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We present a measurement of the energy spectrum of the light mass group ofcosmic rays (protons and helium) with the High Altitude Water Cherenkov (HAWC)Observatory in the energy interval from $10$ TeV to $200$ TeV. The spectrumcovers the energy range between direct and indirect measurements, whereprecision data on the composition of cosmic rays are needed. The spectrum wasconstructed by applying an unfolding technique on a proton plus helium enrichedsub-sample ($>90\%$ abundance) of cosmic ray air showers selected from the HAWCcosmic-ray data. The subset contains $3.8 \times 10^{9}$ air shower events withprimary energies in the interval $1$ TeV to $300$ TeV and zenith angles lessthan $16.7$ degrees. Mass selection was performed using an analysis of thelateral age parameter of air shower events, based on both CORSIKA/QGSJET-II-03simulations and event-by-event measurements on the lateral structure of theshower front and the primary energy of the showers.

The spectrum of the light component of TeV cosmic rays measured with HAWC