arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1911.08023hep-ph
收藏

用Bethe-Salpeter方程方法研究罕见的$Λ_b \rightarrow Λl^+ l^- $衰变

Rare $Λ_b \rightarrow Λl^+ l^- $ decay in the Bethe-Salpeter equation approach

Liang-Liang Liu, Xian-Wei Kang, Zhen-Yang Wang, Xin-Heng Guo

摘要:

我们用Bethe-Salpeter方程方法研究了稀有衰变$Λ_b \rightarrow Λl^+ l^-~(l=e,μ, τ)$。我们发现,依赖于我们的模型中的参数值的分支比$Br(Λ_b \rightarrow Λμ^+ μ^-)\times 10^{6}$从$0.812$ $1.445$变化时,$κ= 0.050 \sim 0.060$ GeV $^3$和结合能$E_0=-0.14$ GeV,而$Br(Λ_b \rightarrow Λμ^+ μ^-)\times 10^{6}$从$1.051$ $1.098$变化时,$κ= 0.055$ GeV $^3$和结合能$E_0$从$-0.19$ $-0.09$ GeV。这些结果与实验数据相符。在相同的参数范围内,我们发现分支比$Br(Λ_b \rightarrow Λe^+ e^-(τ^+ τ^-) )\times 10^{6}$分别在$0.660-1.028$($0.252-0.392$)和$0.749-1.098$($0.286-0.489$)范围内变化.

英文摘要:

We study the rare decays $Λ_b \rightarrow Λl^+ l^-~(l=e,μ, τ)$ in the Bethe-Salpeter equation approach. We find that depending on the values of parameters in our model the branching ratio $Br(Λ_b \rightarrow Λμ^+ μ^-)\times 10^{6}$ varies from $0.812$ to $1.445$ when $κ= 0.050 \sim 0.060$ GeV$^3$ and the binding energy $E_0=-0.14$ GeV while $Br(Λ_b \rightarrow Λμ^+ μ^-)\times 10^{6}$ varies from $1.051$ to $1.098$ when $κ= 0.055$ Gev$^3$ and the binding energy $E_0$ changes from $-0.19$ to $-0.09$ GeV. These results agree with the experimental data. In the same parameter regions, we find that the branching ratio $Br(Λ_b \rightarrow Λe^+ e^-(τ^+ τ^-) )\times 10^{6}$ varies in the range $0.660-1.028$ ($0.252-0.392$) and $0.749-1.098$ ($0.286-0.489$), respectively.

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。

↑