Universal extra dimensions
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Universal Extra Dimensions. Universal Extra Dimensions. All Standard Model fields propagate into the bulk, typically 1 or 2 extra dimensions. Momentum conservation principle manifests as a conservation of a parity at each vertex – KK parity Naturally provides a Dark Matter candidate

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Universal Extra Dimensions

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Universal extra dimensions

Universal Extra Dimensions


Universal extra dimensions1

Universal Extra Dimensions

  • All Standard Model fields propagate into the bulk, typically 1 or 2 extra dimensions.

  • Momentum conservation principle manifests as a conservation of a parity at each vertex – KK parity

    • Naturally provides a Dark Matter candidate

  • Excited modes mimic Standard Model zero modes.

  • Minimal number of extra parameters

    • R, Λ and mH


Toy derivation of scalar lagrangian

Toy derivation of scalar Lagrangian

  • Heuristic derivation showing how mass terms appear – infinite tower of KK modes


Dark matter candidates analysis by servant tait

Dark Matter CandidatesAnalysis by Servant & Tait

  • Neutral Weak Gauge Boson B1

    • Strongest CDM candidate

  • Neutrino

    • disfavored by present limits from direct detection experiments


Why b 1

Why B(1)?

  • The mass matrix that governs the mixing between the neutral weak gauge bosons is

  • The B(1) is mostly photon


What s involved

What’s involved?

  • If UED theories are incorrect, the LHC will be able to exclude them in their present form.

    • Cosmological constraints place R within the reach of LHC energies.

  • Confirmation of the theory will require more extensive statistics, because SUSY will have the same signature(s) as UEDs within the statistical reach, at the KK1 level.

  • Require higher statistics → better angular resolution of decay products → spin determination

  • Correlation with cosmological experiments

  • Require resolution of higher KK modes for model resolution


Servant tait prediction for b 1 h 2

Servant, TaitPrediction for ΩB(1)h2

  • hep-ph/0206071

  • Graph plotted in 2002 – slightly outdated

  • Lower band should span 0.09 to 0.13 corresponding to m = 750 - 950 GeV, using latest WMAP results


Requirements for dark matter candidacy

Requirements for Dark Matter Candidacy

  • There must exist a stability mechanism

    • KK Parity conservation

  • Electrically neutral

    • Charged particles could interact with zero mode, and we would have seen them

  • Coannihilation


Lightest kaluza klein particle lkp

Lightest Kaluza-Klein Particle (LKP)

  • Stable by virtue of KK parity conservation

  • All heavier odd-mode particles eventually annihilate/decay into the LKP

  • KK parity conserved at all levels


Radiative corrections to masses at lower limit of r

radiative corrections to massesat lower limit of R

  • Weak gauge boson masses receive almost no correction

  • Lepton mass correction are a few percent

  • Gluons & quark masses receive large corrections


Radiative corrections to masses at upper limit of r

radiative corrections to massesat upper limit of R

  • Weak gauge boson masses receive almost no correction

  • Lepton mass correction are a few percent

  • Gluons & quark masses receive large corrections, but smaller than with smaller R


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