Supersymmetric models with radiatively-driven electroweak naturalness require light higgsinos of mass ~ 100–300 GeV . Naturalness in the QCD sector is invoked via the Peccei-Quinn (PQ) axion leading to mixed axion-higgsino dark matter. The SUSY DFSZ axion model provides a solution to the SUSY μ problem and the Little Hierarchy μL << m3/2 may emerge as a consequence of a mismatch between PQ and hidden sector mass scales. The traditional gravitino problem is now augmented by the axino and saxion problems, since these latter particles can also contribute to overproduction of WIMPs or dark radiation, or violation of BBN constraints. We compute regions of the TR vs. m3/2 plane allowed by BBN, dark matter and dark radiation constraints for various PQ scale choices fa. These regions are compared to the values needed for thermal leptogenesis, non-thermal leptogenesis, oscillating sneutrino leptogenesis and Affleck-Dine leptogenesis. The latter three are allowed in wide regions of parameter space for PQ scale fa~ 1010–1012 GeV which is also favored by naturalness: fa ~ √μMP/λμ ~ 1010–1012 GeV . These fa values correspond to axion masses somewhat above the projected ADMX search regions.
Bae, Kyu Jung, et al. "Leptogenesis scenarios for natural SUSY with mixed axion-higgsino dark matter." Journal of Cosmology and Astroparticle Physics, vol. 2016, no. 01, Jan. 2016. https://doi.org/10.1088/1475-7516/2016/01/012
Bae, Kyu Jung, Baer, Howard A., Serce, Hasan, & Zhang, Yi-Fan (2016). Leptogenesis scenarios for natural SUSY with mixed axion-higgsino dark matter. Journal of Cosmology and Astroparticle Physics, 2016(01). https://doi.org/10.1088/1475-7516/2016/01/012
Bae, Kyu Jung, Baer, Howard A., Serce, Hasan, et al., "Leptogenesis scenarios for natural SUSY with mixed axion-higgsino dark matter," Journal of Cosmology and Astroparticle Physics 2016, no. 01 (2016), https://doi.org/10.1088/1475-7516/2016/01/012
@article{osti_1777473,
author = {Bae, Kyu Jung and Baer, Howard A. and Serce, Hasan and Zhang, Yi-Fan},
title = {Leptogenesis scenarios for natural SUSY with mixed axion-higgsino dark matter},
annote = {Supersymmetric models with radiatively-driven electroweak naturalness require light higgsinos of mass ~ 100–300 GeV . Naturalness in the QCD sector is invoked via the Peccei-Quinn (PQ) axion leading to mixed axion-higgsino dark matter. The SUSY DFSZ axion model provides a solution to the SUSY μ problem and the Little Hierarchy μL 3/2 may emerge as a consequence of a mismatch between PQ and hidden sector mass scales. The traditional gravitino problem is now augmented by the axino and saxion problems, since these latter particles can also contribute to overproduction of WIMPs or dark radiation, or violation of BBN constraints. We compute regions of the TR vs. m3/2 plane allowed by BBN, dark matter and dark radiation constraints for various PQ scale choices fa. These regions are compared to the values needed for thermal leptogenesis, non-thermal leptogenesis, oscillating sneutrino leptogenesis and Affleck-Dine leptogenesis. The latter three are allowed in wide regions of parameter space for PQ scale fa~ 1010–1012 GeV which is also favored by naturalness: fa ~ √μMP/λμ ~ 1010–1012 GeV . These fa values correspond to axion masses somewhat above the projected ADMX search regions.},
doi = {10.1088/1475-7516/2016/01/012},
url = {https://www.osti.gov/biblio/1777473},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {ISSN 1475-7516},
number = {01},
volume = {2016},
place = {United States},
publisher = {Institute of Physics (IOP)},
year = {2016},
month = {01}}
PARTICLE PHYSICS AND COSMOLOGY: Third Tropical Workshop on Particle Physics and Cosmology - Neutrinos, Branes, and Cosmology, AIP Conference Proceedingshttps://doi.org/10.1063/1.1543501