High energy window for probing dark matter with cosmic-ray antideuterium and antihelium

【摘要】 Cosmic-ray(CR) anti-nuclei are often considered important observables for indirect dark matter(DM)detection at low kinetic energies,below GeV per nucleon.Since the primary CR fluxes drop quickly towards high energies,the secondary anti-nuclei in CR are expected to be significantly suppressed in high energy regions(■100 GeV per nucleon).If DM particles are heavy,the annihilation productions of DM can be highly boosted,and thus the fluxes of anti-nuclei produced by DM annihilation may exceed the secondary background at high energies,which opens a high energy window for indirect DM detection.We investigate the possibility of detecting heavy DM particles which annihilate into high energy anti-nuclei.We use the Monte Carlo generators PYTHIA,EPOS-LHC and DPMJET and the coalescence model to simulate the production of anti-nuclei,and constrain the DM annihilation cross-sections by using the AMS-02 and HAWC antiproton data and the HESS galactic center y-ray data.We find that the conclusion depends on the choice of DM density profiles.For the "Cored" type profile with a DM particle mass ■10 TeV,the contributions from DM annihilation can exceed the secondary background in high energy regions,which opens the high energy window,while for the "Cuspy" type profile,the excess disappears.更多还原

【Abstract】 Cosmic-ray(CR) anti-nuclei are often considered important observables for indirect dark matter(DM)detection at low kinetic energies,below GeV per nucleon.Since the primary CR fluxes drop quickly towards high energies,the secondary anti-nuclei in CR are expected to be significantly suppressed in high energy regions(■100 GeV per nucleon).If DM particles are heavy,the annihilation productions of DM can be highly boosted,and thus the fluxes of anti-nuclei produced by DM annihilation may exceed the secondary background at high energies,which opens a high energy window for indirect DM detection.We investigate the possibility of detecting heavy DM particles which annihilate into high energy anti-nuclei.We use the Monte Carlo generators PYTHIA,EPOS-LHC and DPMJET and the coalescence model to simulate the production of anti-nuclei,and constrain the DM annihilation cross-sections by using the AMS-02 and HAWC antiproton data and the HESS galactic center y-ray data.We find that the conclusion depends on the choice of DM density profiles.For the "Cored" type profile with a DM particle mass ■10 TeV,the contributions from DM annihilation can exceed the secondary background in high energy regions,which opens the high energy window,while for the "Cuspy" type profile,the excess disappears.更多还原