arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1107.4015hep-ex
收藏

Xi_b^0重子的观察

Observation of the Xi_b^0 Baryon

T. Aaltonen

发表信息：
Phys.Rev.Lett.107:102001,2011
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

本文报道了费米实验室对撞机探测器在$\sqrt{s}=1.96$ TeV的$p\bar p$碰撞中，通过衰变链$Ξ^0_b \rightarrow Ξ_c^+ \, π^-$（其中$Ξ_c^+ \rightarrow Ξ^- \, π^+ \, π^+$，$Ξ^- \rightarrow Λ\, π^-$，和$Λ\rightarrow p \, π^-$）对底部奇异重子$Ξ^0_b$的观测结果.观测到$25.3^{+5.6}_{-5.4}$候选者的信号，其由背景波动产生的概率为$3.6 \times 10^{-12}$，对应于6.8高斯标准偏差。测量$Ξ^0_b$质量为$5787.8\pm5.0(\textrm{stat})\pm1.3(\textrm{syst})$ MeV/ $c^2$。此外，通过过程$Ξ^-_b \rightarrow Ξ_c^0 \, π^-$观察到$Ξ^-_b$重子，其中$Ξ_c^0 \rightarrow Ξ^-\, π^+$、$Ξ^- \rightarrow Λ\, π^-$和$Λ\rightarrow p \, π^-$。

英文摘要：

The observation of the bottom, strange baryon $Ξ^0_b$ through the decay chain $Ξ^0_b \rightarrow Ξ_c^+ \, π^-$, where $Ξ_c^+ \rightarrow Ξ^- \, π^+ \, π^+$, $Ξ^- \rightarrow Λ\, π^-$, and $Λ\rightarrow p \, π^-$, is reported using data corresponding to an integrated luminosity of 4.2 fb$^{-1}$ from $p\bar p$ collisions at $\sqrt{s}=1.96$ TeV recorded with the Collider Detector at Fermilab. A signal of $25.3^{+5.6}_{-5.4}$ candidates is observed whose probability of arising from a background fluctuation is $3.6 \times 10^{-12}$, corresponding to 6.8 Gaussian standard deviations. The $Ξ^0_b$ mass is measured to be $5787.8\pm5.0(\textrm{stat})\pm1.3(\textrm{syst})$ MeV/$c^2$. In addition, the $Ξ^-_b$ baryon is observed through the process $Ξ^-_b \rightarrow Ξ_c^0 \, π^-$, where $Ξ_c^0 \rightarrow Ξ^-\, π^+$, $Ξ^- \rightarrow Λ\, π^-$, and $Λ\rightarrow p \, π^-$.

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。

↑