Year: 2026
Type: preprint
Abstract: Radiative transitions of hybrid mesons probe nonperturbative gluodynamics, particularly the interplay between quark spin and gluonic excitations, and are of direct relevance to the search for exotic hadrons at Jefferson Lab. We calculate these transitions across the lowest charmonium-hybrid multiplet in a constituent gluon model based on Coulomb-gauge QCD in the heavy quark expansion. The results for $Y\toη_cγ$ and $Y\to χ_{c0}γ$ overlap the width obtained in quenched lattice computations, whereas $η_{c1}\to J/ψγ$ is substantially below the corresponding lattice estimate.
Source: arXiv (Cornell University)
Authors: Jafarzade, Shahriyar, Swanson, Eric S.
Institution: University of Pittsburgh
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funder: U.S. Department of Energy
Award: G1553439044
OpenAlex ID: W7222615549