Topic 2: Quarkonium production processes
Description & objectives:
Quarkonia are bound states of a quark and an antiquark, where usually one means the heavy charm or bottom quarks.
The first such state, the charmonium particle nowadays called J/ψ, was discovered in 1974 (earning Burton Richter and Samuel Ting the 1976 Nobel Prize in Physics).
The first bottomonium state was discovered in 1977. Despite that these discoveries were made long ago and quarkonia are produced in large amounts at particle colliders,
the quarkonium production mechanism itself is still not fully understood. There is not a single study that can describe all available data well simultaneously.
My objective is to suggest ways to resolve this problem by combining specific studies at the LHC and the future EIC. This can best be done in combination with the study of
certain gluon distributions, since the quarkonia are produced mostly from gluon initiated processes, so hopefully we can tackle these two objectives simultaneously.
Selected scientific highlights:
- Luca Maxia, Daniël Boer, and Jelle Bor, "The impact of the TMD shape function on matching the transverse momentum spectrum in J/ψ production at the EIC", arXiv:2504.19617.
- D. Boer et al., "Physics case for quarkonium studies at the Electron Ion Collider", Progress in Particle and Nuclear Physics 142 (2025) 104162.
- J. Bor, "Gluon-induced quarkonium production in transverse-momentum-dependent factorisation: applications to the LHC and EIC", PhD thesis 2025.
- ECT* workshop on "Synergies between LHC and EIC for Quarkonium Physics", July 8–12, 2024, Trento, Italy.
- Daniël Boer, Jelle Bor, Luca Maxia, Cristian Pisano, Feng Yuan, "Transverse momentum dependent shape function for J/ψ production in SIDIS", JHEP 08 (2023) 105.
- Jelle Bor, Daniël Boer, "TMD evolution study of the cos2ϕ azimuthal asymmetry in unpolarized J/ψ production at EIC", Physical Review D 106 (2022) 014030.
- Daniël Boer, Cristian Pisano, Pieter Taels, "Extracting Color Octet NRQCD matrix elements from J/ψ production at the EIC", Physical Review D 103 (2021) 074012.
- Daniël Boer, Umberto D’Alesio, Francesco Murgia, Cristian Pisano, Pieter Taels, "J/ψ meson production in SIDIS: matching high and low transverse momentum", JHEP 09 (2020) 040.
- F. Scarpa, "Studies and applications of linearly polarized gluons at LHC", PhD thesis 2020.
- Florent Scarpa, Daniël Boer, Miguel G. Echevarria, Jean-Philippe Lansberg, Cristian Pisano, Marc Schlegel, "Studies of gluon TMDs and their evolution using quarkonium-pair production at the LHC", European Physical Journal C 80 (2020) 87.
- Alessandro Bacchetta, Daniël Boer, Cristian Pisano, Pieter Taels, "Gluon TMDs and NRQCD matrix elements in J/ψ production at an EIC", European Physical Journal C 80 (2020) 72.
- Jen-Chieh Peng, Daniël Boer, Wen-Chen Chang, Randall Evan McClellan, Oleg Teryaev, "On the Rotational Invariance and Non-Invariance of Lepton Angular Distributions in Drell-Yan and Quarkonium Production", Physics Letters B 789 (2019) 356–359.
- D. Boer and C. Pisano, "Polarized gluon studies with charmonium and bottomonium at LHCb and AFTER", Physical Review D 86 (2012) 094007.
Funding:
For part of my research on this topic I have received funding
from the European Union's Horizon 2020 research and
innovation program under Grant Agreement No. 824093
(STRONG 2020).