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Implications of the Present Bound on the Width of the Theta(1540) | | R. L. Jaffe
; Ambar Jain
; | | Date: |
3 Aug 2004 | | Journal: | Phys.Rev. D71 (2005) 034012 | | Subject: | hep-ph hep-ex nucl-ex nucl-th | | 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. | | Source: | arXiv, hep-ph/0408046 | | Services: | Forum | Review | PDF | Favorites | |
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