Scalar-isovector K K-bar production close to threshold

Details Scalar-isovector K K-bar production close to threshold Scalar-isovector K K-bar production close to threshold

2006-05-24

arxiv.org/abs/nucl-ex/0605030v2

Eur.Phys.J.A29:245-251,2006

Physics

Nuclear Physics

Nuclear Experiment

7 pages, 6 figures; accepted for publication in Eur.Phys.J. A

Scientific paper

10.1140/epja/i2006-10087-7

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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