Physics beyond the Standard Model

µ −e conversion in a model of electroweak scale right-handed neutrino mass. We perform a detailed analysis of the µ − e conversion within an extended version of the standard model (SM) with mirror symmetry and low energy of the electroweak scale of the type I seesaw neutrino mass generation. After a brief introduction to the model, we derive the µ − e conversing ratio at one-loop approximation, in which the running inside are W gauge boson or singly charged scalars accompanying with neutrinos, and neutral scalars with new leptons.

14p dianmotminh02 03-05-2024 5 2   Download

Part 2 book "Introduction to nuclear and particle physics" includes content: Properties and interactions of elementary particles, symmetries, discrete transformations, neutral kaons, oscillations, and CP violation, formulation of the standard model, standard model and confrontation with data, beyond the standard model.

194p muasambanhan06 03-02-2024 1 0   Download

We study the FCNC problems in 3-4-1-1 model in a way different from the previous work. The sources of FCNC at the tree-level in the 3-4-1-1 model come from both the gauge and scalar sectors. We show that the most stringently bound on the tree-level FCNC interactions comes from the meson oscillations.

12p vispiderman 15-06-2023 4 2   Download

We investigate the branching ratio of the radiative decay b → sγ in the 3-4-1-1 model with arbitrary charge parameters p,q. If the spontaneous breaking of the gauge group symmetry down to the electroweak group is around a few TeVs, the predictions for the branching ratio Br(b → sγ) and meson mixing are consistent with experimental constraints.

12p vispiderman 15-06-2023 5 2   Download

We present full electroweak radiative corrections to ݁e+ e- ZH with the initial beam polarizations at the International Linear Collider (ILC). The calculation is checked numerically by using three consistency tests that are ultraviolet finiteness, infrared finiteness, and gauge parameter independence.

12p danhvi10 22-11-2018 25 1   Download

Lepton flavor violating (cLFV) decays of charged leptons such as τ → µγ, τ → eγ, µ → eγ,..., are now the subjects of experiments as signals of new Physics beyond the Standard Model (SM). In the limit of the unitary gauge, we prove that contributions from one loop corrections to the above decays are very small in the framework of the economical 3-3-1 model.

13p thuyliebe 09-10-2018 32 2   Download

We show that the mass matrix of electrically neutral gauge bosons in the recent proposed model based on SU(3)C ⊗ SU(3)L ⊗ U(1)X group with three neutrino singlets [9] has two exact eigenvalues and corresponding eigenvectors. Hence the neutral non-Hermitian gauge boson X0 µ is properly determined. With extra vacuum expectation values of the Higgs fields, there are mixings among charged gauge bosons W± and Y ± as well as among neutral gauge bosons Z,Z 0 and X0 .

11p thuyliebe 09-10-2018 41 1   Download

Neutrino masses and mixing in an extended standard model acquiring an A4 flavor symmetry are considered. The corresponding three-neutrino mixing matrix obtained via a perturbative method allows us to determine the Dirac CP violation phase (δCP) as a function of the mixing angles (θ12,θ23,θ13). Then, numerical values and distributions of δCP are given. The latter values are quite close to the global fits of the experimental data for both the normal ordering and inverse ordering of the neutrino masses.

10p thuyliebe 08-10-2018 33 1   Download

However, inflation is just the cosomological paradigm, not a theory! The known field-theoretical mechanisms of inflation use a slow-roll scalar field φ (called inflaton) with proper scalar potential V(φ) (12; 13). The scale of inflation is well beyond the electro-weak scale, ie. is well beyond the Standard Model of Elementary Particles! Thus the inflationary stage in the early universe is the most powerful High-Energy Physics (HEP) accelerator in Nature (up to 1010 TeV).

0p lulaula 25-10-2012 34 3   Download