arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0709.3435hep-ph
收藏

非粒子物理中轻子味违反$μ\to eγ$和$μ-e$转换

Lepton flavor violating $μ\to eγ$ and $μ-e$ conversion in unparticle physics

Gui-Jun Ding, Mu-Lin Yan

摘要:

本文研究了非粒子诱导的轻子味破坏过程$μ\to eγ$和$μ-e$转换。${\rm Br}(μ\to eγ)$和$μ-e$的转化率${\rm CR}(μ-e,{\rm Nuclei})$都强烈地依赖于尺度维数$d_{\cal U}$和非粒子耦合$λ^{ff'}_{\rm K}$(K = V,A,S,P)。目前关于${\rm Br}(μ\to eγ)$、${\rm CR}(μ-e,{\rm Ti})$和${\rm CR}(μ-e,{\rm Au})$的实验上界对非粒子物理的参数提出了严格的限制。2左右的尺度$d_{\cal U}$有利于${\cal O}(10 {\rm TeV})$的非粒子尺度$Λ_{\cal U}$和${\cal O}(10^{-3})$的非粒子耦合。对于非粒子费米子和SM费米子之间的纯矢量耦合和纯标量耦合,${\rm CR}(μ-e,{\rm Nuclei})$与$\rm{Z^4_{eff}A^2/Z}$成正比,这种特殊的原子数依赖性可以用来区分非粒子和其他理论模型。

英文摘要:

We have studied lepton flavor violation processes $μ\to eγ$ and $μ-e$ conversion in nuclei induced by unparticle. Both ${\rm Br}(μ\to eγ)$ and $μ-e$ conversion rate ${\rm CR}(μ-e,{\rm Nuclei})$ strongly depend on the scale dimension $d_{\cal U}$ and the unparticle coupling $λ^{ff'}_{\rm K}$(K=V, A, S, P). Present experimental upper bounds on ${\rm Br}(μ\to eγ)$, ${\rm CR}(μ-e,{\rm Ti})$ and ${\rm CR}(μ-e,{\rm Au})$ put stringent constraints on the parameters of unaprticle physics. The scale dimensions $d_{\cal U}$ around 2 are favored for the unparticle scale $Λ_{\cal U}$ of ${\cal O}(10 {\rm TeV})$ and the unparticle coupling of ${\cal O}(10^{-3})$. ${\rm CR}(μ-e,{\rm Nuclei})$ is proportional to $\rm{Z^4_{eff}A^2/Z}$ for the pure vector and scalar couplings between unparticle and SM fermions, this peculiar atomatic number dependence can be used to distinguish unparticle from other theoretical models.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑