Observation of ϱ− meson with a missing-mass spectrometer operating in region of “Jacobian peaks”

Non-strange neutral meson spectrum from π^-p → M°n at 2.4 GeV/c

“…Using t h i s technique, the non-st range .charged meson spectrum has been studied e x t e n s i & l y I n ' t h e reactiqn n-p + p + . missing mass (MM) (2)(3)(4)9,(11)(12)(13) as w e l l as I n processes such as p+p +'…”