Neutrino Mass and Dark Matter in Light of Recent AMS-02 Results

Show simple item record Okada, Nobuchika 2019-05-16T19:10:59Z 2019-05-16T19:10:59Z 2014-05-02 en_US
dc.description.abstract We study a simple extension of the Standard Model supplemented by an electroweak triplet scalar field to accommodate small neutrino masses by the type-II seesaw mechanism, while an additional singlet scalar field can play the role of cold dark matter (DM) in our Universe. This DM candidate is leptophilic for a wide range of model parameter space, and the lepton flux due to its annihilation carries information about the neutrino mass hierarchy. Using the recently released high-precision data on positron fraction and flux from the AMS-02 experiment, we examine the DM interpretation of the observed positron excess in our model for two kinematically distinct scenarios with the DM and triplet scalar masses (a) nondegenerate (m⌄(DM) ≫ m⌄Δ) and (b) quasidegenerate (m⌄(DM) ≃ m⌄ Δ). We find that a good fit to the AMS-02 data can be obtained in both cases (a) and (b) with a normal hierarchy of neutrino masses, while the inverted hierarchy case is somewhat disfavored. Although we require a larger boost factor for the normal hierarchy case, this is still consistent with the current upper limits derived from Fermi-LAT and IceCube data for case (a). Moreover, the absence of an excess antiproton flux as suggested by PAMELA data sets an indirect upper limit on the DM-nucleon spin-independent elastic scattering cross section, which is stronger than the existing DM direct detection bound from LUX in the AMS-02 preferred DM mass range. en_US
dc.format.mimetype application/pdf en_US
dc.language English en_US
dc.subject Extensions of electroweak Higgs sector en_US
dc.subject Neutrino mass and mixing en_US
dc.subject Other charged Higgs bosons en_US
dc.subject Cosmic rays (including sources, origin, acceleration, and interactions) en_US
dc.title Neutrino Mass and Dark Matter in Light of Recent AMS-02 Results en_US
dc.type text en_US

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