Question 19M.3.HL.TZ1.6a

The particle omega minus (${\mathrm{\Omega }}^{-}$) decays at rest into a neutral pion (${\pi }^0$) and the xi baryon (${\mathrm{\Xi }}^{-}$) according to

^{$${\mathrm{\Omega }}^{-}\to {\pi }^0+{\mathrm{\Xi }}^{-}$$}

The pion momentum is 289.7 MeV c^–1.

The rest masses of the particles are:

${\mathrm{\Omega }}^{-}$: 1672 MeV c^–2

${\pi }^0$: 135.0 MeV c^–2

${\mathrm{\Xi }}^{-}$: 1321 MeV c^–2