| DATE: |
2014-01-28 11:00 - 12:00 |
| PLACE: |
Kenkyu Honkan 1F meeting room 3 |
| TITLE: |
Majorana neutrinos and multi-component Dark Matter Model from AMS-02 Result. |
| CONTACT: |
Tetsutaro Higaki,thigakiˇĽAT-post.kek.jp |
| SPEAKER: |
Dr. Lu-Hsing Tsai (NTHU, Taiwan) |
| LANGUAGE: |
English |
| ABSTRACT: |
Recently AMS-02 gives the most accurate measurement of positron fraction in cosmic rays. The traditional astrophysical sources can not explain the excess above 10 GeV in both spectrums of total fluxes of electron/ positron by Fermi-LAT and positron fraction by AMS-02. The extra contribution from dark matter decay or annihilation could provide a promising explanation. In this talk I will show how to simultaneously explain the anomalies of Fermi-LAT and AMS-02 results by a decaying dark matter model with two dark matter components, each of which has two-body leptonic decays as the main channels. In such scenarios there also exist substructures in these spectrums. This model satisfies the constraints by the observation of diffuse gamma-rays by Fermi-LAT. We also show that heavy Majorana neutrinos could be a possible candidate for dark matter in this scenario. |
