Antiproton-proton annihilation at rest into Kappa(O)(L)Kappa(+/-)pi(-/+)pi(O) - manifestations of isospin interference

摘要

The decay (p) over bar p (at rest) --> K(L)(o)K(+/-)pi(+/-)pi(o), studied on a sample of more than 14000 events, is found to proceed dominantly via two-body channels containing resonances with open strangeness. Contributions from K-1(1270)(K) over bar and K-1(1400)(K) over bar, branching into the successive K-1-decay modes, and from K*(K) over bar*, K*((K) over bar pi)(S) and (K pi)(S)((K) over bar pi)(S) are extracted by means of a partial-wave analysis which accounts well for the data and also allows a search for weak contributions from other (K pi pi) and from(K (K) over bar pi) resonances. Striking asymmetries between the charged and the neutral kaonic resonances give evidence for interfering isospin 0 and 1 annihilation amplitudes. (C) 1997 Published by Elsevier Science B.V.