Particle Decay Calculator

Convert between lifetime (τ), decay length (cτ), and decay width (Γ) for particle physics calculations

Calculator

Input Quantity

Value

Output Quantity

Output Unit

Result

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Formula Used

τ = ℏ / Γ

Click a particle to load its lifetime value

Lifetime ↔ Decay Width

τ = ℏ / Γ

where ℏ = 6.582 × 10⁻²⁵ GeV·s

Lifetime ↔ Decay Length

cτ = c × τ

where c = 299,792,458 m/s

Lab Frame Decay Length

L = βγcτ

γ = E/m (Lorentz factor)

Speed of light (c) 299,792,458 m/s

ℏ (reduced Planck) 6.582 × 10⁻²⁵ GeV·s

ℏc 197.3 MeV·fm