Is d^* a candidate of hexaquark-dominated exotic state?

2014/08/03 by F. Huang, Fei Huang, Huang, F. +7 · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Nuclear physics research studies #Quantum Chromodynamics and Particle Interactions #hep-ph #nucl-ex #nucl-th

paper · pdf · doi:10.48550/arxiv.1408.0458

4 pages, 2 figures

arxiv created 2015/03/13 · arxiv updated 2015/03/16

Abstract

We confirm our previous prediction of a d^* state with I(J^P)=0(3⁺) [Phys. Rev. C 60, 045203 (1999)] and report for the first time based on a microscopic calculation that d^* is a hexaquark dominated exotic state as it has about 2/3 hidden color (CC) configurations. By performing a more elaborate dynamical coupled-channels investigation of the ΔΔ-CC system within the framework of resonating group method (RGM) in a chiral quark model, we found that the d^* state has a mass of about 2.38-2.42 GeV, a root-mean-square radius (RMS) of 0.76-0.88 fm, and a CC fraction of 66%-68%. The last ensures that the d^* has a rather narrow width which, together with the quantum numbers and our calculated mass, is consistent with the newly observed resonance-like structure (M≈ 2380 MeV, Γ≈ 70 MeV) in double-pionic fusion reactions reported by WASA-at-COSY Collaboration.

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