and neutrons, which make up most of the mass of the visible matter in the universe, whereas electrons, the other major component of atoms, are leptons. Each baryon has a corresponding antiparticle , known as an antibaryon, in which quarks are replaced by their corresponding antiquarks.
Mesons are made of a valence quark–antiquark pair (thus have a baryon number of 0), while baryons are made of three quarks (thus have a baryon number of 1). This article discusses the quark model for the up, down, and strange flavors of quark (which form an approximate flavor SU(3) symmetry). There are generalizations to larger number of flavors.
Too much technical gibber and not enough thought. There need to be four K mesons, two neutrally charged and one + and one -, all with approximate mass 892.2 Mev corresponding to Strangeness +1 and Strangeness -1 multiplied by isospin +1/2 and -1/2. Elsewhere in Wickipedia you have the correct hexagonal diagram for vector mesons --- check it up.
Omega baryons containing top quarks are also not expected to be observed. This is because the Standard Model predicts the mean lifetime of top quarks to be roughly 5 × 10 −25 s , [ 2 ] which is about a twentieth of the timescale necessary for the strong interactions required for Hadronization , the process by which hadrons form from quarks ...
Pions are the lightest mesons and, more generally, the lightest hadrons. They are unstable, with the charged pions π + and π − decaying after a mean lifetime of 26.033 nanoseconds (2.6033 × 10 −8 seconds), and the neutral pion π 0 decaying after a much shorter lifetime of 85 attoseconds (8.5 × 10 −17 seconds). [1]