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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.
The D mesons were discovered in 1976 by the Mark I detector at the Stanford Linear Accelerator Center. [3] Since the D mesons are the lightest mesons containing a single charm quark (or antiquark), they must change the charm (anti)quark into an (anti)quark of another type to decay. Such transitions involve a change of the internal charm quantum ...
Vector meson. The vector mesons consisting of light quarks form a nonet. In high energy physics, a vector meson is a meson with total spin 1 and odd parity (usually noted as JP = 1−). Vector mesons have been seen in experiments since the 1960s, and are well known for their spectroscopic pattern of masses. [1]
In particle physics, the phi meson or ϕ meson is a vector meson formed of a strange quark and a strange antiquark. It was the ϕ meson's unusual propensity to decay into K 0 and K0 that led to the discovery of the OZI rule. It has a mass of 1019.461±0.020 MeV/ c2 and a mean lifetime of 1.55±0.01 × 10−22s.
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 ...
η′. ) are isosinglet mesons made of a mixture of up, down and strange quarks and their antiquarks. The charmed eta meson (. η. c) and bottom eta meson (. η. b) are similar forms of quarkonium; they have the same spin and parity as the (light) η. defined, but are made of charm quarks and bottom quarks respectively.
0 ħ, 1 ħ. In particle physics, a meson (/ ˈmiːzɒn, ˈmɛzɒn /) is a type of hadronic subatomic particle composed of an equal number of quarks and antiquarks, usually one of each, bound together by the strong interaction. Because mesons are composed of quark subparticles, they have a meaningful physical size, a diameter of roughly one ...
The rare decays of the B s meson are an important test of the Standard Model. The branching fraction of the strange b-meson to a pair of muons is very precisely predicted with a value of Br (B s → μ + μ −) SM = (3.66 ± 0.23) × 10 −9. Any variation from this rate would indicate possible physics beyond the Standard Model, such as ...