PAMELA/ATIC anomaly from the meta-stable extra dark matter component and the leptophilic Yukawa interaction
- Department of Physics and Astronomy and Center for Theoretical Physics, Seoul National University, Seoul 151-747 (Korea, Republic of)
We present a supersymmetric model with two dark matter (DM) components explaining the galactic positron excess observed by PAMELA/HEAT and ATIC/PPB-BETS: One is the conventional (bino-like) lightest supersymmetric particle (LSP) χ, and the other is a TeV scale meta-stable neutral singlet N{sub D}, which is a Dirac fermion (N,N{sup c}). In this model, N{sub D} decays dominantly into χe{sup +}e{sup −} through an R parity preserving dimension 6 operator with the life time τ{sub N} ∼ 10{sup 26} sec. We introduce a pair of vector-like superheavy SU(2) lepton doublets (L,L{sup c}) and lepton singlets (E,E{sup c}). The dimension 6 operator leading to the N{sub D} decay is generated from the leptophilic Yukawa interactions by W superset of Ne{sup c}E+Lh{sub d}E{sup c}+m{sub 3/2}l{sub 1}L{sup c} with the dimensionless couplings of order unity, and the gauge interaction by L superset of (2){sup 1/2}g' e-tilde {sup c*}e{sup c}χ+h.c. The superheavy masses of the vector-like leptons (M{sub L},M{sub E} ∼ 10{sup 16} GeV) are responsible for the longevity of N{sub D}. The low energy field spectrum in this model is just the MSSM fields and N{sub D}. Even for the case that the portion of N{sub D} is much smaller than that of χ in the total DM density [O(10{sup −10}) ∼< n{sub N{sub D}}/n{sub χ}], the observed positron excess can be explained by adopting relatively lighter masses of the vector-like leptons (10{sup 13} GeV ∼< M{sub L,E} ∼< 10{sup 16} GeV). The smallness of the electron mass is also explained. This model is easily embedded in the flipped SU(5) grand unification, which is a leptophilic unified theory.
- OSTI ID:
- 22273194
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2009, Issue 07; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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