A Mechanism for Kaluza-Klein Number Violation in UED and Implications for LHC
arXiv:0708.3497 · doi:10.1088/0954-3899/35/9/095002
Abstract
If the Higgs does not propagate into an otherwise universal extra dimension, then tree-level Kaluza-Klein number is not conserved in the Yukawa interactions. This leads to mixing between zero-mode fermions and their associated Kaluza-Klein excitations. The effect can be quite large for the top quark, since its mass (171.4 plus or minus 2.1 GeV) is approximately one-half the current Tevatron mass bound (about 350-400 GeV) for Kaluza-Klein excitations of quarks with one universal extra dimension. In contrast to the SM, the bi-unitary transformation that diagonalizes the mass matrix does not diagonalize the effective 4D Yukawa coupling matrix because of the presence of the 5D kinetic terms. This leads to violation of tree-level Kaluza-Klein number conservation in the gauge sector due to a unique feature of the 5D theory. This allows Kaluza-Klein excitations of the fermions to be produced singly, and opens up new decay channels in the gauge sector. We compute the cross section for the production of the lowest-lying Kaluza-Klein excitations of the top and bottom quarks in the non-universal Higgs model at the Large Hadron Collider, and consider their subsequent decays. The effect is quite large: For example, pair production of Kaluza-Klein excitations of the bottom quark will lead to a pair of top quarks plus a pair of charged weak gauge bosons. Since the production is via the strong interaction, such final states stand out well against the Standard Model background, and are observable at the LHC for a wide range of compactification scales. Finally, we discuss the effects that such a model has on the T- parameter, and propose a model with maximal mixing where the compactification scale may be as large as a universal extra dimension.
arXiv comment22 pages, 5 figures; uploaded as a PDF file, thus it will not be available as a PostScript file; version 2 includes a discussion of bounds from the T-parameter, including ways that these bounds may be relaxed, and extension of the range of some figures to 2.4 TeV
References in corpus (51)
- The Hierarchy Problem and New Dimensions at a Millimeter
- The Cosmological Parameters 2006
- Big-Bang nucleosynthesis (Particle Data Group mini-review)
- New Dimensions at a Millimeter to a Fermi and Superstrings at a TeV
- Phenomenology, Astrophysics and Cosmology of Theories with Sub-Millimeter Dimensions and TeV Scale Quantum Gravity
- Bounds on Universal Extra Dimensions
- Weak Scale Superstrings
- Phase Transitions In M-Theory And F-Theory
- Global QCD Analysis and the CTEQ Parton Distributions
- Radiative Corrections to Kaluza-Klein Masses
- Bosonic Supersymmetry? Getting Fooled at the LHC
- The Standard Model from extra dimensions
- Supersymmetry and Electroweak breaking from extra dimensions at the TeV-scale
- Brane Couplings from Bulk Loops
- Electroweak precision measurements and collider probes of the Standard Model with large extra dimensions
- Electroweak and Flavor Physics in Extensions of the Standard Model with Large Extra Dimensions
- Discrimination of Supersymmetry and Universal Extra Dimensions at Hadron Colliders
- The Impact of Universal Extra Dimensions on the Unitarity Triangle and Rare K and B Decays
- Standard Model at Intersecting D5-branes: Lowering the String Scale
- Universal Extra Dimensions and the Higgs Boson Mass
- Effects of SM Kaluza-Klein excitations on electroweak observables
- Exact Standard model Structures from Intersecting D5-Branes
- The Impact of Universal Extra Dimensions on B -> X_s gamma, B -> X_s gluon, B -> X_s mu^+ mu^-, K_L -> pi^0 e^ +e^-, and epsilon'/epsilon
- Universal Extra Dimensions and b -> s gamma
- Probes Of Universal Extra Dimensions at Colliders
- Collider Implications of Universal Extra Dimensions
- Fermi Constants and ``New Physics''
- Direct collider signatures of large extra dimensions
- Resonances from Two Universal Extra Dimensions
- Electroweak Constraints on Extended Models with Extra Dimensions
- Universal Extra Dimensions and the Muon Magnetic Moment
- Looking For TeV-Scale Strings and Extra-Dimensions
- Chiral fermions, orbifolds, scalars and fat branes
- New Signal for Universal Extra Dimensions
- Universal extra dimensions and Z->b bar-b
- Effects of Universal Extra Dimensions on Mixing
- Probing the Nature of Compactification with Kaluza-Klein Excitations at the Large Hadron Collider
- Testing the Nature of Kaluza-Klein Excitations at Future Lepton Colliders
- Kaluza-Klein States of the Standard Model Gauge Bosons: Constraints From High Energy Experiments
- Collider Implications of Kaluza-Klein Excitations of the Gluons
- Fat Brane Phenomena
- Improved Bounds on Universal Extra Dimensions and Consequences for LKP Dark Matter
- Universal Extra Dimensions at the e-e- Colliders
- The Phenomenology of Universal Extra Dimensions at Hadron Colliders
- Effects Of Kaluza-Klein Excited W On Single Top Quark Production At Tevatron
- Asymmetrical large extra dimensions
- Chiral fermions and gauge-fixing in five-dimensional theories
- Universal Extra Dimensions and Kaluza Klein Bound States
- Monojet and Single Photon Signals from Universal Extra Dimensions
- The Little Hierarchy in Universal Extra Dimensions
- Collider Implications of a Non-Universal Higgs