# Initial Stages 2021

Jan 10 – 15, 2021
Weizmann Institute of Science
Asia/Jerusalem timezone
See you at IS2023 in Copenhagen in June 2023

## Probing gluon saturation via semi-inclusive deep inelastic scattering at the EIC

Jan 14, 2021, 5:30 PM
20m
Andrea's room 1 (vDLCC)

### Andrea's room 1

#### vDLCC

oral New facilities: DIS and hadronic experiments

### Speaker

Dr Dionysis Triantafyllopoulos (ECT* Trento)

### Description

Within the dipole picture for electron-nucleus ($eA$) deep inelastic scattering (DIS) at small Bjorken $x$, we consider special, aligned jet", configurations, which are very asymmetric: one of the quarks from the dipole fluctuation of the virtual photon carries most of the longitudinal momentum of its parent. We argue that such configurations correspond to relatively large dipole sizes and thus can be sensitive to saturation effects in the nuclear target even for relatively hard processes, where the photon virtuality $Q^2$ is considerably larger than the target saturation momentum $Q_s^2$. This offers a possibility to push the physics of saturation to larger values of $Q^2$, or to higher values for $x$. We propose to explore this possibility at the future Electron Ion Collider via special measurements of semi-inclusive DIS in which the longitudinal momentum of the tagged jet (or hadron) is measured as well. We predict new phenomena associated with gluon saturation in the very-forward regime, where the longitudinal momentum fraction $z$ of the measured jet is close to one. In particular, we predict the emergence of a Cronin peak in the nuclear modification factor for $1-z\ll 1$ and moderate $x\sim 0.01$, and disappearance of this peak when further decreasing $x$, or increasing $1-z$. We also predict a very strong $z$-dependence of the SIDIS cross-section near $z=1$: a power in $1/(1-z)$.

### Primary authors

Prof. Alfred H. Mueller (Columbia University) Dr Dionysis Triantafyllopoulos (ECT* Trento) Dr Edmond Iancu (Université Paris-Saclay (FR)) Dr Shuyi Wei (ECT* Trento)

### Presentation materials

 Recording Triantafyllopoulos.pdf