Lepto-axiogenesis and the scale of supersymmetry. (arXiv:2208.07878v1 [hep-ph])
<a href="http://arxiv.org/find/hep-ph/1/au:+Barnes_P/0/1/0/all/0/1">Patrick Barnes</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Co_R/0/1/0/all/0/1">Raymond T. Co</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Harigaya_K/0/1/0/all/0/1">Keisuke Harigaya</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Pierce_A/0/1/0/all/0/1">Aaron Pierce</a>

If the Peccei-Quinn field containing the QCD axion undergoes rotations in the
early universe, the dimension-five operator responsible for neutrino masses can
generate a lepton asymmetry that ultimately gives rise to the observed baryon
asymmetry of the Universe. This lepto-axiogenesis scenario requires a flat
potential for the radial direction of the Peccei-Quinn field, naturally
realized in supersymmetric models. We carefully compute the efficiency of this
mechanism for the Dine-Fischler-Srednicki-Zhitnitsky (DFSZ) and
Kim-Shifman-Vainshtein-Zakharov (KSVZ) axion models and place lower bounds on
the masses of scalar superpartners required to reproduce the observed baryon
asymmetry. For the KSVZ model, we find an efficiency for generation of the
asymmetry six times larger than the previously extant computation after
including scattering channels involving superpartners. In this case, the
superpartner scale should be above $sim$ 30 TeV for a domain wall number of
one; the lower bound weakens for larger domain wall numbers. We find that the
superpartner mass scale may be as low as 5 TeV for the DFSZ model. In all
cases, the lower bound on the superpartner masses is inversely proportional to
the neutrino mass and so can strengthen as the upper bound on the neutrino mass
improves. We identify the parameter space where the axion rotation can
simultaneously produce axion dark matter via kinetic misalignment; in this case
it is possible to put an upper bound of order 300 TeV on the masses of scalar
superpartners.

If the Peccei-Quinn field containing the QCD axion undergoes rotations in the
early universe, the dimension-five operator responsible for neutrino masses can
generate a lepton asymmetry that ultimately gives rise to the observed baryon
asymmetry of the Universe. This lepto-axiogenesis scenario requires a flat
potential for the radial direction of the Peccei-Quinn field, naturally
realized in supersymmetric models. We carefully compute the efficiency of this
mechanism for the Dine-Fischler-Srednicki-Zhitnitsky (DFSZ) and
Kim-Shifman-Vainshtein-Zakharov (KSVZ) axion models and place lower bounds on
the masses of scalar superpartners required to reproduce the observed baryon
asymmetry. For the KSVZ model, we find an efficiency for generation of the
asymmetry six times larger than the previously extant computation after
including scattering channels involving superpartners. In this case, the
superpartner scale should be above $sim$ 30 TeV for a domain wall number of
one; the lower bound weakens for larger domain wall numbers. We find that the
superpartner mass scale may be as low as 5 TeV for the DFSZ model. In all
cases, the lower bound on the superpartner masses is inversely proportional to
the neutrino mass and so can strengthen as the upper bound on the neutrino mass
improves. We identify the parameter space where the axion rotation can
simultaneously produce axion dark matter via kinetic misalignment; in this case
it is possible to put an upper bound of order 300 TeV on the masses of scalar
superpartners.

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