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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.
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.
Meson (/ ˈ m ɛ. s ɒ n /) [2] is a software build automation tool for building a codebase. Meson adopts a convention over configuration approach to minimize the data required to configure the most common operations. [ 3 ]
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 1950, 30 charged and 4 neutral "V-particles" were reported. Inspired by this, numerous mountaintop observations were made over the next several years, and by 1953, the following terminology was being used: "L meson" for either a muon or charged pion; "K meson" meant a particle intermediate in mass between the pion and nucleon.
The η′ meson (η′) is a flavor SU(3) singlet, unlike the η. It is a different superposition of the same quarks as the eta meson (η), as described above, and it has a higher mass, a different decay state, and a shorter lifetime.
meson, with a significance of over five standard deviations. [13] The results of a subsequent data analysis by the same collaboration was presented in 2022, which announced that they found evidence of direct CP violation in the decay of the D 0 meson into pions. [14]
Like all particle states, exotic mesons are specified by the quantum numbers which label representations of the Poincaré symmetry, q.e., by the mass (enclosed in parentheses), and by J PC, where J is the angular momentum, P is the intrinsic parity, and C is the charge conjugation parity; One also often specifies the isospin I of the meson.