Zexuan Chu | Searcharxiv

arXiv2024

On the role of $J/ψ$ production in electron-ion collisions

Within the framework of non-relativistic QCD (NRQCD) effective field theory, we study the leptoproduction of $J/ψ$ at next-to-leading order in perturbative QCD for both unpolarized and polarized electron-ion collisions. We demonstrate that the $J/ψ$-tagged deep inelastic scattering in the future Electron-Ion Collider can be served as a golden channel for the reasons including constraining NRQCD long distance matrix elements, probing the nuclear gluon distribution functions, as well as investigating the gluon helicity distribution inside a longitudinal polarized proton.

hep-ph↗

arXiv2022

1-jettiness with jet axis at $O(α_s)$ in jeep inelastic scattering

We present $O(α_s)$ analytic predictions for event shape 1-jettiness $τ_1$ distribution aiming measurements in deep inelastic scattering process at future Electron Ion Colliders. The result depends on conventional variables $x$ and $Q$ as well as on $τ_1$ and is relatively compact and easy to implement for numerical calculation. Three different choices of axis, with respect to which $τ_1$ is measured are considered in the Breit frame. The first is the one optimally adjusted to minimize $τ_1$ and the second and third are taken from anti-$k_T$ and Centauro jet algorithms defined with a jet radius parameter $R$, respectively. We find that the first and second give the same result at this order and are independent of $R$, while the third depends on the radius. This fixed-order result provides a nonsingular contribution to be combined with a singular log-resummed contribution to give the full spectrum in $τ_1$ space and also shows how fixed-order and resummation regions change as a function of $x$ and $Q$.

hep-ph↗