Comment on The Evidence for a Pentaquark and Kinematic Reflections

Details Comment on The Evidence for a Pentaquark and Kinematic Reflections Comment on The Evidence for a Pentaquark and Kinematic Reflections

2004-11-19

arxiv.org/abs/hep-ph/0411265v3

Phys.Rev.D71:098501,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

Comment submitted to Phys. Rev. D (no figures)

Scientific paper

10.1103/PhysRevD.71.098501

The Regge exchange model used by Dzierba et al. is shown to be questionable, since the pion pole term is not allowed. Hence the Regge amplitudes in their calculation are exaggerated. The amount of kinematic reflection in the mass spectrum of the (nK+) system, which is one decay channel of a possible pentaquark, is not well justified in the fitting procedure used by Dzierba et al., as shown by comparison with the (K+K-) invariant mass spectrum, which is one decay channel of the a_2 and f_2 tensor mesons. While kinematic reflections are still a concern in some papers that have presented evidence for the pentaquark, better quantitative calculations are needed to demonstrate the significance of this effect.

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