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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 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 ...
Protons and neutrons (which make the majority of the mass of an atom) are examples of baryons; pions are an example of a meson. A tetraquark state (an exotic meson), named the Z(4430) −, was discovered in 2007 by the Belle Collaboration [2] and confirmed as a resonance in 2014 by the LHCb collaboration. [3] Two pentaquark states (exotic ...