a+0 (980)-resonance production in pp-->dK+K-0 reactions close to threshold.

The reaction pp → dK + K 0 has been investigated at an excess energy of Q = 46 MeV above the K + K 0 threshold with ANKE at the cooler synchrotron COSY-Julich. From the detected coincident dK + pairs, about 1000 events with a missing K 0 were identified, corresponding to a total cross section of σ(pp → dK + K 0 ) = [38 ′ 2(stat) ′ 14(syst)] nb. Invariant-mass and angular distributions have been jointly analyzed and reveal s-wave dominance between the two kaons, accompanied by a p wave between the deuteron and the kaon system. This is interpreted in terms of a + 0(980)-resonance production.