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A light collective theta+ baryon state (with strangeness +1) was predictedvia rigid-rotor collective quantization of SU(3) chiral soliton models. Thispaper explores the validity of this treatment. A number of rather generalanalyses suggest that predictions of exotic baryon properties based on thisapproximation do not follow from large Nc QCD. These include an analysis of thebaryon's width, a comparison of the predictions with general large Ncconsistency conditions of the Gervais-Sakita-Dashen-Manohar type; anapplication of the technique to QCD in the limit where the quarks are heavy; acomparison of this method with the vibration approach of Callan and Klebanov;and the 1/Nc scaling of the excitation energy. It is suggested that the originof the problem lies in an implicit assumption in the that the collective motionis orthogonal to vibrational motion. While true for non-exotic motion, theWess-Zumino term induces mixing at leading order between collective andvibrational motion with exotic quantum numbers. This suggests that successfulphenomenological predictions of theta+ properties based on rigid-rotorquantization were accidental.Comment: 19 pages; A shorter more readable versio

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>θ</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>baryon in soliton models: Large<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>N</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>QCD and the validity of rigid-rotor quantization

θ+baryon in soliton models: LargeNcQCD and the validity of rigid-rotor quantization