Speaker
Description
We review a dark matter scenario [1-6] which is consistent with recent analyses of observations from Fermi-LAT, AMS-02, and Planck. In this scenario, with both supersymmetry and an extended Higgs sector, the mass of the dominant dark matter WIMP is rigorously ≤ 125 GeV/c$^2$, its gauge couplings are precisely defined, and its Higgs-mediated couplings should be comparable to those of a neutralino. Very recent and earlier analyses of the data from Planck, Fermi-LAT, AMS-02, and other experiments indicate that (i) the positron excess at $\sim$ 800 GeV or above is not evidence of high-mass dark matter particles (which would have disconfirmed the present theory), (ii) the Galactic center excess of gamma rays observed by Fermi-LAT may be evidence for dark matter particles with a mass near or below 100 GeV, (iii) the gamma-ray excess from Omega Centauri may provide similar evidence of annihilation of such relatively low-mass particles, and (iv) the antiproton excess observed by AMS is again possible evidence of roughly 100 GeV dark matter particles. The present scenario, with two stable spin 1/2 WIMPs (a high-mass neutralino and a more abundant "Higgson") is consistent with these results, and it also suggests that true detection should be near in direct, indirect, or collider detection experiments.
[1] R. E. Allen and A. Saha, Mod. Phys. Lett. A 32, 1730022 (2017), arXiv:1706.00882 [hep-ph].
[2] Roland E. Allen, Phys. Scr. 94, 014010 (2019), arXiv:1811.00670 [hep-ph].
[3] Maxwell Throm, Reagan Thornberry, John Killough, Brian Sun, Gentill Abdulla, and Roland Allen, Mod. Phys. Lett. A 34, 1930001 (2019), arXiv:1901.02781 [hep-ph].
[4] Reagan Thornberry, Maxwell Throm, John Killough, Dylan Blend, Michael Erickson, Brian Sun, Brett Bays, Gabe Frohaug, and Roland E. Allen, submitted.
[5] Reagan Thornberry, Alejandro Arroyo, Caden LaFontaine, Gabriel Frohaug, Dylan Blend, and Roland E. Allen, eConf: The SLAC Electronic Conference Proceedings Archive, arXiv:1910.09950.
[6] Dylan Blend, Reagan Thornberry, Alejandro Arroyo, Gabriel Frohaug, Caden LaFontaine, and Roland E. Allen, proceedings of European Physical Society High Energy Physics Conference.
