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New results on the limit for the width of the exotic Theta^+ resonance

A. Sibirtsev·J. Haidenbauer·S. Krewald·Ulf-G. Meißner
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Abstract

We investigate the impact of the Θ^+(1540) resonance on differential and integrated cross sections for the reaction K^+d{\to}K^0pp, where experimental information is available at kaon momenta below 640 MeV/c. The calculation utilizes the Jülich KN model and extensions of it that include contributions from a Θ^+(1540) state with different widths. The evaluation of the reaction K^+d{\to}K^0pp takes into account effects due to the Fermi motion of the nucleons within the deuteron and the final three-body kinematics. We conclude that the available data constrain the width of the Θ^+(1540) to be less than 1 MeV.

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A. Sibirtsev, J. Haidenbauer, S. Krewald, Ulf-G. Meißner. 2004-08-19. New results on the limit for the width of the exotic Theta^+ resonance. https://doi.org/10.1016/j.physletb.2004.08.035

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