Location of Repository

Flavour physics in the soft wall model

By Paul R Archer, Stephan J Huber and Sebastian Jager


We extend the description of flavour that exists in the Randall-Sundrum (RS) model to the soft wall (SW) model in which the IR brane is removed and the Higgs is free to propagate in the bulk. It is demonstrated that, like the RS model, one can generate the hierarchy of fermion masses by localising the fermions at different locations throughout the space. However, there are two significant differences. Firstly the possible fermion masses scale down, from the electroweak scale, less steeply than in the RS model and secondly there now exists a minimum fermion mass for fermions sitting towards the UV brane. With a quadratic Higgs VEV, this minimum mass is about fifteen orders of magnitude lower than the electroweak scale. We derive the gauge propagator and despite the KK masses scaling as m2n∼n, it is demonstrated that the coefficients of four fermion operators are not divergent at tree level. FCNC's amongst kaons and leptons are considered and compared to calculations in the RS model, with a brane localised Higgs and equivalent levels of tuning. It is found that since the gauge fermion couplings are slightly more universal and the SM fermions typically sit slightly further towards the UV brane, the contributions to observables such as ϵK and ΔmK, from the exchange of KK gauge fields, are significantly reduced

Topics: QC0793
Publisher: Springer
Year: 2011
OAI identifier: oai:sro.sussex.ac.uk:41356

Suggested articles



  1. (2009). A common origin for neutrino anarchy and charged hierarchies,
  2. (1999). A large mass hierarchy from a small extra dimension,
  3. (1999). An alternative to compactification,
  4. Avoiding the dangers of a soft-wall singularity, arXiv:1105.3390 [INSPIRE].
  5. Bulk fermions in soft wall models, AIP Conf.
  6. (2009). Bulk fermions in warped models with a soft wall,
  7. (2000). Bulk fields and supersymmetry in a slice of AdS,
  8. (2009). Combining direct & indirect kaon CP-violation to constrain the warped KK scale,
  9. (2001). Comments on the holographic picture of the Randall-Sundrum model,
  10. (2009). Composite Higgs-mediated FCNC,
  11. (1960). Confluent hypergeometric functions,
  12. (2008). Correlations among new CP-violating effects in
  13. (2000). Curvature singularities: the good, the bad and the naked,
  14. (2008). Electroweak breaking on a soft wall,
  15. Excited mesons and quantization of string endpoints,
  16. (2009). Fermion flavor in soft-wall AdS,
  17. (2009). Fermion mass hierarchy from the soft wall,
  18. (2001). Fermion masses, mixings and proton decay in a Randall-Sundrum model,
  19. (2000). Flavor changing effects in theories with a heavy Z ′ boson with family nonuniversal couplings,
  20. (2008). Flavor physics in the Randall-Sundrum model: I. Theoretical setup and electroweak precision tests,
  21. (2010). Flavor physics in the Randall-Sundrum model: II. Tree-level weak-interaction processes,
  22. (2005). Flavor structure of warped extra dimension models,
  23. (2003). Flavor violation and warped geometry,
  24. (2009). Flavor violation tests of warped/composite SM in the two-site approach,
  25. (2009). Flavour changing neutral current constraints from Kaluza-Klein gluons and quark mass matrices in RS1,
  26. (1964). Handbook of mathematical functions with formulas graphs and mathematical tables, ninth Dover printing, tenth GPO printing edition,
  27. (2009). Higgs mediated FCNC’s in warped extra dimensions,
  28. (2010). Higgs-mediated FCNCs: natural flavour conservation vs. minimal flavour violation,
  29. Highly excited hadrons
  30. (2001). Holography and phenomenology,
  31. (2006). K0-K¯0 mixing beyond the standard model and CP-violating electroweak penguins in quenched QCD with exact chiral symmetry,
  32. (2006). Linear confinement and AdS/QCD,
  33. (2001). Master formulae for ∆F = 2 NLO QCD factors in the standard model and beyond,
  34. (1999). Modulus stabilization with bulk fields,
  35. (2000). Neutrino masses and mixings in nonfactorizable geometry,
  36. (2009). observables and fine-tuning in a warped extra dimension with custodial protection,
  37. (2009). On the consistency between the observed amount of CP-violation in the K− and Bd-systems within minimal flavor violation,
  38. (2010). On the stability of a soft-wall model,
  39. (2008). operators and the scale of new physics,
  40. (2010). Particle Data Group collaboration, K. Nakamura et al., Review of particle physics,
  41. (1107). Phenomenology of non-custodial warped models,
  42. (2008). Possible indications of new physics in Bd-mixing and in sin(2β) determinations,
  43. (2006). Probing the Randall-Sundrum geometric origin of flavor with lepton flavor violation,
  44. (1997). QCD corrections to flavor changing neutral currents in the supersymmetric standard model,
  45. (2001). Quantum field theory and unification
  46. (2001). Randall-Sundrum models and the regularized AdS/CFT correspondence,
  47. (2010). Search for lepton flavor violating τ decays into three leptons with 719 million produced τ+τ− pairs,
  48. (2010). Soft-wall stabilization,
  49. Stability of scalar fields
  50. (2011). Suppressing electroweak precision observables in 5D warped models,
  51. (2010). Suppressing lepton flavour violation in a soft-wall extra dimension,
  52. (2007). Table of integrals, series and products, seventh edition, Elsevier,
  53. (1969). The confluent hypergeometric function,
  54. (2008). The flavor of the composite pseudo-Goldstone Higgs,
  55. (1998). The large-N limit of superconformal field theories and supergravity,
  56. (2008). The soft-wall standard model,
  57. (1988). Upper bounds on supersymmetric particle masses,
  58. (2011). Warped electroweak breaking without custodial symmetry,
  59. (2011). Warped universal extra dimensions,

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.