New Physics in the Third Family and its Effect on Low Energy Data

Abstract

We investigate, in detail, a model in which the third family fermions are subjected to an SU(2) dynamics different from the first two families. Constrained by the precision Z-pole data, the heavy gauge boson mass is bounded from below to be about 1.7 TeV at the $2\sigma$ level. The flavor-changing neutral current (FCNC) in the lepton sector can be significant in $\tau \leftrightarrow e$ and $\tau \leftrightarrow \mu$ transitions. In the latter case, the ratio $Br(\tau \to \mu \overline{{\nu }_{\mu }}{\nu }_{\tau })/Br(\tau \to e\overline{{\nu }_e}{\nu }_{\tau })$ and $Br(\tau \to \mu \mu \mu )$ can constrain the model better than LEP/SLC data in some region of the parameter space. Furthermore, FCNCs are unavoidable in the quark sector. Significant effects to the $B^0-\overline{B^0}$ mixing and the rare decays of the K and B mesons, such as $K^{\pm }\to {\pi }^{\pm }\nu \bar{\nu }$, $b\to s\nu \bar{\nu },B_s\to {\tau }^{+}{\tau }^{-},{\mu }^{+}{\mu }^{-}$ and $B_{s,d}\to {\mu }^{\pm }{\tau }^{\mp }$, are expected.

42 pages, Latex, 2 ps figures

Cited by in corpus (29)

• Single Top Production as a Window to Physics Beyond the Standard Model
• The Higgs Mass Bound in Gauge Extensions of the Minimal Supersymmetric Standard Model
• Top quark forward-backward asymmetry at the Tevatron: a comparative study in different new physics models
• Fully differential W' production and decay at next-to-leading order in QCD
• Testing the Nature of Kaluza-Klein Excitations at Future Lepton Colliders
• Electroweak Limits on Non-Universal Z' Bosons
• Finding Z' bosons coupled preferentially to the third family at CERN LEP and the Fermilab Tevatron
• The $Z\to b\bar{b}$ Decay Asymmetry and Left-Right Models
• Search for high-mass resonances decaying into tau-lepton pairs in pp collisions at sqrt(s) = 7 TeV
• Proton Lifetime and Baryon Number Violating Signatures at the LHC in Gauge Extended Models
• $A_{FB}^b$ and $R_b$ at LEP and New Right-Handed Gauge Bosons
• Production of Z'-Boson Resonances with Large Width at the LHC
• En-gauging Naturalness
• Probing topcolor-assisted technicolor from top charge asymmetry and triple-top production at the LHC
• Unparticle Physics and A_{FB}^b on the Z pole
• A Heavy Higgs and a Light Sneutrino NLSP in the MSSM with Enhanced SU(2) D-terms
• Unitarity violation of the CKM matrix in a nonuniversal gauge interaction model
• Limitations of B-meson mixing bounds on technicolor theories
• Lepton flavour violation in a nonuniversal gauge interaction model
• Non-universal gauge boson $Z^{\prime }$ and the spin correlation of top quark pair production at $e^{-}{e}^{+}$ colliders
• Early LHC bound on W' boson in the nonuniversal gauge interaction model
• Direct search for heavy gauge bosons at the LHC in the nonuniversal SU(2) model
• The TopFlavor scheme in the context of $W^{\prime }$ searches at LHC
• Constraining $Z^{\prime }$ widths from $p_T$ measurements in Drell-Yan processes
• Probing topcolor-assisted technicolor models from like-sign tau pair production in e gamma collisions
• A Light Sterile Neutrino in the TopFlavor Model
• Implications of LEP/SLD Data for New Physics in Zbb_bar Couplings
• Neutrino Oscillations Due to Nonuniversal Gauge Interactions in the Weak Sector
• Complementarity of Forward-Backward Asymmetry for discovery of Z' bosons at the Large Hadron Collider