Speaker
Description
Semi-Inclusive Deep Inelastic Scattering (SIDIS) is a key component of the physics program of the future Electron--Ion Collider (EIC), providing multidimensional access to the internal structure of nucleons and nuclei. Through measurements of hadron transverse momentum and azimuthal modulations, SIDIS enables detailed studies of parton dynamics, transverse-momentum--dependent (TMD) structure functions, and hadronization mechanisms in the deep-inelastic scattering regime. These observables are directly relevant for the extraction of parton densities and TMDs, and place stringent requirements on detector acceptance, momentum resolution, particle identification, and control of experimental backgrounds.
The ePIC detector, the reference experiment for the EIC, has been designed as a general-purpose apparatus optimized to meet these challenges. Its nearly hermetic coverage, high-precision tracking and vertexing, and comprehensive particle identification systems provide the experimental foundation for precision SIDIS measurements over a broad kinematic range in Bjorken-$x$, momentum transfer $Q^2$, hadron momentum, and rapidity.
In this contribution, we present SIDIS performance studies for ePIC based on full detector simulations. Different methods for reconstructing SIDIS kinematics, including electron-based and hadron-based approaches, are discussed and compared in terms of resolution and stability across the relevant phase space. The resulting performance on key variables such as $x$, $Q^2$, the hadron energy fraction $z$, and the hadron transverse momentum $P_{hT}$ is quantified, highlighting regions of enhanced sensitivity to detector performance.
We focus on benchmark SIDIS measurements central to the DIS physics program, including charged-hadron multiplicities and azimuthal modulations sensitive to TMD dynamics. The role of particle identification is emphasized, demonstrating the combined performance of time-of-flight and Ring Imaging Cherenkov detectors in achieving efficient pion, kaon, and proton separation over a wide momentum range. This capability is essential for flavor-separated SIDIS measurements and for extending the kinematic reach toward forward rapidities.
These studies demonstrate that ePIC satisfies the experimental requirements of the SIDIS program at the EIC and will enable high-precision DIS measurements in future experimental campaigns.
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