arXiv subjects

Liao Wei

Publications and source records attributed to Liao Wei.

7 recordsLinked to original sources

arXiv2002

Weak Mixing Angle and the SU(3)_C times SU(3) Model on M^4 times S^1/(Z_2 times Z_2')

We show that the desirable weak mixing angle sin^2 theta_W = 0.2312 at m_Z scale can be generated naturally in the SU(3)_C times SU(3) model on M^4 times S^1 / (Z_2 times Z_2') where the gauge symmetry SU(3) is broken down to SU(2)_L times U(1)_Y by orbifold projection. For a supersymmetric model with a TeV scale extra dimension, the SU(3) unification scale is about hundreds of TeVs at which the gauge couplings for SU(3)_C and SU(3) can also be equal in the mean time. For the non-supersymmetric model, SU(2)_L times U(1)_Y are unified at order of 10 TeV. These models may serve as good candidates for physics beyond the SM or MSSM.

hep-ph↗

arXiv2001

Search for new physics via CP violation in $B_{d,s} \to l^+ l^-

It is shown that in the approximation of $|\frac{q}{p}|$=1 the CP violation in $B^0_{d,s} \to l^+ l^-$ decays vanishes in SM. In a 2HDM with CP violating phases and MSSM the CP asymmetries depend on the parameters of models and can be as large as 40% for $B^0_d$ and 3% for $B^0_s$. An observation of CP asymmetry in the decays would unambiguously signal the existence of new physics.

hep-ph↗

arXiv2001

CP Violation and Extra Dimensions

It is shown that the new sources of CP violation can be generated in the models with more than one extra dimensions. In the supersymmetric models on the space-time $M^4\times T^2/Z_2$, where the radius moduli have auxiliary vacuum expectation values and the supersymmetry breaking is mediated by the Kaluza-Klein states of gauge supermultiplets, we analyze the gaugino masses and trilinear couplings for two scenarios and obtain that there exist relative CP violating phases among the gaugino masses and trilinear couplings.

hep-ph↗

arXiv2001

Renormalizaion group equations and infrared quasi fixed point behaviors of non-universal soft terms in MSSM

The renormalization group equations(RGEs) of non-universal soft supersymmetric breaking terms with CP violating phases are analyzed in this paper. We obtain the analytic solutions of RGEs by directly solving the RGEs themselves. Compared with the method of spurion expansion our approach proves to be simple and succinct, and easy to extend to the case of complex parameters. With the analytical forms of the solutions we obtained the infrared quasi fixed point behavior of soft terms are analyzed and it turns out to support the notion in scenarios with CP violating phases.

hep-ph↗

arXiv2000

Exclusive semileptonic rare decays $B ->_ ($K,K^*) \ell^+ \ell^- in supersymmetric theories

The invariant mass spectrum, forward-backward asymmetry, and lepton polarizations of the exclusive processes $B\to K(K^*)\ell^+ \ell^-, \ell=μ, τ$ are analyzed under supersymmetric context. Special attention is paid to the effects of neutral Higgs bosons (NHBs). Our analysis shows that the branching ratio of the process $\bkm$ can be quite largely modified by the effects of neutral Higgs bosons and the forward-backward asymmetry would not vanish. For the process $\bksm$, the lepton transverse polarization is quite sensitive to the effects of NHBs, while the invariant mass spectrum, forward-backward asymmetry, and lepton longitudinal polarization are not. For both $\bkt$ and $\bkst$, the effects of NHBs are quite significant. The partial decay widths of these processes are also analyzed, and our analysis manifest that even taking into account the theoretical uncertainties in calculating weak form factors, the effects of NHBs could make SUSY shown up.

hep-ph↗

arXiv2000

The Electric Dipole Moment and CP Violation in $B \to X_s l^+ l^-$ in SUGRA Models with Nonuniversal Gaugino Masses

The constraints of electric dipole moments (EDMs) of electron and neutron on the parameter space in supergravity (SUGRA) models with nonuniversal gaugino masses are analyzed. It is shown that with a light sparticle spectrum, the sufficient cancellations in the calculation of EDMs can happen for all phases being order of one in the small tan$β$ case and all phases but $ϕ_μ$ ($|ϕ_μ| <\sim π/6$) order of one in the large tan$β$ case. This is in contrast to the case of mSUGRA in which in the parameter space where cancellations among various SUSY contributions to EDMs happen $|ϕ_μ|$ must be less than $π/10$ for small $tanβ$ and ${\cal{O}}(10^{-2})$ for large $tanβ$. Direct CP asymmetries and the T-odd polarization of lepton in $B\to X_s l^+l^-$ are investigated in the models. In the large tan$β$ case, $A_{CP}^2$ and $P_N$ for l=$μ$ ($τ$) can be enhanced by about a factor of ten (ten) and ten (three) respectively compared to those of mSUGRA.

hep-ph↗

arXiv2000

Supersymmetric CP Violation in $B \to X_s l^+ l^-$ in Minimal Supergravity Model

Direct CP asymmetries and the CP violating normal polarization of lepton in inclusive decay B \to X_s l^+ l^- are investigated in minimal supergravity model with CP violating phases. The contributions coming from exchanging neutral Higgs bosons are included. It is shown that the direct CP violation in branching ratio, A_{CP}^1, is of {\cal{O}}(10^{-3}) for l=e, μ, τ. The CP violating normal polarization for l=μcan reach 0.5 percent when tanβis large (say, 36). For l=τand in the case of large \tanβ, the direct CP violation in backward-forward asymmetry, A_{CP}^2, can reach one percent, the normal polarization of τcan be as large as a few percent, and both are sensitive to the two CP violating phases, ϕ_μand ϕ_{A_0}, and consequently it could be possible to observe them (in particular, the normal polarization of τ) in the future B factories.

hep-ph↗