Abstract
The copious production of charm mesons at HERA has allowed QCD to be probed in open charm and charm vector meson production. Elastic and proton-dissociatve photoproduction of J / ψ mesons have been measured at HERA. The data are compared to other measurements and the W and t dependences are parametrised using phenomenological fits. The ψ (2 S ) state has also been measured exclusively and the ratio of its production rate to J / ψ mesons presented as a function of the kinematic variables. Inelastic production of J / ψ and ψ (2 S ) mesons gives insight into non-relativistic QCD and final results are presented here. Open charm production has been measured in order to better understand the fragmentation process of charm mesons as well as giving insight into the structure of the proton.
Highlights
Still 7 years after closing HERA ep collider new physical results based on its data are published
In case of charmonium production this is a two-scale process with large J/ψ mass and momentum transfer t and in the leading logarithmic (LL) QCD approximation it can be described by the exchange of a gluon ladder
At large |t| values, the cross section is expected to decrease according to power law
Summary
Still 7 years after closing HERA ep collider new physical results based on its data are published. The recent, selected results on heavy meson production at HERA from the H1 and ZEUS experiments are presented and interpreted within the framework of Quantum Chromodynamics
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
