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...

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...

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;...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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

{\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...

of how a basic property of the free neutron beta decay is modified in the nuclear environment by a pion effect, and the explanation of the characteristic...

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...

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

charged pions. The neutral pions decay almost immediately (with a lifetime of 85 attoseconds) into high-energy photons, but the charged pions decay more...

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

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

short-lived charged pions, which soon decay to muons, a primary type of cosmic ray radiation that reaches the surface of the earth. Pions can also be produced...

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...

fine structure constant and the electron mass). The best-known example of an effective field theory is the Fermi theory of beta decay. This theory was...