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There is no κ(900).

Cherry, S. N. and Pennington, M. R. (2001) 'There is no κ(900).', Nuclear physics A., 688 (3-4). pp. 823-841.


In the I=0 sector there are more scalar mesons than can fit in one nonet. Consequently, many have claimed that there is in fact more than one multiplet, perhaps both and . Such proposals require the existence of at least two strange isodoublets (and their antiparticles). The current PDG tables list just one state, the K*0(1430), while fits to data with Breit–Wigner forms and variable backgrounds can accommodate a κ(900), too. Whether a state exists in the spectrum of hadrons is not a matter of ability to fit data along the real energy axis, but is completely specified by the number of poles in the complex energy plane. Here we perform as model-independent an analytic continuation of the LASS πK scattering results between 825 MeV and 2 GeV as presently possible to determine the number and position of resonance poles. We find that there is a K*0(1430), but no κ(900). The LASS data cannot rule out the possibility of a very low mass κ well below 825 MeV.

Item Type:Article
Keywords:Analytic properties, Scalar mesons, Strange mesons.
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Record Created:15 Dec 2006
Last Modified:29 Sep 2016 10:40

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