Improving dark matter decay sensitivities with HAWC with Inverse ComptonScattering

The particle nature of Dark Matter(DM) has been a long lasting mystery. The High Altitude

Water Cherenkov(HAWC) , ground based gamma ray observatory was proven to be sensitive enough

to capture the gamma ray signal originated from the DM decay in the galactic halo. However, the

observational data obtained show no excess in gamma ray flux in the Northern Fermi Bubble. The

absence of excess gamma ray flux gives a 95% confidence level upper limit of flux which can be used

to constrain the DM decay limit for different channels. Following the the work done by HAWC

Collaboration (2018), we introduce an additional Inverse Compton scattering contribution with the background

Interstellar radiation field(ISRF) and the extragalactic flux in the calculation. This is able to give a stronger

decay lifetime limit than the previous study has shown.