The ePIC detector requires a high precision, low material, well integrated tracking system to meet the requirements of the EIC physics program. The ePIC tracking system is comprised of silicon MAPS, MPGDs, and AC-LGAD time-of-flight. Simulations of the tracking detector have informed the detector design. The design, performance, and conditions of the ePIC tracker in its current design are presented.
An accurate reconstruction of the kinematic variables x, y, Q2 is essential for the inclusive physics program at the future EIC. Conventional reconstruction methods usually rely on two of the four measured quantities (energy and angle of the scattered electron and hadronic final state). A kinematic fit using all measured quantities simultaneously allows one to obtain an estimate of the kinematic variables, as well as the energy of possible initial state radiation. A technique was developed to perform fitting in a Bayesian framework using informative priors for the relevant quantities, and its performance demonstrated in full simulations of the ePIC detector, as well as with H1 simulation and data.