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Mixing of pentaquark and molecular states

  • Experimental Physics
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An Erratum to this article was published on 01 November 2005

Abstract.

There are experimental evidences for the existence of narrow states Θ + and Θ c with the same quantum numbers of \(uudd\bar s\) and \(uudd\bar c\) pentaquarks and also NK (*) and ND (*) molecular states. Their masses deviate from many theoretical estimates of the pure pentaquark and molecular states. In this work we study the possibility that the observed Θ + and Θ c are mixtures of pure pentaquark and molecular states. The mixing parameters are in general related to non-perturbative QCD which are not calculable at present. We determine them by fitting data from known states and then generalize the mechanism to Θ b to predict its mass and width. The mixing mechanism can also naturally explain the narrow width for Θ + and Θ c through destructive interferences, even if the pure pentaquark and molecular states have much larger decay widths. We also briefly discuss the properties of the partner eigenstates of Θ + and Θ c and the possibility of experimentally observe them. Moreover, probable consequences of multi-state mixing are also addressed.

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Authors and Affiliations

  1. Department of Physics, Nankai University, 300071, Tianjin, P.R. China

    Xiao-Gang He, Xue-Qian Li, Xiang Liu & Xiao-Qiang Zeng

  2. NCTS and Department of Physics, National Taiwan University, 1067, Taipei, Taiwan, R.O.C

    Xiao-Gang He

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Received: 6 March 2005, Revised: 29 July 2005, Published online: 27 September 2005

An erratum to this article is available at http://dx.doi.org/10.1140/epjc/s2005-02420-9.

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He, XG., Li, XQ., Liu, X. et al. Mixing of pentaquark and molecular states. Eur. Phys. J. C 44, 419–430 (2005). https://doi.org/10.1140/epjc/s2005-02383-9

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