arXiv 1410.44092014-10hep-ex

在ATLAS的$π^+ π^- Υ(1 \rm S)$通道中搜索$X_b$和其他隐藏的美丽状态

Search for the $X_b$ and other hidden-beauty states in the $π^+ π^- Υ(1 \rm S)$ channel at ATLAS

ATLAS Collaboration

备注：: 8 pages plus author list + cover pages (20 pages total), 4 figures, 0 tables, submitted to Physics Letters B, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2013-07/
发表信息：: Physics Letters B 740 (2015), 199-217
DOI：: 10.1016/j.physletb.2014.11.055

摘要：

这封信介绍了在$X_b \to π^{+} π^{-} Υ(1 \rm S)(\rightarrowμ^+μ^-)$通道中，利用在大型强子对撞机上ATLAS探测器收集的$\sqrt{s}=8$ TeV $pp$碰撞数据中的16.2 fb $^{-1}$，在10.05- 10.31 GeV和10.40- 11.00 GeV的质量范围内寻找$X(3872)$的隐美对应物。没有发现新的狭窄状态的证据，并在$X_b$横截面和分支分数的乘积上设定上限，相对于$Υ(2 \rm S)$，在95%置信水平下使用CL $_S$方法。这些限值范围为0.8%至4.0%，取决于质量。对于10.1 GeV以上的质量，这项分析的预期上限是迄今为止最严格的。对产生$Υ(1^3 \rm{D}$ $_J)$、$Υ(10860)$和$Υ(11020)$状态的检测也没有显示出显著的信号。

英文摘要：

This Letter presents a search for a hidden-beauty counterpart of the $X(3872)$ in the mass ranges 10.05--10.31 GeV and 10.40--11.00 GeV, in the channel $X_b \to π^{+} π^{-} Υ(1 \rm S)(\rightarrowμ^+μ^-)$, using 16.2 fb$^{-1}$ of $\sqrt{s}=8$ TeV $pp$ collision data collected by the ATLAS detector at the LHC. No evidence for new narrow states is found, and upper limits are set on the product of the $X_b$ cross section and branching fraction, relative to those of the $Υ(2 \rm S)$, at the 95% confidence level using the CL$_S$ approach. These limits range from 0.8% to 4.0%, depending on mass. For masses above 10.1 GeV, the expected upper limits from this analysis are the most restrictive to date. Searches for production of the $Υ(1^3 \rm{D}$$_J)$, $Υ(10860)$, and $Υ(11020)$ states also reveal no significant signals.

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。

摘要：

英文摘要：

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