Implications of the Present Bound on the Width of the Theta(1540)

Abstract

The recently reported Theta(1540) exotic baryon seems to be very narrow: Gamma(Theta)< 1 MeV according to some analyses. Using methods of low energy scattering theory, we develop expectations for the width of the Theta, an elastic resonance in KN scattering in a theory where the characteristic range of interactions is ~1 Fermi. If the Theta is a potential scattering resonance, generated by the forces in the KN channel, its width is hard to account for unless the KN-channel orbital angular momentum, l, is two or greater. If the Theta is a CDD pole, its coupling to the scattering channel is at least an order of magnitude less than the coupling of the Lambda(1520) unless l is two or greater. Either way, if the Theta proves to be in the KN s- or p-wave, new physics must be responsible for its narrow width.

arXiv comment8 pages, 2 figures

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Cited by in corpus (9)

• Decay of Theta+ in a quark model
• Theta+ formation in inclusive gamma D -> pK- X
• Search for ${\Theta }^{++}$ Pentaquarks in the Exclusive Reaction $\gamma p\to K^{+}{K}^{-}p$
• Spin-3/2 pentaquark in the QCD sum rule
• Kaon-Soliton Bound State Approach to the Pentaquark States
• Calculating loops without loop calculations: NLO computation of pentaquark correlators
• Pentaquarks, Skyrmions and the Vector Manifestation of Chiral Symmetry
• P-wave Pentaquark and its Decay in the Quark Model with Instanton Induced Interaction
• Nucleon in Nuclear Matter