In particle physics, the pion decay constant is the square root of the coefficient in front of the kinetic term for the pion in the low-energy effective...

meson. Pions are the lightest mesons and, more generally, the lightest hadrons. They are unstable, with the charged pions π+ and π− decaying after a...

N, respectively. The symbol f π denotes the free-space pion decay constant. (Decay constants have a "running time" and a "pole time" similar to the "running...

^{0}\end{pmatrix}}\right\}} where F {\displaystyle F} is called the pion decay constant which is 93 MeV. In general, different choices of the normalization...

factor of f π {\displaystyle f_{\pi }} being the pion decay constant. (In 1 + 1 dimensions, this constant is not dimensional and can thus be absorbed into...

the upper atmosphere, pions are created. These decay within a relatively short distance (meters) into muons (their preferred decay product), and muon neutrinos...

anomaly, with the axion mass roughly given in terms of the pion mass and pion decay constant as m a ≈ f π m π / f a {\displaystyle m_{a}\approx f_{\pi...

hadronic tau decays are: 25.49% for decay into a charged pion, a neutral pion, and a tau neutrino; 10.82% for decay into a charged pion and a tau neutrino;...

invariant under common S U ( 3 ) {\displaystyle SU(3)} rotations. The pion decay constant, fπ ≈ 93 MeV , may be viewed as the measure of the strength of the...

relates the pion-nucleon interaction to pion decay, fixing g A ≈ 1.267 {\displaystyle g_{A}\approx 1.267} as the axial coupling constant. The Goldberger–Treiman...

example, a neutral pion decays electromagnetically, and so has a life of only about 10−16 seconds. In contrast, a charged pion can only decay through the weak...

anomalous decay rate of the neutral pion, as computed in the current algebra of the chiral model. These calculations suggested that the decay of the pion was...

{\displaystyle {\boldsymbol {\pi }}^{2}+\sigma ^{2}=F^{2}\ ,} with F a pion decay constant with dimension = mass. Utilizing this to eliminate σ yields the following...

suppressed decay is the Phi meson into pions: φ → π+ + π− + π0 . It would be expected that this decay mode would dominate over other decay modes such...

the Planck constant. Thus, the lifetime of a particle is the direct inverse of the particle's resonance width. For example, the charged pion has the second-longest...

(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...

decaying into muons. 60% of the pions will have either a negative, or a positive electric charge. 40% of the pions will be neutral. The neutral pions...

Δ baryons with mass near 1232 MeV quickly decay via the strong interaction into a nucleon (proton or neutron) and a pion of appropriate charge. The relative...

demonstrated that the pion has negative parity. They studied the decay of an "atom" made from a deuteron (2 1H+ ) and a negatively charged pion (π− ) in a state...

In particle physics, particle decay is the spontaneous process of one unstable subatomic particle transforming into multiple other particles. The particles...

elements for the nucleon. On the other hand, the pion-nucleon coupling is a phenomenological constant describing the (strong) scattering of bound states...

6×1033 years for decay to an antimuon and a neutral pion, and 8.2×1033 years for decay to a positron and a neutral pion. Another experiment at the Sudbury Neutrino...

collisions of cosmic rays are supposed to produce charged pions, whose decay give the neutrinos, neutral pions, and gamma rays the environment of a supernova remnant...

decay via the weak force without emitting a pion; this process becomes dominant in heavy hypernuclei, due to suppression of the pion-emitting decay mode...

description of the Yukawa potential, an early example of a nuclear potential. Pions, fulfilling the prediction, were discovered experimentally in 1947. By the...

axial coupling constant in beta-decay, pion scattering, axial locality, pion condensation in nuclear matter, structure of the nuclear pion field, etc. Spin...

hadronic shower component that produces shower particles mostly through pion decay. Primary photons and electrons, on the other hand, produce mainly electromagnetic...

nonlinear SU(2) pion field. The topological stability of the skyrmion is interpreted as the conservation of baryon number, that is, the non-decay of the nucleon...

needs to be taken into account. (For example, in the decay of the rho meson into a pair of pions.) The factor of M2 that multiplies Γ2 should also be...

[emphasis in original] The statement excludes spin-0 mesons, such as the pion, since they are known to be composites of pairs of spin-⁠ 1 /2⁠ fermions...