The Second LHAASO Collaboration Conference in 2026 & The Academic Symposium for the 10th Anniversary of the LHAASO collaboration

LHAASO is a composite cosmic ray observatory comprising KM2A, WCDA, and WFCTA detector arrays. One of the core scientific goals is to precisely measure the energy spectra of individual cosmic ray components, establish a bridge between space-borne and ground-based experiments to constrain the origin, acceleration, and propagation mechanisms of cosmic rays. This work presents the joint measurement of proton fluxes around 100 TeV using DAMPE and LHAASO. By operating six WFCTA telescopes at a zenith angle of 8° in hybrid mode with KM2A, the energy threshold is lowered to ~50 TeV. Energy reconstruction combines the Cherenkov photons from WFCTA and the muon count from KM2A, achieving a resolution better than 20%. High-purity proton samples are selected via composition-sensitive parameters, achieving an efficiency of 25% and a purity of approximately 85%. The resulting proton spectrum from 50–400 TeV exhibits a clear and smooth hardening around 100 TeV.