PAMELA-ATIC anomaly from the meta-stable extra dark matter component and the leptophilic Yukawa interaction - High Energy Physics - PhenomenologyReport as inadecuate




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Abstract: We present a supersymmetric model with two dark matter DM componentsexplaining the galactic positron excess observed by PAMELA-HEAT andATIC-PPB-BETS: One is the conventional bino-like lightest supersymmetricparticle LSP \chi, and the other is a TeV scale meta-stable neutral singletN D, which is a Dirac fermion N,N^c. In this model, N D decays dominantlyinto \chi e^+e^- through an R parity preserving dimension 6 operator with thelife time \tau N\sim 10^{26} sec. We introduce a pair of vector-like superheavySU2 lepton doublets L,L^c and lepton singlets E,E^c. The dimension 6operator leading to the N D decay is generated from the leptophilic Yukawainteractions by W\supset Ne^cE+Lh dE^c+m {3-2}l 1L^c with the dimensionlesscouplings of order unity, and the gauge interaction by {\cal L}\supset \sqrt{2}g-\tilde{e}^{c*}e^c\chi + h.c. The superheavy masses of the vector-like leptonsM L, M E\sim 10^{16} GeV are responsible for the longevity of N D. The lowenergy field spectrum in this model is just the MSSM fields and N D. Even forthe case that the portion of N D is much smaller than that of \chi in the totalDM density {\cal O}10^{-10} \lesssim n {N D}-n \chi, the observed positronexcess can be explained by adopting relatively lighter masses of thevector-like leptons 10^{13} GeV \lesssim M {L,E} \lesssim 10^{16} GeV. Thesmallness of the electron mass is also explained. This model is easily embeddedin the flipped SU5 grand unification, which is a leptophilic unified theory.



Author: Bumseok Kyae

Source: https://arxiv.org/







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