Explaining the AMS positron excess via Right-handed Neutrinos. (arXiv:1910.04782v1 [hep-ph])
<a href="http://arxiv.org/find/hep-ph/1/au:+Queiroz_F/0/1/0/all/0/1">Farinaldo S. Queiroz</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Siqueira_C/0/1/0/all/0/1">Clarissa Siqueira</a>
We have witnessed in the past decade the observation of a puzzling cosmic-ray
excess at energies larger than $10$~GeV. The AMS-02 data published this year
has new ingredients such as the bump around $300$~GeV followed by a drop at
$800$~GeV, as well as smaller error bars. Adopting the background used by the
AMS-02 collaboration in their analysis, one can conclude that previous
explanations to the new AMS-02 such as one component annihilating and decaying
dark matter as well as pulsars seem to fail at reproducing the data. Here, we
show that in the right-handed neutrino portal might reside the answer. We
discuss a decaying two-component dark matter scenario where the decay products
are right-handed neutrinos that have their decay pattern governed by the type I
seesaw mechanism. This setup provides a very good fit to data, for example, for
a conservative approach including just statistical uncertainties leads to
$chi^2/d.o.f sim 2.3$ for $m_{DM_1}=2150$~GeV with $tau_{1}=3.78 times
10^{26}$ s and $m_{DM_2}=300$ with $tau_{2}=5.0 times 10^{27}$ s for $M_N=10$
GeV, and, in an optimistic case, including systematic uncertainties, we find
$chi^2/d.o.f sim 1.12$, for $M_N = 10$ GeV, with $m_{DM_1}=2200$ GeV with
$tau_{1}=3.8 times 10^{26}$ s and $m_{DM_2}=323$ GeV with $tau_{2}=1.68
times 10^{27}$ s.
We have witnessed in the past decade the observation of a puzzling cosmic-ray
excess at energies larger than $10$~GeV. The AMS-02 data published this year
has new ingredients such as the bump around $300$~GeV followed by a drop at
$800$~GeV, as well as smaller error bars. Adopting the background used by the
AMS-02 collaboration in their analysis, one can conclude that previous
explanations to the new AMS-02 such as one component annihilating and decaying
dark matter as well as pulsars seem to fail at reproducing the data. Here, we
show that in the right-handed neutrino portal might reside the answer. We
discuss a decaying two-component dark matter scenario where the decay products
are right-handed neutrinos that have their decay pattern governed by the type I
seesaw mechanism. This setup provides a very good fit to data, for example, for
a conservative approach including just statistical uncertainties leads to
$chi^2/d.o.f sim 2.3$ for $m_{DM_1}=2150$~GeV with $tau_{1}=3.78 times
10^{26}$ s and $m_{DM_2}=300$ with $tau_{2}=5.0 times 10^{27}$ s for $M_N=10$
GeV, and, in an optimistic case, including systematic uncertainties, we find
$chi^2/d.o.f sim 1.12$, for $M_N = 10$ GeV, with $m_{DM_1}=2200$ GeV with
$tau_{1}=3.8 times 10^{26}$ s and $m_{DM_2}=323$ GeV with $tau_{2}=1.68
times 10^{27}$ s.
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