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

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.

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

References in corpus (3)

• Experimental Limits on the Width of the Reported Theta(1540)+
• A Diquark Chiral Effective Theory and Exotic Baryons
• Width of the J^P=1/2^+ pentaquark in the quark-diquark model

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• Observation of a narrow baryon resonance with positive strangeness formed in $K^{+}$Xe collisions
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