The leptonic Higgs as a messenger of dark matter

Abstract

We propose that the leptonic cosmic ray signals seen by PAMELA and ATIC result from the annihilation or decay of dark matter particles via states of a leptonic Higgs doublet to τ leptons, linking cosmic ray signals of dark matter to LHC signals of the Higgs sector. The states of the leptonic Higgs doublet are lighter than about 200 GeV, yielding largeτ τ and τ ττ τ event rates at the LHC. Simple models are given for the dark matter particle and its interactions with the leptonic Higgs, for cosmic ray signals arising from both annihilations and decays in the galactic halo. For the case of annihilations, cosmic photon and neutrino signals are on the verge of discovery.Recent observations of high-energy electron and positron cosmic ray spectra have generated tremendous interest, as they might provide the first non-gravitational evidence for Dark Matter (DM). The PAMELA [1] experiment reports an excess of positrons in the few GeV to 100 GeV range, providing further support to the earlier results of HEAT [2] and AMS [3]. In addition, results from the ATIC [4] and PPB-BETS [5] balloon experiments suggest an excess of electrons and positrons in the 300 GeV to 600 GeV range.While these observations have conventional astrophysical interpretations, they may result from annihilations or decays of DM particles in the galactic halo. Indeed, the PAMELA and ATIC data reinforce each other, since, for a certain range of DM masses, they have a unified interpretation. However, DM

Two-Higgs-doublet model in light of the standard modelH→τ+τ−search at the LHC

“…To avoid treelevel FCNC, it suffices that fermions of a given electric charge couple to no more than one leptons. Models III and IV have been explored in a number of papers [22][23][24] and more recently with a renewed interest in [25][26][27]. After EWSB, the Yukawa interactions of the neutral scalars h and A are expressed in terms of mass eigenstates as:…”

Supersymmetric model with Dirac neutrino masses

“…Of course, this question can be asked about any leptophilic model, whether supersymmetric or not. As noted earlier, there are many discussions of leptophilic models [4,5] in which the charged leptons (and the left-handed neutrino) have a different sign under the Z 2 symmetry than the quarks. It is difficult to see how to reconcile these models with grand unification, since the charged leptons and quarks are generally in the same representation.…”

“…Although the basic structure of this model was proposed long ago [4], it has received a resurgence of interest [5] due to the existence of non-zero neutrino masses.…”

Sneutrino dark matter: Symmetry protection and cosmic ray anomalies

“…Thus, one intriguing idea is that the DM carries lepton number, e.g., it is composed of right-handed scalar neutrinos (sneutrinos) in minimal [11][12][13] and extended [14][15][16] supersymmetric models. This framework might explain the preference for leptonic annihilation/decay products [17][18][19][20][21][22][23].…”