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...

The influence of Fe addition on thermal stability, crystallography, and magnetic properties τ-Mn51Al47C2 was investigated. Alloys with composition Mn51-xFexAl47C2 (x = 0, 0.5, 1, 2, 4) were synthesized by mechanical alloying method. High purity τ-Mn(Fe)AlC up to 98% could be obtained after 10 h milling, then annealed at 1050 °C for 1 h, followed an aging process appropriate temperatures from 51...