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Title: Hot leptogenesis from thermal Dark Matter

In this work, we investigate a scenario in which heavy Majorana Right-Handed Neutrinos (RHNs) are in thermal equilibrium with a dark sector with temperature higher than the Standard Model (SM) thermal bath. Specifically, we consider the scenario in which thermal Dark Matter (DM) abundance is fixed from the freeze-out of DM annihilations into RHNs. Due to the inert nature of the RHNs, we show that it is possible for the two sectors to remain thermally decoupled by having more than two generations of the RHNs. The hotter temperature implies higher abundances of DM and RHNs with the following consequences. For leptogenesis, an enhancement in efficiency up to a factor of 51.6 can be obtained, though a resonant enhancement of CP violation is still required due to an upper mass bound of about 4 TeV for the RHNs. For the DM, an enhanced annihilation cross section up to a factor of 51.6 is required to obtain the correct DM abundance. This scenario can be probed via indirect detection of DM annihilating into RHNs, which then decay into hν, Zν and W ± ℓ with an enhanced annihilation cross section above the typical thermal value.
Authors:
ORCiD logo [1] ; ORCiD logo [2]
  1. Univ. Antonio Narino, Bogota (Columbia)
  2. Univ. de Sao Paulo, Sao Paulo (Brazil); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States). Theoretical Physics Dept.
Publication Date:
Report Number(s):
PI-UAN-2017-608FT; FERMILAB-PUB-17-342-T; arXiv:1707.02988
Journal ID: ISSN 1475-7516; 1609454
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2017; Journal Issue: 10; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; baryon asymmetry; dark matter theory; leptogenesis; neutrino masses from cosmology
OSTI Identifier:
1434946

Bernal, Nicolas, and Fong, Chee Sheng. Hot leptogenesis from thermal Dark Matter. United States: N. p., Web. doi:10.1088/1475-7516/2017/10/042.
Bernal, Nicolas, & Fong, Chee Sheng. Hot leptogenesis from thermal Dark Matter. United States. doi:10.1088/1475-7516/2017/10/042.
Bernal, Nicolas, and Fong, Chee Sheng. 2017. "Hot leptogenesis from thermal Dark Matter". United States. doi:10.1088/1475-7516/2017/10/042. https://www.osti.gov/servlets/purl/1434946.
@article{osti_1434946,
title = {Hot leptogenesis from thermal Dark Matter},
author = {Bernal, Nicolas and Fong, Chee Sheng},
abstractNote = {In this work, we investigate a scenario in which heavy Majorana Right-Handed Neutrinos (RHNs) are in thermal equilibrium with a dark sector with temperature higher than the Standard Model (SM) thermal bath. Specifically, we consider the scenario in which thermal Dark Matter (DM) abundance is fixed from the freeze-out of DM annihilations into RHNs. Due to the inert nature of the RHNs, we show that it is possible for the two sectors to remain thermally decoupled by having more than two generations of the RHNs. The hotter temperature implies higher abundances of DM and RHNs with the following consequences. For leptogenesis, an enhancement in efficiency up to a factor of 51.6 can be obtained, though a resonant enhancement of CP violation is still required due to an upper mass bound of about 4 TeV for the RHNs. For the DM, an enhanced annihilation cross section up to a factor of 51.6 is required to obtain the correct DM abundance. This scenario can be probed via indirect detection of DM annihilating into RHNs, which then decay into hν, Zν and W± ℓ∓ with an enhanced annihilation cross section above the typical thermal value.},
doi = {10.1088/1475-7516/2017/10/042},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 10,
volume = 2017,
place = {United States},
year = {2017},
month = {10}
}