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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.
Each type of meson has a corresponding antiparticle (antimeson) in which quarks are replaced by their corresponding antiquarks and vice versa. For example, a positive pion (π +) is made of one up quark and one down antiquark; and its corresponding antiparticle, the negative pion (π −), is made of one up antiquark and one down quark.
Examples of mesons include the pion, kaon, and the J/ψ. In quantum hadrodynamics , mesons mediate the residual strong force between nucleons. At one time or another, positive signatures have been reported for all of the following exotic mesons but their existences have yet to be confirmed.
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In high energy physics, a pseudovector meson or axial vector meson is a meson with total spin 1 and even parity (+) (usually noted as J P = 1 +). [ 1 ] [ 2 ] Compare to a vector meson , which has a total spin 1 and odd parity (that is, J P = 1 − ).
meson (a) and two π + mesons (b and c). The π − meson interacts with a nucleus in the emulsion at B. The π ± mesons have a mass of 139.6 MeV/c 2 and a mean lifetime of 2.6033 × 10 −8 s. They decay due to the weak interaction. The primary decay mode of a pion, with a branching fraction of 0.999877, is a leptonic decay into a muon and a ...
In high energy physics, a scalar meson is a meson with total spin 0 and even parity (usually noted as J P =0 +).In contrast, pseudoscalar mesons have odd parity. The first known scalar mesons have been observed since the late 1950s, with observations of numerous light states and heavier states proliferating since the 1980s.
T meson, hypothetical mesons composed of a top quark and one additional subatomic particle. Examples include the theta meson , formed by a top and an anti-top. Tachyons is a hypothetical particle that travels faster than the speed of light so they would paradoxically experience time in reverse (due to inversion of the theory of relativity ) and ...