Unparticle引起的轻子味破坏衰变

Unparticle-Induced Lepton Flavor Violating Decays

在Unparticle物理模型下讨论了轻子味破坏(LFV)衰变τ-→l-(V0,P0)(其中l=e,μ,V0(P0)代表中性矢量介子和赝标介子).首先提出了Unparticle物理与标准模型粒子有效相互作用模型,然后详细计算了τ-→l-(V0,P0)的衰变宽度和分支比,系统分析了所有相关实验对耦合常数限制,并给出了适当的参数空间.结果表明:在确定参数空间内,τ→lP0衰变模式具有很小的分支比,在实验上无法观测到;而在许多参数与空间内,τ→lV0衰变模式的分支比具有量级O(10-10～10-8),这在将来的LHC和超B工厂是可以观测的.

The lepton flavor violating （LFV） decays τ-→l-（V0,P0） （ l=e,μ,V0（P0） is a neutral light vector （pseudo-scalar） meson） are discussed in the framework of Unparticle physics, using an effective coupling model Unparticle interactions, we calculate the decay widths and Branching ratios of the τ-→l-（V0,P0） in details. The constraints are investigated systematically on the related coupling parameters from all the available experimental data, and the parameter values are specified appropriately. The results show that whereas over the whole parameter space allowed by experiments all the τ→lP0 modes have a branching ratio too small to be measurable experimentally, in a large subspace as observed all of the τ→lP0 modes get simultaneously a branching ratio as high as O（ 10^-10～10^-8）, which is reachable at the LHC and super B factory.