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Title: Type II seesaw mechanism with scalar dark matter in light of AMS-02, DAMPE, and Fermi-LAT data

Abstract

The standard model (SM) supplemented by type II seesaw and a SM gauge-singlet scalar dark matter (DM) is a very simple framework to incorporate the observed neutrino oscillations and provide a plausible DM candidate. In this framework, the scalar DM naturally has a leptophilic nature with a pair annihilating mainly into the SM SU(2) L triplet Higgs scalar of type II Seesaw which, in turn, decay into leptons. In this work, we consider indirect signatures of this leptophilic DM and examine the spectrum of the cosmic ray electron/positron flux from DM pair annihilations in the Galactic halo. Given an astrophysical background spectrum of the cosmic ray electron/positron flux, we find that the contributions from DM annihilations can nicely fit the observed data from the AMS-02, DAMPE and Fermi-LAT collaborations, with a multi-TeV range of DM mass and a boost factor for the DM annihilation cross section of $$\mathscr{O}$$(1000). The boost factor has a tension with the Fermi-LAT data for gamma-ray from dwarf spheroidal galaxies and the limit from CMB anisotropies, which can be ameliorated with enhanced local DM density by a factor of about two.

Authors:
; ;
Publication Date:
Research Org.:
Univ. of Alabama, Tuscaloosa, AL (United States); Univ. of Delaware, Newark, DE (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1468498
Alternate Identifier(s):
OSTI ID: 1503883
Grant/Contract Number:  
[SC0012447; SC0013880]
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
[Journal Name: Physical Review D Journal Volume: 98 Journal Issue: 5]; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Li, Tong, Okada, Nobuchika, and Shafi, Qaisar. Type II seesaw mechanism with scalar dark matter in light of AMS-02, DAMPE, and Fermi-LAT data. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.98.055002.
Li, Tong, Okada, Nobuchika, & Shafi, Qaisar. Type II seesaw mechanism with scalar dark matter in light of AMS-02, DAMPE, and Fermi-LAT data. United States. doi:10.1103/PhysRevD.98.055002.
Li, Tong, Okada, Nobuchika, and Shafi, Qaisar. Tue . "Type II seesaw mechanism with scalar dark matter in light of AMS-02, DAMPE, and Fermi-LAT data". United States. doi:10.1103/PhysRevD.98.055002.
@article{osti_1468498,
title = {Type II seesaw mechanism with scalar dark matter in light of AMS-02, DAMPE, and Fermi-LAT data},
author = {Li, Tong and Okada, Nobuchika and Shafi, Qaisar},
abstractNote = {The standard model (SM) supplemented by type II seesaw and a SM gauge-singlet scalar dark matter (DM) is a very simple framework to incorporate the observed neutrino oscillations and provide a plausible DM candidate. In this framework, the scalar DM naturally has a leptophilic nature with a pair annihilating mainly into the SM SU(2)L triplet Higgs scalar of type II Seesaw which, in turn, decay into leptons. In this work, we consider indirect signatures of this leptophilic DM and examine the spectrum of the cosmic ray electron/positron flux from DM pair annihilations in the Galactic halo. Given an astrophysical background spectrum of the cosmic ray electron/positron flux, we find that the contributions from DM annihilations can nicely fit the observed data from the AMS-02, DAMPE and Fermi-LAT collaborations, with a multi-TeV range of DM mass and a boost factor for the DM annihilation cross section of $\mathscr{O}$(1000). The boost factor has a tension with the Fermi-LAT data for gamma-ray from dwarf spheroidal galaxies and the limit from CMB anisotropies, which can be ameliorated with enhanced local DM density by a factor of about two.},
doi = {10.1103/PhysRevD.98.055002},
journal = {Physical Review D},
number = [5],
volume = [98],
place = {United States},
year = {2018},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1103/PhysRevD.98.055002

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