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Paper   IPM / P / 15192
School of Physics
  Title:   Strong Decay of Pc(4380) Pentaquark in a Molecular Picture
  Author(s): 
1.  K. Azizi
2.  Y. Sarac
3.  H. Sundu
  Status:   Published
  Journal: Phys. Lett. B
  Vol.:  782
  Year:  2018
  Pages:   694-701
  Supported by:  IPM
  Abstract:
There are different assumptions on the substructure of the pentaquarks Pc(4380) and Pc(4450), newly founded in JN invariant mass by the LHCb collaboration, giving consistent mass results with the experimental observations. The experimental data and recent theoretical studies on their mass allow us to interpret them as spin-3/2 negative-parity and spin-5/2 positive-parity pentaquarks, respectively. There may exist opposite-parity states corresponding to these particles, as well. Despite a lot of studies, however, the nature and organization of these pentaquarks in terms of quarks and gluons are not clear. To this end we need more theoretical investigations on other physical properties of these states. In this accordance, we study a strong and dominant decay of the Pc(4380) to J/ψ and N in the framework of three point QCD sum rule method. An interpolating current in a molecular form is applied to calculate six strong coupling form factors defining the transitions of the positive and negative parity spin-3/2 pentaquark states. The results of the coupling constants are used in the calculation of the decay widths of these transitions. The obtained result for the decay width of the negative parity state is compatible with the experimental observation. Our prediction for the width of the opposite-parity state's transition may help experimentalists in the search for the possible positive parity spin-3/2 pentaquark of ccduu.

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