Rare decay modes of K∗(1420) and K∗(892)

Abstract A 2.5 standard deviation signal is observed for the decay K ∗− (1420) → K ∗− (892)π + π − . From this signal a partial width of 13.0 ± 5.0 MeV for the decay mode K ∗ (1420)→ K ∗ (892)ππ is deduced under the assumption that the ππ system is in an I = 1 state. For the rare decay mode K ∗ (892)→ K ππ no signal is observed. The following upper limits can be given for the decay widths: Γ K ∗− (892) → K − π + π − keV , Γ K ∗− (892) → K 0 π − π 0 keV , Γ K ∗0 (892) → K 0 π + π − keV .