Measuring the region 0.1<Q2<1.0 GeV2 is essential to support searches for gluon saturation at the future Electron-Ion Collider. Recent studies have revealed that covering this region at the highest beam energies is not feasible with current detector designs, resulting in the so-called Q2 gap. In this work, we present a design for the Few-Degree Calorimeter (FDC), which addresses this issue. The FDC uses SiPM-on-tile technology with tungsten absorber and covers the range of −4.6<η<−3.6. It offers fine transverse and longitudinal granularity, along with excellent time resolution, enabling standalone electron tagging. Our design represents the first concrete solution to bridge the Q2 gap at the EIC.
@article{arxiv.2307.12531,
title = {A Few-Degree Calorimeter for the future Electron-Ion Collider},
author = {Miguel Arratia and Ryan Milton and Sebouh J. Paul and Barak Schmookler and Weibin Zhang},
journal= {arXiv preprint arXiv:2307.12531},
year = {2024}
}