论文标题
$ e^{+} e^{ - }的测量
Measurement of $e^{+}e^{-}\rightarrowωπ^{+}π^{-}$ cross section at $\sqrt s = $ 2.000 to 3.080 GeV
论文作者
论文摘要
对该过程的部分波分析$ e^{+} e^{ - } \rightArrowΩπ^{+}π^{ - } $进行使用的647 pb $^{ - 1} $使用BESIII检测器在BEPCII储存环中运行的BESIII检测器在Bepcii of Center-Center Of-Mass（C.M.MASS（C.M.）c.m. M.）c.m. M. gove vev cove的数据样本中收集的数据样本的数据样本。 $ e^{+} e^{ - } \rightArrowΩπ^{+}π^{ - } $过程的出生横截面被测量，与以前的研究相比，精度提高了3倍。在$ e^{+} e^{+} e^{ - } \toΩπ^{+}π^{ - } $和$ωπ^{0}π^{0} $ 223 $ 2232 $ 2232 $ 2232222222222222222222222222222222222222222222222222222 $ 27的统计学意义的22322222222222的Mev $/c^{2} $和93 $ \ pm $ 53 $ \ pm $ 20 MEV，其中第一个和第二个不确定性分别是统计和系统的。通过分析子处理的横截面$ e^{+} $ b_ {1}（1235）π$，一种结构，质量M = 2200 $ \ pm $ 11 $ \ pm $ \ pm $ 17 mev/$ c^2 $和width $γ$ = 74 $ \ pm $ \ pm 20 $ \ pm $ 24 mev，被观察到以7.9 $σ$ 7.9 $ f的统计意义。测得的谐振参数将有助于揭示2.25 GEV左右的向量状态的性质。
A partial wave analysis on the process $e^{+}e^{-}\rightarrowωπ^{+}π^{-}$ is performed using 647 pb$^{-1}$ of data sample collected by using the BESIII detector operating at the BEPCII storage ring at center-of-mass (c.m.) energies from 2.000 GeV to 3.080 GeV. The Born cross section of the $e^{+}e^{-}\rightarrowωπ^{+}π^{-}$ process is measured, with precision improved by a factor of 3 compared to that of previous studies. A structure near 2.25 GeV is observed in the energy-dependent cross sections of $e^{+}e^{-}\toωπ^{+}π^{-}$ and $ωπ^{0}π^{0}$ with a statistical significance of 7.6$σ$, and its determined mass and width are 2232 $\pm$ 19 $\pm$ 27 MeV$/c^{2}$ and 93 $\pm$ 53 $\pm$ 20 MeV, respectively, where the first and second uncertainties are statistical and systematic, respectively. By analyzing the cross sections of subprocesses $e^{+}e^{-}\rightarrow ωf_{0}(500)$, $ωf_{0}(980)$, $ωf_{0}(1370)$, $ωf_{2}(1270)$, and $b_{1}(1235)π$, a structure, with mass M = 2200 $\pm$ 11 $\pm$ 17 MeV/$c^2$ and width $Γ$ = 74 $\pm$ 20 $\pm$ 24 MeV, is observed with a combined statistical significance of 7.9$σ$. The measured resonance parameters will help to reveal the nature of vector states around 2.25 GeV.
