Speaker
Ms
Julia Sammet
(Goethe University Frankfurt)
Description
We calculate two- and three-body decays of the (lightest) vector glueball into
(pseudo)scalar, (axial-)vector, as well as pseudovector and excited vector
mesons in the framework of an effective model of QCD. While absolute values of widths cannot be predicted because the corresponding coupling constants are unknown, some interesting branching ratios can be evaluated by
setting the mass of the yet hypothetical vector glueball to $3.8$ GeV as
predicted by quenched Lattice QCD.
We find that the decay mode $\omega\pi\pi$ should be one of the largest (both through the decay chain $\mathcal{O}\rightarrow b_{1}\pi\rightarrow$ $\omega\pi\pi$ and through the direct coupling $\mathcal{O}\rightarrow\omega\pi\pi$)$.$ Similarly, the
(direct and indirect) decay into $\pi KK^{\ast}(892)$ is sizable. Moreover,
the decays into $\rho\pi$ and $K^{\ast}(892)K$ are, although subleading,
possible and could play a role in explaining the $\rho\pi$ puzzle of the
charmonium state $\psi(2S)$ thank to a (small) mixing with the vector
glueball. The vector glueball can be directly formed at the ongoing BESIII
experiment as well as at the future PANDA experiment at the FAIR facility.
[PRD 95, 11.4004 (2017)][1]
[1]: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.95.114004
Summary
We calculate two- and three-body decays of the (lightest) vector glueball into
(pseudo)scalar, (axial-)vector, as well as pseudovector and excited vector
mesons in the framework of an effective model of QCD. While absolute values of widths cannot be predicted because the corresponding coupling constants are unknown, some interesting branching ratios can be evaluated by
setting the mass of the yet hypothetical vector glueball to $3.8$ GeV as
predicted by quenched Lattice QCD. The vector glueball can be directly formed at the ongoing BESIII experiment as well as at the future PANDA experiment at the FAIR facility.
Primary author
Ms
Julia Sammet
(Goethe University Frankfurt)
Co-authors
Prof.
Francesco Giacosa
(Institute of Physics, Jan Kochanowski University,)
Dr
Stanislaus Janowski
(-)
