arXiv subjects

F. Perez-Vargas

Publications and source records attributed to F. Perez-Vargas.

2 recordsLinked to original sources

arXiv2008

Constraints on Left-Right Symmetric and $E_6$ Superstring Models from the Number of Light Neutrino Species

Using the experimental value for the rate $R^{LEP} _{exp}=Γ_{inv}/Γ_{l\bar l}=5.942\pm 0.016$, we derive constraints on the number of light neutrino species with the invisible width method in the framework of a left-right symmetric model (LRSM) and a $E_6$ superstring model as a function of their respective mixing angles for the neutral vector gauge bosons. Using the above LEP result we get the constraints $-1.6\times 10^{-3}\leqϕ\leq 1.1\times 10^{-3}$ and $-1.3\times 10^{-2}\leqϕ_{E_6} \leq 0.4\times 10^{-2}$, which are stronger than those obtained in previous studies of these models.

hep-ph↗

arXiv2007

Bounding the Number of Light Neutrinos Species in a Left-Right Symmetric Model

Using the experimental values for the rates $R^{LEP} _{exp}=Γ_{inv}/Γ_{l\bar l}=5.942\pm 0.016$, $R^{Giga-Z_1}=Γ_{inv}/Γ_{l\bar l}=5.942\pm 0.012$ (most conservative) and $R^{Giga-Z_1}=Γ_{inv}/Γ_{l\bar l}=5.942\pm 0.006$ (most optimistic) we derive constraints on the number of neutrinos light species $(N_ν)_{LRSM}$ with the invisible width method in the framework of a left-right symmetric model (LRSM) as a function of the LR mixing angle $ϕ$. Using the LEP result for $N_ν$ we may place a bound on this angle, $-1.6\times 10^{-3}\leqϕ\leq 1.1\times 10^{-3}$, which is stronger than those obtained in previous studies of the LRSM.

hep-ph↗