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Paper IPM / P / 15192  


Abstract:  
There are different assumptions on the substructure of the pentaquarks P_{c}(4380) and P_{c}(4450), newly founded in J/ψN 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 spin3/2 negativeparity and spin5/2 positiveparity pentaquarks, respectively. There may exist oppositeparity 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 P_{c}(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 spin3/2 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 oppositeparity state's transition may help experimentalists in the search for the possible positive parity spin3/2 pentaquark of ―ccduu.
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