τ-جبرها، τ-ابرجبرها و برخی خواص آن ها

→ τ + τ − at the threshold and beyond

The excitation curve for the τ τ− production in electron positron annihilation near the threshold is revisited with the aim of updating and extending a previous work. We find that the corrections of the relative magnitude O(α) near the threshold are significantly contributed by the radiative modification of the Coulomb interaction between the τ leptons. The interpolation between the Coulomb eff...

Rare Radiative B → Τ + Τ − Γ Decay

The radiative B → τ + τ − γ decay is investigated in the framework of the Standard Model. When only short (short and long together) distance contributions are taken into account, the Branching Ratio is found as 9.54 × 10 −9 (1.52 × 10 −8), for the value of the cut δ = 0.01 imposed on the photon energy.

Effect of H ± on B ± → τ ± ν τ and D ± s → μ ± ν μ , τ ± ν τ

The recent observation of the purely leptonic decay B → τντ at the B factories permits a sizeable contribution from a charged Higgs boson (H). Such a H would also contribute to the decays D s → μ νμ and D ± s → τ ντ , which are being measured with increasing precision at CLEO-c. We show that the branching ratios of D s → μ νμ and D s → τ ντ could be suppressed by up to 10% from the Standard Mod...

Transverse spin effects in H / A → τ + τ − ; τ ± → νX ± , Monte Carlo approach †

The Τ - Polarisation Test for the H / a → Τ + Τ − Signal at the Lhc

The correlation between the two τ-polarisations is predicted to be opposite (+ − / − +) for the H/A → τ + τ − signal, while it corresponds to the same sign combinations for the Drell-Yan (+ + / − −) and t ¯ t (−−) backgrounds. We show that this correlation can serve as a distinctive test to confirm the presence of the MSSM Higgs bosons H and A in their hadronic τ + τ − decay channels at the LHC.

Violation in the Cabbibo - suppressed Decay τ → Kπν τ with Polarized τ Leptons

CP violation from physics beyond the Standard Model (SM) is investigated in the Cabbibo-suppressed decay τ → Kπν τ with polarized τ leptons, to which both the J P = 1 − resonance K * and the J P = 0 + resonance K * 0 contribute. In addition to the CP-odd rate asymmetry, τ polarization enables us to construct three additional CP-odd polarization asymmetries that can be enhanced due to the interf...