arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1101.2887hep-phhep-ex
收藏

来自Kl3的Kpi矢量形状因子和约束衰减

The Kpi vector form factor and constraints from Kl3 decays

Diogo R. Boito, Rafel Escribano, Matthias Jamin

摘要:

$Kπ$矢量形状因子$F_+^{Kπ}$的斜率和曲率参数与$\tauKpi$和$K_{l3}$衰变的数据拟合,得到$λ_+'=(25.49 \pm 0.31) \times 10^{-3}$和$λ_+"= (12.22 \pm 0.14) \times 10^{-4}$。发现$K^*(892)^\pm$的极位置在$m_{K^*(892)^\pm}= 892.0\pm 0.5$ MeV和$Γ_{K^*(892)^\pm}= 46.5 \pm1.1$ MeV。计算了与$K_{l3}$分析有关的相空间积分和$P$波同位旋1/2 $Kπ$相移阈值参数。

英文摘要:

The slope and curvature parameters of the $Kπ$ vector form factor, $F_+^{Kπ}$, are fitted to the data on $\tauKpi$ and $K_{l3}$ decays yielding $λ_+'=(25.49 \pm 0.31) \times 10^{-3}$ and $λ_+"= (12.22 \pm 0.14) \times 10^{-4}$. The pole position of the $K^*(892)^\pm$ is found to be at $m_{K^*(892)^\pm}= 892.0\pm 0.5$ MeV and $Γ_{K^*(892)^\pm}= 46.5 \pm1.1$ MeV. The phase-space integrals relevant for $K_{l3}$ analyses and the $P$-wave isospin-1/2 $Kπ$ phase-shift threshold parameters are also calculated.

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。

↑