CTA and SWGO can discover Higgsino dark matter annihilation

Rodd, Nicholas L.; Safdi, Benjamin R.; Xu, Weishuang Linda

doi:10.1103/PhysRevD.110.043003

Title: CTA and SWGO can discover Higgsino dark matter annihilation

Journal Article · 02 August 2024 · Physical Review. D.

DOI: https://doi.org/10.1103/PhysRevD.110.043003 · OSTI ID:2473504

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Thermal Higgsino dark matter (DM), with a mass near 1.1 TeV, is one of the most well-motivated and untested DM candidates. Leveraging recent hydrodynamic cosmological simulations that give DM density profiles in Milky Way analog galaxies we show that the linelike gamma-ray signal predicted from Higgsino annihilation in the Galactic Center could be detected at high significance with the upcoming Cherenkov Telescope Array (CTA) and Southern Wide-field Gamma-ray Observatory (SWGO) for all but the most pessimistic DM profiles. We perform the most sensitive search to-date for the linelike signal using 15 years of data from the Fermi Large Area Telescope, coming within an order one factor of the necessary sensitivity to detect the Higgsino for some Milky Way analog DM density profiles. We show that H.E.S.S. has subleading sensitivity relative to Fermi for the Higgsino at present. In contrast, we analyze H.E.S.S. inner Galaxy data for the thermal wino model with a mass near 2.8 TeV; we find no evidence for a DM signal and exclude the wino by over a factor of two in cross section for all DM profiles considered. In the process, we identify and attempt to correct what appears to be an inconsistency in previous H.E.S.S. inner Galaxy analyses for DM annihilation related to the analysis effective area, which may weaken the DM cross-section sensitivity claimed in those works by around an order of magnitude. Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-05CH11231; SC0019225

OSTI ID:: 2473504

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 4 Vol. 110; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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TASI Lectures on the Particle Physics and Astrophysics of Dark Matter Safdi, Benjamin Proceedings of 2022 Theoretical Advanced Study Institute in Particle Theory — PoS(TASI2022) https://doi.org/10.22323/1.439.0009	conference	January 2024
SEARCHING FOR DARK MATTER ANNIHILATION IN RECENTLY DISCOVERED MILKY WAY SATELLITES WITH FERMI -LAT Albert, A.; Anderson, B.; Bechtol, K. The Astrophysical Journal, Vol. 834, Issue 2 https://doi.org/10.3847/1538-4357/834/2/110	journal	January 2017
Observation of the Crab Nebula with the HAWC Gamma-Ray Observatory Abeysekara, A. U.; Albert, A.; Alfaro, R. The Astrophysical Journal, Vol. 843, Issue 1 https://doi.org/10.3847/1538-4357/aa7555	journal	June 2017
Was There a 3.5 keV Line? Dessert, Christopher; Foster, Joshua W.; Park, Yujin The Astrophysical Journal, Vol. 964, Issue 2 https://doi.org/10.3847/1538-4357/ad2612	journal	March 2024

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