I'm just being introduced to particle physics and wondering if I'm going about this correct..can someone help me? thanks The measured width of the J/ψ meson is 88 keV. Estimate its lifetime. Lifetime (s) of J/ψ meson is 8E-21 s Using uncertainty principle: ΔE = h/2πΔt isolate for delta t? 8E-21s – 5E-22s = 7.5E-21 s ?