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Radiative Transitions in Charmonium from Lattice QCD

Accepted version
Peer-reviewed

Type

Article

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Authors

Delaney, James 
Thomas, Christopher E 
Ryan, Sinéad M 

Abstract

The coupling of various charmonium mesons to a photon is studied using lattice QCD, giving access to radiative form factors and transitions, and probing the mesons' structure. Methods are developed which allow the robust determination of amplitudes, including those involving an excited state as well as multiple form factors, for a range of kinematics. These are applied in dynamical lattice QCD calculations using the distillation technique to compute the underlying three-point correlation functions. Form factors and amplitudes involving the low-lying charmonia, ηc, J/ψ, χc0 and ηc, are calculated, demonstrating the methods and providing the first dynamical lattice QCD results for some quantities.

Description

Keywords

hep-lat, hep-lat, hep-ph

Journal Title

Journal of High Energy Physics (JHEP)

Conference Name

Journal ISSN

1126-6708
1029-8479

Volume Title

Publisher

SpringerOpen

Publisher DOI

Publisher URL

Sponsorship
STFC (ST/T000694/1)
STFC (2045177)