Mass Composition Measurement with the TALE Hybrid Detector

We report on the cosmic ray mass composition measured by the Telescope Array Low-energy Extension (TALE) hybrid detector. The TALE detector began hybrid operations in 2017 after a surface detector (SD) array of 80 scintillation counters, 40 detectors with 400 m spacing and 40 with 600 m spacing, was added in front of the Middle Drum telescope station which includes 10 high-elevation fluorescence telescopes. In addition, since 2023 we have started upgraded hybrid observations adding an infill array of 50 SDs with 100\,m spacing to further reduce the energy threshold into the PeV range. In this contribution, we will present the latest cosmic ray mass composition measurement result in the energy range from $10^{15.5}$ eV to $10^{18.5}$ eV.