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

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

2004-05-12

arxiv.org/abs/hep-ph/0405099v2

Phys.Lett.B599:230-235,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 5 figures, updated version, accepted for publication in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2004.08.035

We investigate the impact of the \Theta^+(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 J\"ulich KN model and extensions of it that include contributions from a \Theta^+(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 \Theta^+(1540) to be less than 1 MeV.

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