Speaker
Description
In this talk, based on [1], I will discuss the differential cross-section for single-inclusive jet/hadron production with transverse momentum $P_\perp$ in Deep Inelastic Scattering (DIS) at small Bjorken $x_{\rm Bj}$, mediated by a virtual photon with virtuality $Q^2$. Unlike most studies at small $x$, which focus on particle production in the current fragmentation region, this study emphasises the kinematic regime where the jet is produced in the target fragmentation hemisphere of the Breit frame, and with $P_\perp \ll Q$. For a longitudinally polarised photon, I will demonstrate that this cross-section is not power suppressed in $P_\perp/Q$ and can be factorised in terms of extended quark and gluon jet fracture functions. I will finally comment on the phenomenological implications for saturation physics at the future Electron-Ion Collider. In particular, preliminary numerical estimates show that the extended quark jet fracture function is the most sensitive to saturation effects in large nuclei. .
[1] P. Caucal, F. Salazar, arXiv:2502.02634
