Understanding a High Gain vs Low Gain Discrepancy in an ePIC LFHCal Test Module

The Longitudinally-segmented Forward Hadronic Calorimeter (LFHCal) will be part of the ePIC detector at the Electron/Ion Collider (EIC). The LFHCal is made up of smaller modules that consist of alternating layers of steel and scintillating tiles read out by Silicon Photomultipliers (SiPMs). In September 2024 a prototype module was tested at the CERN Proton-Synchrotron T9 beam line with a wide range of energies and beam types. In one test beam readout mode, each SiPM reads out through both a high gain and a low gain path. Analysis of the test beam data revealed a discrepancy in the comparison between the high gain and low gain values for different beam types. My analysis of the test beam data has included studying minimum ionizing events (MIPs) in hadron and muon test beam runs to help us understand the HG/LG discrepancy. I will describe the LFHCal, the 2024 test beam and its analysis, and present the results of my MIP study.