Measurement of the isospin-filtering dd 4HeK+K- reaction at Q = 39 MeV

Institute for Advanced Simulations, Forschungszentrum Jülich D-52425 Jülich Germany
European Physical Journal A (Impact Factor: 2.42). 10/2009; 42(1):1-6. DOI: 10.1140/epja/i2009-10849-7
Source: arXiv

ABSTRACT The total cross-section for the dd
® \rightarrow 4HeK
- reaction has been measured at a beam momentum of 3.7GeV/c, corresponding to an excess energy of 39MeV, which is the maximum possible at the Cooler Synchrotron COSY-Jülich. A deuterium
cluster-jet target and the ANKE forward magnetic spectrometer, placed inside the storage ring, have been employed in this
investigation. We find a total cross-section of stot \sigma_{{{\rm tot}}}^{} < 14 pb, which brings into question the viability of investigating the dd
® \rightarrow 4Hea
0(980) reaction as a means of studying isospin violation.

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    ABSTRACT: The near-threshold production of kaon-pairs has been investigated in proton-proton, proton-deuteron and deuteron-deuteron collisions at the Cooler Synchrotron COSY. The excitation function for the pp{yields}ppK{sup +}K{sup -} reaction and the invariant K{sup -}p, K{sup -}pp, and K{sup +}K{sup -} mass distributions indicate the presence of both K{sup -}p and K{sup +}K{sup -} final state interactions. Analogous final-state interactions of antikaons with deuterons has been found in the pp{yields}dK{sup +}K{sup 0}-bar reaction as well as in the pn{yields}dK{sup +}K{sup -} reaction, measured in the quasi-free pd{yields}p{sub sp}dK{sup +}K{sup -} process with a 'spectator' proton (p{sub sp}). The existing COSY data on the pd{yields}{sup 3}HeK{sup +}K{sup -} reaction are not yet sufficient to study the K{sup -3}He and K{sup +}K{sup -} final state interactions. A very small total cross section was found for the dd{yields}{sup 4}HeK{sup +}K{sup -} reaction.
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