a+(0)(908) resonance production in pp ---> d K+ anti-K0 reactions close to threshold

The reaction pp->d K+ Kbar0 has been investigated at an excess energy of Q=46 MeV above the (K+ Kbar0) threshold with ANKE at COSY-Juelich. From the detected coincident dK+ pairs about 1000 events with a missing Kbar0 were identified, corresponding to a total cross section of sigma(pp->d K+ Kbar0)=(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 a0+(980)-resonance production.

Note:

4 pages, 4 figures: accepted by Phys. Rev. Lett

p p: inelastic scattering
deuteron: hadroproduction
K: pair production
a0(980): hadroproduction
a0(980): hadronic decay
mass spectrum: (anti-K0 K+)
angular distribution
magnetic spectrometer: experimental results
Juelich COSY PS
p p --> deuteron anti-K0 K+

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