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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.
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]
If the meson is not pseudoscalar (J P = 0 −) or vector (J P = 1 −), J is added as a subscript. When the spectroscopic state of the meson is known, it is added in parentheses. When the spectroscopic state is unknown, mass (in MeV/c 2) is added in parentheses. When the meson is in its ground state, nothing is added in parentheses.
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In high-energy physics, a pseudoscalar meson is a meson with total spin 0 and odd parity (usually notated as J P = 0 −). [1] [a] Pseudoscalar mesons are commonly seen in proton-proton scattering and proton-antiproton annihilation, and include the pion (π), kaon (K), eta (η), and eta prime (η ′) particles, whose masses are known with ...
After the pions and kaons, the rho mesons are the lightest strongly interacting particle, with a mass of 775.45 ± 0.04 MeV for all three states. [ c ] The rho mesons have a very short lifetime and their decay width is about 145 MeV with the peculiar feature that the decay widths are not described by a Breit–Wigner form.
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