Z', new fermions and flavor changing processes, constraints on E${}_6$ models from $\mu$ --> eee

Abstract

We study a new class of flavor changing interactions, which can arise in models based on extended gauge groups (rank $>$4) when new charged fermions are present together with a new neutral gauge boson. We discuss the cases in which the flavor changing couplings in the new neutral current coupled to the $Z^{\prime }$ are theoretically expected to be large, implying that the observed suppression of neutral flavor changing transitions must be provided by heavy $Z^{\prime }$ masses together with small $Z$-$Z^{\prime }$ mixing angles. Concentrating on E${}_6$ models, we show how the tight experimental limit on $\mu \to eee$ implies serious constraints on the $Z^{\prime }$ mass and mixing angle. We conclude that if the value of the flavor changing parameters is assumed to lie in a theoretically natural range, in most cases the presence of a $Z^{\prime }$ much lighter than 1 TeV is unlikely.

plain tex, 22 pages + 2 pages figures in PostScript (appended after `\bye'), UM-TH 92-19

Cited by in corpus (44)

• Flavor Changing Effects in Theories with a Heavy Z' Boson with Family Non-Universal Couplings
• Solution to the B -> pi K Puzzle in a Flavor-Changing Z' Model
• Z' Mediated Flavor Changing Neutral Currents in B Meson Decays
• First limit on inclusive $B\to X_s\nu \bar{\nu }$ decay and constraints on new physics
• An Effective Z'
• B_s-anti-B_s Mixing in Z' Models with Flavor-Changing Neutral Currents
• Single Top-Quark Production in Flavor-Changing Z' Models
• Flavour-Changing Neutral Currents and Leptophobic Z' Gauge Bosons
• Constraints on the nonuniversal Z^\prime couplings from B\toπK, πK^{\ast} and ρK Decays
• New-Physics Effects on Triple-Product Correlations in Lambda_b Decays
• Methods for Measuring New-Physics Parameters in B Decays
• The impact of lepton-flavor violating Z' bosons on muon g-2 and other muon observables
• B -> K1 l^+l^- Decays in a Family Non-universal Z' Model
• Explaining B \to K pi anomaly with non-universal Z' boson
• Lepton flavor violating $\mu \to e\gamma$ and $\mu -e$ conversion in unparticle physics
• Probe a family non-universal Z' boson effects in B(s)-> phi mu(+) mu(-)decay
• A Comprehensive Analysis of Hadronic b->s Transitions in a Family Non-universal Z' Model
• Unconventional superstring derived E${}_6$ models and neutrino phenomenology
• Annihilation-Type Charmless Radiative Decays of B Meson in Non-universal Z^\prime Model
• Effective Lagrangian description of the lepton flavor violating decays Z-->li lj
• Flavor changing neutral currents in 331 models
• Testing the Non-universal Z^\prime Model in Bs -> ϕπ^0 Decay
• The Prediction of Mass of Z'-Boson from $b_q^0-b_q^{0}bar$ Mixing
• Effect of both Z and Z'-mediated flavor-changing neutral currents on the baryonic rare decay $lambd{a}_b$ decays into $lambda{l}^{+}{l}^{-}$
• New Higgs signals induced by mirror fermion mixing effects
• Semileptonic Transition of $Σ_b \rar Σμ^+ μ^-$ in Family Non-universal $Z^{\prime }$ Model
• Implications of Family Nonuniversal $Z^{\prime }$ Model on B -->K_0^* pi Decays
• The Effects of a Family Non-universal Z' Boson in the \bar{B}_s->πK, πK*, ρK Decays and B_d-\bar{B_d} mixing
• Study of the rare decays $B_{s,d}^{\ast }\to {\mu }^{+}{\mu }^{-}$
• Lambda_b -> Lambda l+ l- decay within family non-universal Z' model
• The effects of a family non-universal Z-prime boson on B--->pipi decays
• D-term challenges for supersymmetric gauged abelian flavor symmetries
• Signals of Unconventional E${}_6$ Models at $e^{+}{e}^{-}$ Colliders
• Study of the rare decays $B_{(}s,d{)}^{\ast }$ arrow $l^{+}{l}^{-}$ in Z' model
• Imprints of CP violation asymmetries in rare ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ decay in family non-universal $Z^{\prime }$ model
• The Two Scales of New Physics in Higgs Couplings
• Effect of both Z and Z^prime - mediated flavor-changing neutral currents on $B_s$ decays into $ta{u}^{+}ta{u}^{-}$
• The effect of z^prime boson on same-sign dimuon charge asymmetry in $b_q^0-bar{b}_q^0$ system
• Effects of neutral $Z^{\prime }$ boson in $B_s\to \varphi {\ell }^{+}{\ell }^{-}$ decay with polarized $\varphi$ and the unpolarized and polarized $CP$ violation asymmetry
• Analysis of Angular Observables of ${\Lambda }_b\to \Lambda (\to p\pi ){\mu }^{+}{\mu }^{-}$ Decay in Standard and $Z^{\prime }$ Models
• New physics contributions to ${\bar{B}}_s\to {\pi }^0({\rho }^0){\eta }^{{(}^{\prime })}$ decays
• Split Left-Right Symmetry and Scotogenic Quark and Lepton Masses
• Signals of extra gauge bosons and exotic leptons in SU(6)${}_L\otimes$U(1)${}_Y$
• Hierarchical Quark and Lepton Masses with Sequential U(1) Gauge Symmetry