2002/12/31 by Hai-Yang Cheng · 8 citations
Physics and Astronomy · #Annihilation #Charm quark #Factorization #Hadron #High-Energy Particle Collisions Research #Isoscalar #Meson #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Pseudoscalar #Pseudoscalar meson #Quantum Chromodynamics and Particle Interactions #Quark #Scalar (mathematics) #Scalar meson #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.67.034024
published as Phys.Rev. D67 (2003) 034024 · 27 pages, 3 figures, version to appear in Phys. Rev
arxiv created 2003/01/06 · openalex publication_date 2003/02/27 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The nonleptonic weak decays of charmed mesons into a scalar meson and a pseudoscalar meson are studied. The scalar mesons under consideration are \ensuremathσ [or f0(600)], \ensuremathκ, f0(980), a0(980) and K0*(1430). A consistent picture provided by the data suggests that the light scalars below or near 1 GeV form an SU(3) flavor nonet and are predominately the q2q2 states, while the scalar mesons above 1 GeV can be described as a qq nonet. Hence, we designate q2q2 to \ensuremathσ,\ensuremathκ,a0(980),f0(980) and qq to K0*. Sizable weak annihilation contributions induced from final-state interactions are essential for understanding the data. Except for the Cabibbo doubly suppressed channel D+\ensuremath→f0K+, the data of \stackrel\ensuremath→D\ensuremathσ\ensuremathπ, f0\ensuremathπ, f0K, K0*\ensuremathπ can be accommodated in the generalized factorization approach. However, the predicted rates for \stackrel\ensuremath→Da0\ensuremathπ, a0K are too small by one to two orders of magnitude when compared with the preliminary measurements. Whether or not one can differentiate between the two-quark and four-quark pictures for the f0(980) produced in the hadronic charm decays depends on the isoscalar f0\ensuremath-\ensuremathσ mixing angle in the qq model.