Leptogenesis scenarios for natural SUSY with mixed axion-higgsino dark matter

Bae, Kyu Jung; Baer, Howard A.; Serce, Hasan; Zhang, Yi-Fan

doi:10.1088/1475-7516/2016/01/012

Title: Leptogenesis scenarios for natural SUSY with mixed axion-higgsino dark matter

Journal Article · Thu Jan 07 00:00:00 EST 2016 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2016/01/012· OSTI ID:1777473

Bae, Kyu Jung ^[1];

^[2]; Serce, Hasan ^[2]; Zhang, Yi-Fan ^[2]

Univ. of Oklahoma, Norman, OK (United States); Univ. of Tokyo (Japan)
Univ. of Oklahoma, Norman, OK (United States)

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 << m_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 T_R vs. m_3/2 plane allowed by BBN, dark matter and dark radiation constraints for various PQ scale choices f_a. 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 f_a_~ 10¹⁰–10¹² GeV which is also favored by naturalness: f_a ~ √μM_P/λ_μ ~ 10¹⁰–10¹² GeV . These f_a values correspond to axion masses somewhat above the projected ADMX search regions.

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Research Organization:: Univ. of Oklahoma, Norman, OK (United States)

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

Grant/Contract Number:: SC0009956

OSTI ID:: 1777473

Report Number(s):: arXiv:1510.00724; TRN: US2209469

Journal Information:: Journal of Cosmology and Astroparticle Physics, Vol. 2016, Issue 01; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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Revisiting the SUSY $μ$ problem and its solutions in the LHC era Bae, Kyu Jung; Baer, Howard; Barger, Vernon Physical Review D, Vol. 99, Issue 11 https://doi.org/10.1103/physrevd.99.115027	journal	June 2019

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