A simple description of the JP = 1+K±π+π− system in the reactions K±p→K±π+π−p

Abstract A model in which Q 1 and Q 2 resonance contributions add coherently to a Gaussian background is shown to reproduce the mass dependence of the J P = 1 + K ∗ π and ϱK partial waves in K ± p→K ± π + π − at 13 GeV/ c . Through a fit to the data, the mass and total width for Q 1 are found to be m = 1289 ± 3 ± (25) MeV, Λ = 150 ± 9 (±70) MeV and for Q 2 , m = 1404 ± 3 (±10) MeV, Λ = 142 ± 4 (±15) MeV, where estimated systematic errors are given in parentheses. While a significant background is required for the 1 + K ∗ π system, none is needed for the 1 + ϱK system.