2009/02/13 by Jo Dudek, Jozef Dudek, Robert Edwards +3 · 2 citations
Physics and Astronomy · #Atomic physics #Dipole #Excited state #High-Energy Particle Collisions Research #Inverse #Lattice (music) #Lattice QCD #Particle physics #Particle physics theoretical and experimental studies #Physics #Quadrupole #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Quark #Radiative transfer #hep-lat #hep-ph
paper · pdf · doi:10.1103/physrevd.79.094504
published as Phys.Rev.D79:094504,2009
arxiv created 2009/02/13 · openalex publication_date 2009/05/15 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We compute, for the first time using lattice QCD methods, charmonium radiative transition rates involving states of high spin and exotics. Utilizing a large basis of interpolating fields we are able to project out various excited-state contributions to three-point correlators computed on quenched anisotropic lattices. In the first lattice QCD calculation of the exotic 1^\ensuremath-+ \ensuremathηc1 radiative decay, we find a large partial width \ensuremathΓ(\ensuremathηc1\ensuremath→J/\ensuremathψ\ensuremathγ)\ensuremath∼100 keV. We find clear signals for electric dipole and magnetic quadrupole transition form factors in \ensuremathχc2\ensuremath→J/\ensuremathψ\ensuremathγ, calculated for the first time in this framework, and study transitions involving excited \ensuremathψ and \ensuremathχc1,2 states. We calculate hindered magnetic dipole transition widths without the sensitivity to assumptions made in model studies and find statistically significant signals, including a nonexotic vector hybrid candidate Yhyb?\ensuremath→\ensuremathηc\ensuremathγ. As well as comparison to experimental data, we discuss in some detail the phenomenology suggested by our results and the extent to which it mirrors that of quark-potential models, and make suggestions for the interpretation of our results involving exotic quantum numbered states.