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The lifetime of a particle is given by the inverse of its decay rate, Γ, the probability per unit time that the particle will decay. For a particle of a mass M and four-momentum P decaying into particles with momenta p i, the differential decay rate is given by the general formula (expressing Fermi's golden rule) = | | (;,, …,)
Decay time of muons: The time dilation formula is = , where T 0 is the proper time of a clock comoving with the muon, corresponding with the mean decay time of the muon in its proper frame. As the muon is at rest in S′, we have γ=1 and its proper time T′ 0 is measured.
The decay constant, λ "lambda", the reciprocal of the mean lifetime (in s −1), sometimes referred to as simply decay rate. The mean lifetime, τ "tau", the average lifetime (1/e life) of a radioactive particle before decay. Although these are constants, they are associated with the statistical behavior of populations of atoms. In consequence ...
decaying after a mean lifetime of 26.033 nanoseconds (2.6033 × 10 −8 seconds), and the neutral pion π 0 decaying after a much shorter lifetime of 85 attoseconds (8.5 × 10 −17 seconds). [1] Charged pions most often decay into muons and muon neutrinos, while neutral pions generally decay into gamma rays.
), as described above, and it has a higher mass, a different decay state, and a shorter lifetime. Fundamentally, it results from the direct sum decomposition of the approximate SU(3) flavor symmetry among the 3 lightest quarks, 3 × 3 ¯ = 1 + 8 {\displaystyle \mathbb {3} \times {\bar {\mathbb {3} }}=\mathbb {1} +\mathbb {8} } , where 1 ...
D mesons Particle name Particle symbol Antiparticle symbol Quark content [4] Rest mass (MeV/c 2) I J P S C B' Mean lifetime () Commonly decays to (>5% of decays) Charged D meson [5]
In particle physics, proton decay is a hypothetical form of particle decay in which the proton decays into lighter subatomic particles, such as a neutral pion and a positron. [1] The proton decay hypothesis was first formulated by Andrei Sakharov in 1967. Despite significant experimental effort, proton decay has never been observed.
S ("K-short"), decays primarily into two pions, and has a mean lifetime 8.958 × 10 −11 s. Quark structure of the antikaon (K −). (See discussion of neutral kaon mixing below.) An experimental observation made in 1964 that K-longs rarely decay into two pions was the discovery of CP violation (see below). Main decay modes for K +: