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a0+(980)-resonance production in pp->dK+Kbar0 reactions close to threshold

V. Kleber·M. Buescher·V. Chernyshev·S. Dymov·P. Fedorets·V. Grishina·C. Hanhart·M. Ha rtmann·V. Hejny·A. Khoukaz·H. R. Koch·V. Komarov·L. Kondratyuk·V. Koptev·N. Lang·S. Me rzliakov·S. Mikirtychiants·M. Nekipelov·H. Ohm·A. Petrus·D. Prasuhn·R. Schleichert·A. Sibirtsev·H. J. Stein·H. Stroeher·K. -H. Watzlawik·P. Wuestner·S. Yaschenko·B. Zali khanov·I. Zychor
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Abstract

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.

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V. Kleber, M. Buescher, V. Chernyshev, S. Dymov, P. Fedorets, V. Grishina, C. Hanhart, M. Ha rtmann, V. Hejny, A. Khoukaz, H. R. Koch, V. Komarov, L. Kondratyuk, V. Koptev, N. Lang, S. Me rzliakov, S. Mikirtychiants, M. Nekipelov, H. Ohm, A. Petrus, D. Prasuhn, R. Schleichert, A. Sibirtsev, H. J. Stein, H. Stroeher, K. -H. Watzlawik, P. Wuestner, S. Yaschenko, B. Zali khanov, I. Zychor. 2003-10-06. a0+(980)-resonance production in pp->dK+Kbar0 reactions close to threshold. https://doi.org/10.1103/physrevlett.91.172304

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