Pentaquark states in a diquark–triquark model

By R. Zhu, C. Qiao. 2015

140 citations recorded by the source corpus.

Abstract The diquark–triquark model is used to explain charmonium-pentaquark states, i.e., P c ( 4380 ) and P c ( 4450 ) , which were observed recently by the LHCb Collaboration. For the first time, we investigate the properties of the color attractive configuration of a triquark and we define a nonlocal light cone distribution amplitude for pentaquark states, where both diquark and triquark are not pointlike, but they have nonzero size. We establish an effective diquark–triquark Hamiltonian based on spin–orbital interaction. According to the Hamiltonian, we show that the minimum mass splitting between 5 2 + and 3 2 − is around 100 MeV, which may naturally solve the challenging problem of small mass splitting between P c ( 4450 ) and P c ( 4380 ) . This helps to understand the peculiarities of P c ( 4380 ) with a broad decay width whereas P c ( 4450 ) has a narrow decay width. Based on the diquark–triquark model, we predict more pentaquark states, which will hopefully be measured in future experiments.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/e8b8bb9ffce4700b030cb524c12c6f1bb921f2a8

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In Nuclear and High Energy Physics

1. R. Mitchell
2. J. Lange
3. S. Stone
4. A. Ali
5. E. Swanson
6. R. Lebed
7. M. Nielsen
8. S. H. Lee

Citations in the corpus

• Heavy-quark QCD exotica (2016, background): “[251], and applied to hidden-strangeness system in Refs.”
• Observation of $J/\psi p$ Resonances Consistent with Pentaquark States in $\Lambda_b^0 \to J/\psi K^- p$ Decays (2015, unknown): “antiquark-diquark-diquark [78–83] and diquark-triquark configurations [84, 85].”
• Exotic Hadrons from Heavy Ion Collisions (2017, background): “After the observation of the two P + c structures, many theoretical works appeared proposing various explanations for these structures [191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209].”
• Exotics: Heavy pentaquarks and tetraquarks (2017, background): “For a similar classification in the diquark-triquark picture, see [383].”