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...

^{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...

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...

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...

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...

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...

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...

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...

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...

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...

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

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...

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...

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...

(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...

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...

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...

(constituent) mass of quarks, (iii) larger baryon masses, (iv) modified pion decay constant, etc. Recently, there was an increased activity to cross-check the...

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...

[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...

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...

with a field of several tesla. If the pion momentum is not too high, a large fraction of the pions will have decayed before they reach the end of the solenoid...

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

particle in a radiator with n {\displaystyle n} =1.0005 is shown in Fig.2; both pion and kaon are illustrated; protons are below Cherenkov threshold, c / n v...