arXiv subjects

Tai-fu Feng

Publications and source records attributed to Tai-fu Feng.

3 recordsLinked to original sources

arXiv2000

The minimum supersymmetric standard model without R-parity through various lepton-number violations

The minimum supersymmetric standard model (MSSM) without R-parity through various lepton-number violations is investigated systematically. All kinds of possible mixing in the model are formulated precisely. The remarkable issue that the lightest `Higgs' $H_1^0$ may be heavier than the weak-boson $Z$ at tree level is kept, as the special R-parity violation MSSM where only bilinear violation of the lepton numbers is allowed. It is also shown explicitly that there is a freedom $U(n+1)$ ($n$ is the number of the broken lepton-numbers) in re-defining the lepton and Higgs superfields. Feynman rules relevant to the R-parity violations are given precisely in $'$t Hooft-Feynman gauge. With further assumptions and concerning all available experimental constraints, spectrum for interest sectors is computed numerically.

hep-ph↗

arXiv1999

A supersymmetry extension of the standard model with bilinear R parity violation

The minimum supersymmetric standard model with bilinear R-parity violation is studied systematically. Considering low-energy supersymmetry, we examine the structure of the bilinear R-parity violating model carefully. We analyze the mixing such as Higgs bosons with sleptons, neutralinos with neutrinos and charginos with charged leptons in the model. Possible and some important physics results such as the lightest Higgs may heavy than the weak Z-boson at tree level etc are obtained. The Feynman rules for the model are derived in $'$t Hooft- Feynman gauge, which is convenient if perturbative calculations are needed beyond the tree level.

hep-ph↗

arXiv1999

Rare B Decays in Supersymmetry without R-parity

We perform the complete computation of the contributions to $b\to s+γ, b\to s e^{+}e^{-}, b\to s\sum ν_{i} \barν_{i}$ in supersymmetric model with bilinear R-parity violation. We compare our calculations with the evaluations in SM and the experimental results. We find that the supersymmetric contributions can be quite large in those processes. From the analysis and experimental results, we can get some constraints on the mass spectrum in the model.

hep-ph↗