Scalar dark matter, type II seesaw and the DAMPE cosmic ray e++e− excess

Li, Tong; Okada, Nobuchika; Shafi, Qaisar

doi:10.1016/j.physletb.2018.02.006

Title: Scalar dark matter, type II seesaw and the DAMPE cosmic ray e++e− excess

Journal Article · Sun Apr 01 00:00:00 EDT 2018 · Physics Letters B

DOI:https://doi.org/10.1016/j.physletb.2018.02.006· OSTI ID:1437823

Li, Tong; Okada, Nobuchika; Shafi, Qaisar

The DArk Matter Particle Explorer (DAMPE) has reported a measurement of the flux of high energy cosmic ray electrons plus positrons (CREs) in the energy range between $25 GeV$ and $4.6 TeV$ . With unprecedented high energy resolution, the DAMPE data exhibit an excess of the CREs flux at an energy of around $1.4 TeV$ . In this letter, we discuss how the observed excess can be understood in a minimal framework where the Standard Model (SM) is supplemented by a stable SM singlet scalar as dark matter (DM) and type II seesaw for generating the neutrino mass matrix. In our framework, a pair of DM particles annihilates into a pair of the SM SU(2) triplet scalars (Δs) in type II seesaw, and the subsequent Δ decays create the primary source of the excessive CREs around $1.4 TeV$ . The lepton flavor structure of the primary source of CREs has a direct relation with the neutrino oscillation data. We find that the DM interpretation of the DAMPE excess determines the pattern of neutrino mass spectrum to be the inverted hierarchy type, taking into account the constraints from the Fermi-LAT observations of dwarf spheroidal galaxies.

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Research Organization:: Univ. of Alabama, Tuscaloosa, AL (United States); Univ. of Delaware, Newark, DE (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0013680; SC0013880

OSTI ID:: 1437823

Alternate ID(s):: OSTI ID: 1499149

Journal Information:: Physics Letters B, Journal Name: Physics Letters B Vol. 779 Journal Issue: C; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: Netherlands

Language:: English

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Cited by: 27 works

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