New data on coherent K −d interactions at 12 GeV/ c

Abstract

The coherent deuteron reactions K −d → K − π + π −d and K −d → K 0 π − π 0d have been studied at 12 GeV/ c in the SLAC 82 inch deuterium bubble chamber. The cross section for the first reaction is 312 ± 30 μb and for the second 270 ± 50 μb. Resonance signals or enhancements observed are K 890 ∗, K 1420 ∗, d ∗, and Q; no clear L-meson signal is seen. In the K ππ system, components with spin ⩾ 2 only occur in events with d ∗ production. Helicities in the s-and t-channels are not conserved in K ππ production.