1998/03/27 by F. Iddir, S. Safir O. Pène, S. Safir +1 · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1016/s0370-2693(98)00603-0
published as Phys.Lett.B433:125-138,1998 · 18 pages, Latex2e
arxiv created 1998/03/27 · openalex publication_date 1998/08/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Hybrid c c g of quantum numbers 1-- are considered in a quark model with constituant quarks and gluon. The lowest JP=1- states may be built in two ways, lg=1 (gluon excited) corresponding to an angular momentum between the gluon and the c c system, while lc c=1 (quark excited) corresponds to an angular momentum between the c and the c. The lowest lying hybrid JP=1- state in the flux tube model is similar to the lg=1 in the quark-gluon model. In particular it verifies the selection rule that it cannot decay into two fundamental mesons. The lq q=1 hybrid may decay into two fundamental mesons, but with decay widths larger than 1 GeV, which tells that they do not really exist as resonant states. Using a chromoharmonic potential, we find no mixing between the lg=1 and lc c=1. More realistic potentials might induce a strong mixing between them, implying that no hybrid meson exist. If, on the contrary, such a strong mixing does not occur, we find, in agreement with the flux tube model, that only the lg=1 appears as a real resonant state. In such a case, hybrid mesons may exist as resonances only if they are decoupled from the ground state channels, which explains the difficulty to observe them experimentally. We reconsider accordingly the Ono-Close-Page scenario of mixing between charmonium and charmed-hybrid to explain the anomalies around 4.1 GeV. We find a very small mixing between radially excited charmonium and hybrid mesons, which forbids considering the ψ(4.040) and ψ(4.160) as combinations of 3S charmonium and lg=1 hybrid meson with a large mixing.