Direct Measurement of Upward-going Ultrahigh Energy Dark Matter at the Pierre Auger Observatory. (arXiv:1910.11158v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Xu_Y/0/1/0/all/0/1">Ye Xu</a>
In the present paper, it is assumed that there exist two dark matter
particles: superheavy dark matter particles (SHDM), whose mass $sim$ inflaton
mass, and light fermion dark matter (DM) particles which are the ultrahigh
energy (UHE) products of its decay. The Earth will be taken as a detector to
directly search for the UHE DM particles. These upward-going particles, which
pass through the Earth and air and interact with nuclei, can be detected by the
fluorescence detectors (FD) of the Pierre Auger observatory (Auger), via
fluorescent photons due to the development of an EAS. The event rates of UHE DM
particles measured at the FD of Auger are evaluated in the incoming energy
range between 1 EeV and 1 ZeV when the different lifetimes of decay of SHDM.
And the UHE DM fluxes are estimated at the FD of Auger when the different
lifetimes of decay of SHDM. Finally, according to the Auger data from 2008 to
2019, the upper limit for UHE DM fluxes is estimated at 90% C.L. at the FD of
Auger.
In the present paper, it is assumed that there exist two dark matter
particles: superheavy dark matter particles (SHDM), whose mass $sim$ inflaton
mass, and light fermion dark matter (DM) particles which are the ultrahigh
energy (UHE) products of its decay. The Earth will be taken as a detector to
directly search for the UHE DM particles. These upward-going particles, which
pass through the Earth and air and interact with nuclei, can be detected by the
fluorescence detectors (FD) of the Pierre Auger observatory (Auger), via
fluorescent photons due to the development of an EAS. The event rates of UHE DM
particles measured at the FD of Auger are evaluated in the incoming energy
range between 1 EeV and 1 ZeV when the different lifetimes of decay of SHDM.
And the UHE DM fluxes are estimated at the FD of Auger when the different
lifetimes of decay of SHDM. Finally, according to the Auger data from 2008 to
2019, the upper limit for UHE DM fluxes is estimated at 90% C.L. at the FD of
Auger.
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