Extraction of the K K¯ isovector scattering length from pp -&gt; d K+ K¯0 data near threshold

Lemmer, R. H.

doi:10.1016/j.physletb.2005.11.074

Journal Article

PreJuSER-57872

Extraction of the K K¯ isovector scattering length from pp -> d K+ K¯0 data near threshold

Lemmer, R. H.FZJ*

2006
North-Holland Publ. Amsterdam

Physics letters / B 633, (2006) [10.1016/j.physletb.2005.11.074]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10615 doi:10.1016/j.physletb.2005.11.074

Abstract: The results of a recent experiment measuring the reaction pp -> dK(+)K(0) near threshold are interpreted in terms of a spectator model that encapsulates the main features of the observed (K+K0) invariant mass distribution. A X 2 fit to this data leads to an imaginary part of the isovector scattering length in the KK channel of Im(a(1)) = -(0.63 +/- 0.24) fm. We then use the Flatte representation of the scattering amplitude to infer a value Re(a I) = - (0.02 +/- 0.02) fm for the real part under the assumption that scaling [V Baru, J. Haidenbauer, C. Hanhart, A. Kudryavtsev, U.G. Meissner, Eur. Phys. J. A 23 (2005) 523] is approximately satisfied. We show further that it is not possible to exclude the effects of pi(+)eta to (K+K0) channel coupling within the context of our model. (c) 2005 Elsevier B.V. All rights reserved.

Keyword(s): p p: exclusive reaction ; K: pair production ; threshold ; deuteron: spectator ; scattering amplitude ; a0(980) ; K anti-K: scattering length ; isovector ; parametrization ; channel cross section: mass ; numerical calculations ; interpretation of experiments: Juelich COSY PS ; p p --> deuteron anti-K0 K+