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Scalar-isovector K K-bar production close to threshold

A. Dzyuba·V. Kleber·M. Buescher·V. P. Chernyshev·S. Dymov·P. Fedorets·V. Grishina·C. Hanhart·M. Hartmann·V. Hejny·L. Kondratyuk·V. Koptev·P. Kulessa·Y. Maeda·T. Mersmann·S. Mikirtychyants·M. Nekipelov·D. Prasuhn·R. Schleichert·A. Sibirtsev·H. J. Stein·H. Stroeher·I. Zychor
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Abstract

The reaction pp -> d K^+ K^0-bar has been investigated at excess energies Q = 47.4 and 104.7 MeV above the K^+ K^0-bar threshold at COSY-Juelich. Coincident dK^+ pairs were detected with the ANKE spectrometer, and events with a missing K^0-bar invariant-mass subsequently identified. The joint analysis of invariant-mass and angular distributions reveals s-wave dominance between the two kaons, in conjunction with a p-wave between the deuteron and the kaon pair, i.e. K K-bar production via the a_0^+(980) channel. Integration of the differential distributions yields total cross sections of sigma(pp -> d K^+ K^0-bar) = (38 +/- 2(stat) +/- 14(syst)) nb and 190 +/- 4(stat) +/- 39(syst)) nb for the low and high Q values, respectively.

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A. Dzyuba, V. Kleber, M. Buescher, V. P. Chernyshev, S. Dymov, P. Fedorets, V. Grishina, C. Hanhart, M. Hartmann, V. Hejny, L. Kondratyuk, V. Koptev, P. Kulessa, Y. Maeda, T. Mersmann, S. Mikirtychyants, M. Nekipelov, D. Prasuhn, R. Schleichert, A. Sibirtsev, H. J. Stein, H. Stroeher, I. Zychor. 2006-08-21. Scalar-isovector K K-bar production close to threshold. https://doi.org/10.1140/epja%2Fi2006-10087-7

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