期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 1, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP01(2020)124
关键词
Phenomenological Models; QCD Phenomenology
资金
- National Science Foundation (NSF) [PHY-1803912]
- Western Alliance to Expand Student Opportunities (WAESO) Louis Stokes Alliance for Minority Participation Bridge to the Doctorate (LSAMPBD) NSF [HRD-1702083]
- NASA
We incorporate fine-structure corrections into the dynamical diquark model of multiquark exotic hadrons. These improvements include effects due to finite diquark size, spin-spin couplings within the diquarks, and most significantly, isospin-dependent couplings in the form of pionlike exchanges assumed to occur between the light quarks within the diquarks. Using a simplified two-parameter interaction Hamiltonian, we obtain fits in which the isoscalar J(PC) = 1(++) state - identified as the X (3872) - appears naturally as the lightest exotic (including all states that are predicted by the model but have not yet been observed), while the closed-charm decays of Z(c)(3900) and Z(c)(4020) prefer 13; and h(c) modes, respectively, in accord with experiment. We explore implications of this model for the excited tetraquark multiplets and the pentaquarks.
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