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Full-Text Articles in Physical Sciences and Mathematics
Pamela Positron Excess As A Signal From The Hidden Sector, Daniel Feldman, Zuowei Liu, Pran Nath
Pamela Positron Excess As A Signal From The Hidden Sector, Daniel Feldman, Zuowei Liu, Pran Nath
Pran Nath
The recent positron excess observed in the PAMELA satellite experiment strengthens previous experimental findings. We give here an analysis of this excess in the framework of the Stueckelberg extension of the standard model which includes an extra U(1)ₓ gauge field and matter in the hidden sector. Such matter can produce the right amount of dark matter consistent with the Wilkinson Microwave Anisotropy Probe (WMAP) constraints. Assuming the hidden sector matter to be Dirac fermions it is shown that their annihilation can produce the positron excess with the right positron energy dependence seen in the HEAT, AMS, and the PAMELA experiments. …
Higgsino Dark Matter Model Consistent With Galactic Cosmic Ray Data And Possibility Of Discovery At Lhc-7, Ning Chen, Daniel Feldman, Zuowei Liu, Pran Nath, Gregory Peim
Higgsino Dark Matter Model Consistent With Galactic Cosmic Ray Data And Possibility Of Discovery At Lhc-7, Ning Chen, Daniel Feldman, Zuowei Liu, Pran Nath, Gregory Peim
Pran Nath
A solution to the PAMELA positron excess with Higgsino dark matter within extended supergravity grand unified (SUGRA) models is proposed. The models are compliant with the photon constraints recently set by Fermi-LAT and produce positron as well as antiproton fluxes consistent with the PAMELA experiment. The SUGRA models considered have an extended hidden sector with extra degrees of freedom which allow for a satisfaction of relic density consistent with WMAP. The Higgsino models are also consistent with the CDMS-II and XENON100 data and are discoverable at LHC-7 with 1 fb⁻1 of luminosity. The models are testable on several fronts.
Explaining Pamela And Wmap Data Through Coannihilations In Extended Sugra With Collider Implications, Daniel Feldman, Zuowei Liu, Pran Nath, Brent D. Nelson
Explaining Pamela And Wmap Data Through Coannihilations In Extended Sugra With Collider Implications, Daniel Feldman, Zuowei Liu, Pran Nath, Brent D. Nelson
Pran Nath
The PAMELA positron excess is analyzed within the framework of nonuniversal supergravity (SUGRA) models with an extended U(1)n gauge symmetry in the hidden sector leading to neutralino dark matter with either a mixed Higgsino-wino lightest R-parity odd supersymmetric particle (LSP) or an essentially pure wino-dominated LSP. The Higgsino-wino LSP can produce the observed PAMELA positron excess and satisfy relic density constraints in the extended class of models due to a near degeneracy of the mass spectrum of the extended neutralino sector with the LSP mass. The simultaneous satisfaction of the WMAP relic density data and the PAMELA data is accomplished …