Hidden Sector Models and Signatures

Abstract

In the Stueckelberg extension of the Standard Model (StSM), matter in the hidden sector can act as dark matter. Due to an interplay of mixings produced by the usual Higgs mechanism and the Stueckelberg mechanism in the neutral gauge boson sector, the hidden sector matter acquires a milli charge. The Stueckelberg extension also produces a narrow width Z prime which is detectable at the Large Hadron Collider. The hidden sector dark matter naturally explains the PAMELA positron excess by means of a Breit-Wigner enhancement through a Z prime resonance. We also discuss the origin of milli charge in the context of the kinetic mixing and the Stueckelberg mixing.Comment: 10 pages, 8 figures, based on a talk presented at BSM-LHC 09; Boston, 2-4 June, 200

R-parity conservation via the Stueckelberg mechanism: LHC and Dark Matter Signals

“…Here the Stueckelberg sector generates two extra massive vector neutral bosons, i.e., Z ′ and Z ′′ , one of which would be very narrow and could lie even in the sub-TeV region, and thus would be accessible at the LHC. The models with massive mediators arise generally via mass mixing and kinetic mixing of Abelian gauge bosons ( [30][31][32][33][34][35][36][37][38][39][40][41][42][43]; for additional works, see [44,Chapter 8,pg. 136]) and the mixings are also the source of the so called dark forces [30,32] -the mixings allow for a portal between the hidden (dark) sector via massive mediators [30][31][32][33][34][35][36] (from which several components of dark matter can arise) and the visible sector where the states charged under the the Standard Model reside.…”

The kinetic dark-mixing in the light of CoGENT and XENON100

“…However, none of the particle of the SM has any U(1) D charges: the U(1) D can be considered has a lepto−hadrophobic Z D . Other authors in [5,24,25] or [26] have looked at hidden-valley like models or milli-charged dark matter but concentrating their study to relatively heavy Z D and large mixing angle. The authors of [21] have computed the observables from effective Peskin-Takeuchi parameters [27], and found…”

“…Extra gauge symmetries are predicted in most Grand Unified Theories (GUTs) and appear systematically in string constructions. Larger groups than SU (5) or SO (10), like E 6 allows the SM gauge group to be embedded into them. Brane-world U (1) ′ s are special compared to GUT U (1) ′ s because there is no reason for the SM particle to be charged under them.…”

“…[1]. On the other hand, recent anomalies in cosmic rays and direct detection experiments have motivated the exploration of new gauge interactions in a putative dark sector [2][3][4][5]. The new vector boson Z D can interact with the SM, even if no SM fermions are directly charged under the additional gauge symmetry.…”

Extra U(1) as natural source of a monochromatic gamma ray line

“…The Dark Matter (DM) candidate ψ 0 could be the lightest (and thus stable) particle of this secluded sector. Such a mixing has been justified in recent string constructions [18][19][20][21][22], but has also been studied within a model independent approach [23][24][25][26][27][28][29][30][31][32][33] or in a supersymmetric extension [34][35][36][37].…”