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New Ideas in Randall-Sundrum Phenomenology. José Santiago Theory Group (FNAL). The goods and the bads of the old RS. The Goods of RS. The Not so Goods of RS. Solution to the gauge hierarchy problem. Gauge boson KK modes near IR: large T. Higgs. (t,b) near IR: large anomalous Zbb.

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new ideas in randall sundrum phenomenology

New Ideas in Randall-Sundrum Phenomenology

José Santiago

Theory Group (FNAL)

the goods and the bads of the old rs
The goods and the bads of the old RS

The Goods of RS

The Not so Goods of RS

Solution to the gauge hierarchy problem

Gauge boson KK modes near IR: large T

Higgs

(t,b) near IR: large anomalous Zbb

Fermion masses hierarchical with FCNCnaturally absent for light fermions

the bads of the old rs t parameter
The bads of the old RS: T parameter

Gauge KK modes are localized near the IR brane

Large mixing with the Z and W zero modes through the Higgs

Large T parameter

the bads of the old rs zbb coupling
The bads of the old RS: Zbb coupling

Top (bottom) zero modes are localized near the IR brane

Large gauge and Yukawa couplings to GB and fermion KK modes

Large anomalous Zbb coupling

new ideas custodial symmetry
New Ideas: custodial symmetry
  • Custodial protection of Randall-Sundrum:
    • Bulk Gauge Symmetry:

Agashe, Delgado, May, Sundrum JHEP (03)

new ideas custodial symmetry1
New Ideas: custodial symmetry
  • Custodial protection of Randall-Sundrum:
    • Bulk Gauge Symmetry:

Agashe, Contino, Da Rold, Pomarol ph/0605341

fermion quantum numbers
Fermion Quantum Numbers

The simplest option is bidoublets under

The Higgs is also a bidoublet with

custodial protection of t and zbb
Custodial protection of T and Zbb
  • T and Zbb protected by custodial symmetry broken by b.c. only on the UV brane: Insensitive to UV physics
    • Quantum corrections are calculable
    • T and Zbb do not receive corrections above
  • One loop corrections are typically sizable
    • Triplets contribute negative to T
    • Singlets contribute positive to T
    • Large positive T leads to large positive
quantum corrections to t and zbb
Quantum corrections to T and Zbb

T negative in most of parameter space: RH top almost flat

UV singlet localization IR

Positive T leads to large deviations in Zbb

global fit to electroweak observables
Global Fit to Electroweak Observables
  • We have performed a global fit to all relevant electroweak precision observables including:
    • All tree-level effects at leading order in
    • Leading one loop effects: S and T parameters and Zbb
  • We compute the as a function of the localization parameter of the fermion zero modes:
  • Zbb coupling and the S parameter are the most restrictive observables when the light fermions are near the UV brane
  • Loss of universality when light fermions near the IR brane

Carena, Ponton, J.S., Wagner hep-ph/0612nnn

result of the global fit
Result of the Global Fit

IR light localization UV

S can receive corrections from physics above the UV cut-off

spectrum
Spectrum

First two generation KK modes

Not a necessary prediction

typical spectrum
Typical Spectrum

Third generation KK modes

Solid prediction

collider phenomenology
Collider Phenomenology
  • Tevatron
    • Searches for new quarks
    • Interesting possibilities for Higgs physics
  • LHC
    • discovery up to 1 TeV
    • Exciting Higgs physics
    • Exotic decay channels
conclusions
Conclusions
  • Custodial protection T and Zbb in RS: Light gauge boson KK modes accessible at the LHC
  • T and Zbb are insensitive to UV physics: calculable and relevant
  • Global fit to EW precision observables taking into account all relevant one loop corrections:
  • Light quarks ~ 300-600 GeV accessible at Tevatron and LHC
  • Interesting collider implications:
    • Interesting Higgs physics
    • Exotic decay channels
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