arXiv subjects
Publications and source records attributed to Frank E. Close.
The application of our glueball-qqbar filter to the centrally produced KKbarpi system shows that the f1(1285) and f1(1420) have the same behaviour; namely consistent with the f1(1420) being the partner to the f1(1285) in the 3P1 nonet of axial mesons. We determine a flavour singlet-octet mixing angle of approximately 50 degrees for this nonet and highlight that the existence of the supposed f1(1510) needs confirmation.
We present arguments that reinforce the hybrid interpretation of pi(1800) and we establish that the rho(1450) and the omega(1420) can be interpreted as radial-hybrid mixtures. Some questions for future experiments are raised.
We develop tools to determine the gluonic content of a resonance of known mass, width and $J^{PC}$ from its branching fraction in radiative quarkonium decays and production cross section in $γγ$ collisions. We test the procedures by applying them to known $q\bar{q}$ mesons, then analyze four leading glueball candidates. We identify inconsistencies in data for $J/ψ\to γf_0(1500)$ and $J/ψ\to γf_J(1710)$ whose resolution can quantify their glueball status.When $Γ(f_0(1500) \to γγ)$ and $Γ(f_J(1710) \to γγ)$ are known, the $n\bar{n}, s\bar{s},gg$ mixing angles can be determined. The enigmatic situation in 1400-1500 MeV region of the isosinglet $0^{-+}$ sector is discussed.
Lectures at VII Jorge Andre Swieca Summer School in Nuclear Physics; Brasil; Jan 22 - Feb 4 1995. To be published by Plenum Press (C.A.Amaral Nunes ed.)
The mass difference of $c$ and $u$ quarks is similar to the energy needed to excite gluonic degrees of freedom in strong QCD. This underpins the degeneracy of $D$ and a recently observed candidate hybrid excitation of the $π$ at$\sim 1.8$GeV and may generate a strong analogue of Penguin mixing together with a measurable CP-violation in $D$ and $D_s$ decays.
We suggest that $ψ$ (4040) and $ψ$ (4160) are strong mixtures of ground state hybrid charmonium at $\sim 4.1$ GeV and the $ψ(3S)$ of conventional charmonium. The $Γ^{e^+e^-}$, masses and total widths of the $ψ(4040)$ and $ψ(4160)$ are in accord with this hypothesis. Their hadronic decays are predicted to be dominated by the $ψ(3S)$ component and hence are correlated. In particular we find a spin counting relation $Γ(4160 \rightarrow D_sD_s^*) \sim 4 Γ(4040 \rightarrow D_sD_s)$ due to their common $ψ(3S)$ component. For $D$ and $D^*$ production, using $ψ(4040)$ branching ratios as input, we predict that the decay pattern of the $ψ(4160)$ will be very different from that of the $ψ(4040)$. These predictions may be tested in historical data from SPEAR, BES or at future Tau-Charm Factories.