High to ultrahigh energy neutrino detectors can uniquely probe the propertiesof dark matter $chi$ by searching for the secondary products produced throughannihilation and/or decay processes. We evaluate the sensitivities to darkmatter thermally averaged annihilation cross section $langlesigma vangle$and partial decay width into neutrinos $Gamma_{chiightarrowuar{u}}$(in the mass scale $10^7 leq m_chi/{m GeV} leq 10^{15}$) for nextgeneration observatories like POEMMA and GRAND. We show that in the range $10^7 leq m_chi/{m GeV} leq 10^{11}$, space-based Cherenkov detectors likePOEMMA have the advantage of full-sky coverage and rapid slewing, enabling anoptimized dark matter observation strategy focusing on the Galactic center. Wealso show that ground-based radio detectors such as GRAND can achieve highsensitivities and high duty cycles in radio quiet areas. We compare thesensitivities of next generation neutrino experiments with existing constraintsfrom IceCube and updated 90% C.L. upper limits on $langlesigma vangle$ and$Gamma_{chiightarrowuar{u}}$ using results from the Pierre AugerCollaboration and ANITA. We show that in the range $ 10^7 leq m_chi/{m GeV}leq 10^{11}$ POEMMA and GRAND10k will improve the neutrino sensitivity toparticle dark matter by factors of 2 to 10 over existing limits, whereasGRAND200k will improve this sensitivity by two orders of magnitude. In therange $10^{11} leq m_chi/{m GeV} leq 10^{15}$, POEMMA's fluorescenceobservation mode will achieve an unprecedented sensitivity to dark matterproperties. Finally, we highlight the importance of the uncertainties relatedto the dark matter distribution in the Galactic halo, using the latest fit andestimates of the Galactic parameters.
Indirect dark matter searches at ultrahigh energy neutrino detectors
Roberto Aloisio
;
2021-01-01
Abstract
High to ultrahigh energy neutrino detectors can uniquely probe the propertiesof dark matter $chi$ by searching for the secondary products produced throughannihilation and/or decay processes. We evaluate the sensitivities to darkmatter thermally averaged annihilation cross section $langlesigma vangle$and partial decay width into neutrinos $Gamma_{chiightarrowuar{u}}$(in the mass scale $10^7 leq m_chi/{m GeV} leq 10^{15}$) for nextgeneration observatories like POEMMA and GRAND. We show that in the range $10^7 leq m_chi/{m GeV} leq 10^{11}$, space-based Cherenkov detectors likePOEMMA have the advantage of full-sky coverage and rapid slewing, enabling anoptimized dark matter observation strategy focusing on the Galactic center. Wealso show that ground-based radio detectors such as GRAND can achieve highsensitivities and high duty cycles in radio quiet areas. We compare thesensitivities of next generation neutrino experiments with existing constraintsfrom IceCube and updated 90% C.L. upper limits on $langlesigma vangle$ and$Gamma_{chiightarrowuar{u}}$ using results from the Pierre AugerCollaboration and ANITA. We show that in the range $ 10^7 leq m_chi/{m GeV}leq 10^{11}$ POEMMA and GRAND10k will improve the neutrino sensitivity toparticle dark matter by factors of 2 to 10 over existing limits, whereasGRAND200k will improve this sensitivity by two orders of magnitude. In therange $10^{11} leq m_chi/{m GeV} leq 10^{15}$, POEMMA's fluorescenceobservation mode will achieve an unprecedented sensitivity to dark matterproperties. Finally, we highlight the importance of the uncertainties relatedto the dark matter distribution in the Galactic halo, using the latest fit andestimates of the Galactic parameters.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
