arXiv subjects

R. Huerta

Publications and source records attributed to R. Huerta.

25 records · Page 2Linked to original sources

arXiv1998

Quark Mixing Possibilities in Extensions of the Standard Model and the Electromagnetic Current

The existence of new quarks may lead to their mixing with ordinary quarks. We are particularly interested in studying the consequences such mixings could have upon the electromagnetic current. We find that new strong flavor and parity violating electromagnetic interactions may exist. To be specific, for our analysis we work with the model: $SU_2 \otimes U_1 \otimes \hat{SU}_2 \otimes \hat{U}_1$, which doubles the standard electroweak sector, both in gauge bosons and in quarks.

hep-ph↗

arXiv1998

Semileptonic decays, magnetic moments and spin distributions of spin-1/2 baryons with sea contribution

Spin-1/2 baryons are considered as a composite system made out of a "core" of three quarks surrounded by a "sea" (of gluons and $q\bar{q}$-pairs) which is specified by its total quantum numbers. Specifically, we assume this sea to be a flavor octet with spin-0 or 1 but no color. We show our model can provide very goods fits to magnetic moments and semileptonic decay data using experimental errors. The predictions for spin distributions are in reasonable agreement with experiment.

hep-ph↗

arXiv1998

Scalar Sea Contributions to Spin 1/2 Baryon Structure and Magnetic Moments

We treat the baryon as a composite system made out of a "core" of three quarks (as in the standard quark model) surrounded by a "sea" (of gluons and $q\bar{q}$-pairs) which is specified by its total quantum numbers like flavor, spin and color. Specifically, we assume the sea to be a flavor octet with spin 0 but no color. The general wavefunction for spin 1/2 baryons with such a sea component is given and an application to the magnetic moments is considered. Numerical analysis shows that the scalar sea can provide a good fit to the magnetic moment data using experimental errors.

hep-ph↗

arXiv1998

A Priori Mixed Baryons and Weak Radiative Decays

A priori mixings of eigenstates in physical states are quantum mechanical effects well known in several realms of physics. The possibility that such effects are also present in particle physics, in the form of flavor and parity mixings, is studied. An application to weak radiative decays of hyperons is discussed. It is suggested that this scheme may also be present in non-leptonic and rare mode decays as the enhancement phenomenon.

hep-ph↗

arXiv1996

The Number of Neutrinos and the Left-Right Symmetric Model

The meaning of $N_ν$ in the Left-Right Symmetric Model (LRSM) is discussed. In its original definition $N_ν$ is the number of neutrinos or generations of leptons, so, in the Standard Model its value is three. However the determination of $N_ν$ in experiments and in astrophysical observations is subject to different theoretical interpretations. We present arguments that gives $N_ν$ as a parameter of the LRSM. Using an experimental value for the rate $Gamma_{inv}/Gamma_{l\bar{l}}$ we calculate the bound $2.90\leq N_{ν_LR}\leq 3.04$ (90 % C. L.), where $N_{ν_LR}$ is a function of the left-right mixing angle $ϕ$. This range is less restrictive than the one of the standard model.

hep-ph↗

arXiv1996

Sea Contributions to Spin 1/2 Baryon Structure, Magnetic Moments, and Spin Distribution

We treat the baryon as a composite system made out of a \lq\lq core" of three quarks (as in the standard quark model) surrounded by a \lq\lq sea" (of gluons and $q\bar{q}$-pairs) which is specified by its total quantum numbers like flavor, spin and color. Specifically, we assume the sea to be a flavor octet with spin 0 or 1 but no color. The general wavefunction for spin 1/2 baryons with such a sea component is given. Application to the magnetic moments is considered. Numerical analysis shows that a scalar (spin 0) sea with an admixture of a vector (spin 1) sea can provide very good fits to the magnetic moment data {\em using experimental errors}. Our best fit automatically gives $g_A/g_V$ for neutron beta decay in agreement with data. This fit also gives reasonable values for the spin distributions of the proton and neutron.

hep-ph↗

arXiv1995

Update to the Neutrino-Electron Scattering in Left-Right Symmetric Models

In a previous paper we study the neutrino-electron scattering in the framework of a left-right symmetric model (LRSM). Constraints on the LRSM parameters $M_{Z_{2}}$ and $ϕ$ were obtained. Based on new measurements we present an update to these constraints and also include in the calculation the radiative corrections.

hep-ph↗