Acta Physica Polonica B

Vol. 35, No. 3, March 2004, page 1055


First Results on K+ Production in pp and pD Interactions from ANKE and Planned Experiments on the Light Scalar Resonances a0/f0(980) at COSY

M. Buescher

ANKE is a magnetic spectrometer and detection system at an internal target position of COSY-Jülich optimized for charged kaon detection. Recent results from ANKE on kaon production in pp and pD interactions are reported. From the pp data first absolutely normalized angular and invariant-mass spectra for the reaction pp\to dK+\bar K0 have been obtained. A partial-wave decomposition reveals a strong contribution of  S-wave K\bar K-pairs with low relative energy, suggesting dominance of resonant kaon production via the a0+(980). This indicates that systematic studies of the light scalar resonances a0/f0(980) are possible at COSY. Final goal of these measurements - requiring a neutral-particle detector which is not yet available - is to obtain information about the charge-symmetry breaking a0-f0 mixing. From the analysis of the pD data it is concluded that the K+-production cross section on the neutron is significantly larger as compared to the proton. A cross-section ratio of \sigma n / \sigma p\sim 4 is deduced.

PACS numbers: 13.75.-n, 25.40.-h


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