Measurement of Inclusive Jet Cross-Sections in Deep-Inelastic ep Scattering at HERA
H1 Collaboration, C. Adloff
TL;DR
The study measures inclusive jet cross-sections in deep-inelastic $ep$ scattering at HERA using the H1 detector, covering $5<Q^2<100~\mathrm{GeV}^2$ with jets defined in the Breit frame via the inclusive $k_\perp$ algorithm. It compares data to LO and NLO QCD predictions, applying hadronization corrections and detector/radiative corrections, and investigates the impact of renormalization-scale choices $\mu_R=E_T$ and $\mu_R=\sqrt{Q^2}$. The results show broad agreement with NLO in most regions when $\mu_R=E_T$, but forward jets with small $E_T$ and $Q^2$ exhibit significant discrepancies and large NLO/LO corrections, highlighting the need for higher-order calculations and improved theoretical modeling in low-$Q^2$ DIS jet production. Overall, the work demonstrates both the predictive power and the limitations of fixed-order QCD in DIS jet phenomena and informs future theoretical developments.
Abstract
A measurement of inclusive jet cross-sections in deep-inelastic ep scattering at HERA is presented based on data with an integrated luminosity of 21.1 pb^-1. The measurement is performed for photon virtualities Q^2 between 5 and 100 GeV^2, differentially in Q^2, in the jet transverse energy E_T, in E_T^2/Q^2 and in the pseudorapidity eta_lab. With the renormalization scale mu_R = E_T, perturbative QCD calculations in next-to-leading order (NLO) give a good description of the data in most of the phase space. Significant discrepancies are observed only for jets in the proton beam direction with E_T below 20 GeV and Q^2 below 20 GeV^2. This corresponds to the region in which NLO corrections are largest and further improvement of the calculations is thus of particular interest.