Article
Bounding the Number of Light Neutrinos Species in a LeftRight Symmetric Model
03/2007;
Source: arXiv

Article: Limits on the Electromagnetic and Weak Dipole Moments of the TauLepton in E_6 Superstring Models
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ABSTRACT: We obtain limits on the electromagnetic and weak dipole moments of the taulepton in the framework of a LeftRight symmetric model (LRSM) and a class of $E_6$ inspired models with an additional neutral vector boson $Z_\theta$. Using as an input the data obtained by the L3 and OPAL Collaborations for the reaction $e^+e^\to \tau^+\tau^\gamma$, we get a stringent limit on the LRSM mixing angle $\phi$, $1.66\times 10^{3}< \phi<1.22\times 10^{3}$, which in turn induces bounds on the tau weak dipole moments which are consistent with the bounds obtained recently by the DELPHI and ALEPH Collaborations from the reaction $e^+e^\to \tau^+\tau^$. We also get similar bounds for the weak dipole moments of the tau lepton in the framework of $E_6$ superstring models.International Journal of Modern Physics A 12/2006; · 1.13 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: In this work the neutralcurrent scattering crosssection for neutrinos on electrons is calculated assuming that a massive Dirac neutrino is characterized by a phenomenological parameters, a charge radius langler2rangle and the righthanded currents are present in the framework of a LeftRight symmetric model (LR). Using the CHARM II result for the charge radius of the muonneutrino langler2rangle < 6.0 × 1033 cm2, we place a bound on 7.9 × 1033 cm2 <= langr2rangleLR <= 7.9 × 1033 cm2. We discuss the relationship between the electron neutral couplings gveV and gveA and the LR model parameters.Journal of Physics Conference Series 11/2013; 468(1):2004.  [Show abstract] [Hide abstract]
ABSTRACT: Theoretical consistency of the 331 model with righthanded neutrinos demands that the number of family of fermions be exactly equal to three. In this brief report we show that such theoretical requirement results in a clean and severe bound on the Z–Z′ mixing angle: 3.979×103<ϕ<1.309×104 with 90% CL.Modern Physics Letters A 11/2011; 23(40). · 1.11 Impact Factor
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